diff --git a/experimental/babel-preset-env/README.md b/experimental/babel-preset-env/README.md
index d34193086e..f086a7e2d2 100644
--- a/experimental/babel-preset-env/README.md
+++ b/experimental/babel-preset-env/README.md
@@ -96,11 +96,11 @@ For more information on setting options for a preset, refer to the [plugin/prese
 
 ### `targets`
 
-`{ [string]: number }`, defaults to `{}`.
+`{ [string]: number | string }`, defaults to `{}`.
 
 Takes an object of environment versions to support.
 
-Each target environment takes a number (you can also specify a minor versions like `node: 6.5`)
+Each target environment takes a number or a string (we recommend using a string when specifying minor versions like `node: "6.10"`).
 
 Example environments: `chrome`, `opera`, `edge`, `firefox`, `safari`, `ie`, `ios`, `android`, `node`, `electron`.
 
diff --git a/experimental/babel-preset-env/data/built-ins.json b/experimental/babel-preset-env/data/built-ins.json
index 3c91bbf0f4..0109e90976 100644
--- a/experimental/babel-preset-env/data/built-ins.json
+++ b/experimental/babel-preset-env/data/built-ins.json
@@ -1,845 +1,845 @@
 {
   "es6.typed.array-buffer": {
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-    "edge": 13,
-    "firefox": 48,
-    "safari": 10,
-    "node": 6.5,
-    "ios": 10,
-    "opera": 38,
-    "electron": 1.2
+    "chrome": "51",
+    "edge": "13",
+    "firefox": "48",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.typed.data-view": {
-    "chrome": 5,
-    "opera": 12,
-    "edge": 12,
-    "firefox": 15,
-    "safari": 5,
-    "node": 0.12,
-    "ie": 10,
-    "android": 4,
-    "ios": 6,
-    "electron": 0.2
+    "chrome": "5",
+    "opera": "12",
+    "edge": "12",
+    "firefox": "15",
+    "safari": "5",
+    "node": "0.12",
+    "ie": "10",
+    "android": "4",
+    "ios": "6",
+    "electron": "1.1"
   },
   "es6.typed.int8-array": {
-    "chrome": 51,
-    "edge": 13,
-    "firefox": 48,
-    "safari": 10,
-    "node": 6.5,
-    "ios": 10,
-    "opera": 38,
-    "electron": 1.2
+    "chrome": "51",
+    "edge": "13",
+    "firefox": "48",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.typed.uint8-array": {
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-    "edge": 13,
-    "firefox": 48,
-    "safari": 10,
-    "node": 6.5,
-    "ios": 10,
-    "opera": 38,
-    "electron": 1.2
+    "chrome": "51",
+    "edge": "13",
+    "firefox": "48",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.typed.uint8-clamped-array": {
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-    "safari": 10,
-    "node": 6.5,
-    "ios": 10,
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-    "electron": 1.2
+    "chrome": "51",
+    "edge": "13",
+    "firefox": "48",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
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-    "firefox": 48,
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-    "ios": 10,
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-    "electron": 1.2
+    "chrome": "51",
+    "edge": "13",
+    "firefox": "48",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.typed.uint16-array": {
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-    "firefox": 48,
-    "safari": 10,
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-    "ios": 10,
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+    "chrome": "51",
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+    "firefox": "48",
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+    "ios": "10",
+    "opera": "38",
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   },
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-    "electron": 1.2
+    "chrome": "51",
+    "edge": "13",
+    "firefox": "48",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.typed.uint32-array": {
-    "chrome": 51,
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-    "firefox": 48,
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-    "ios": 10,
-    "opera": 38,
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+    "chrome": "51",
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+    "firefox": "48",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.typed.float32-array": {
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+    "chrome": "51",
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+    "firefox": "48",
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+    "opera": "38",
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   },
   "es6.typed.float64-array": {
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+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
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   },
   "es6.map": {
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-    "ios": 10,
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-    "electron": 1.2
+    "chrome": "51",
+    "edge": "15",
+    "firefox": "53",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
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+    "firefox": "53",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.weak-map": {
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-    "edge": 15,
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+    "chrome": "51",
+    "edge": "15",
+    "firefox": "53",
+    "safari": "9",
+    "node": "6.5",
+    "ios": "9",
+    "opera": "38",
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   },
   "es6.weak-set": {
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-    "edge": 15,
-    "firefox": 53,
-    "safari": 9,
-    "node": 6.5,
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+    "chrome": "51",
+    "edge": "15",
+    "firefox": "53",
+    "safari": "9",
+    "node": "6.5",
+    "ios": "9",
+    "opera": "38",
+    "electron": "1.2"
   },
   "es6.reflect.apply": {
-    "chrome": 49,
-    "edge": 12,
-    "firefox": 42,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 36,
-    "electron": 1
+    "chrome": "49",
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+    "firefox": "42",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "36",
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   },
   "es6.reflect.construct": {
-    "chrome": 49,
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-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 36,
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+    "chrome": "49",
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+    "firefox": "45",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "36",
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   },
   "es6.reflect.define-property": {
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-    "firefox": 42,
-    "safari": 10,
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-    "ios": 10,
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+    "ios": "10",
+    "opera": "36",
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   },
   "es6.reflect.delete-property": {
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   "es6.reflect.get-own-property-descriptor": {
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   "es6.reflect.is-extensible": {
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   "es6.reflect.own-keys": {
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   "es6.reflect.prevent-extensions": {
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   "es6.regexp.flags": {
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   "es6.number.is-integer": {
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   "es6.number.is-safe-integer": {
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   "es6.number.is-nan": {
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   "es6.number.max-safe-integer": {
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   },
   "es6.math.acosh": {
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   },
   "es6.math.asinh": {
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   },
   "es6.math.atanh": {
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+    "electron": "0.2"
   },
   "es6.math.cbrt": {
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+    "electron": "0.2"
   },
   "es6.math.clz32": {
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   },
   "es6.math.cosh": {
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   },
   "es6.math.expm1": {
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   },
   "es6.math.fround": {
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+    "electron": "0.2"
   },
   "es6.math.hypot": {
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+    "electron": "0.2"
   },
   "es6.math.imul": {
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+    "chrome": "30",
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+    "android": "4.4",
+    "ios": "7",
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+    "electron": "0.2"
   },
   "es6.math.log1p": {
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+    "android": "5.1",
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+    "opera": "25",
+    "electron": "0.2"
   },
   "es6.math.log10": {
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+    "chrome": "38",
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+    "node": "0.12",
+    "android": "5.1",
+    "ios": "8",
+    "opera": "25",
+    "electron": "0.2"
   },
   "es6.math.log2": {
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+    "chrome": "38",
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+    "node": "0.12",
+    "android": "5.1",
+    "ios": "8",
+    "opera": "25",
+    "electron": "0.2"
   },
   "es6.math.sign": {
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+    "chrome": "38",
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+    "android": "5.1",
+    "ios": "9",
+    "opera": "25",
+    "electron": "0.2"
   },
   "es6.math.sinh": {
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+    "chrome": "38",
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+    "android": "5.1",
+    "ios": "8",
+    "opera": "25",
+    "electron": "0.2"
   },
   "es6.math.tanh": {
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-    "firefox": 25,
-    "safari": 8,
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-    "electron": 0.2
+    "chrome": "38",
+    "edge": "12",
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+    "safari": "8",
+    "node": "0.12",
+    "android": "5.1",
+    "ios": "8",
+    "opera": "25",
+    "electron": "0.2"
   },
   "es6.math.trunc": {
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-    "android": 5.1,
-    "ios": 8,
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-    "electron": 0.2
+    "chrome": "38",
+    "edge": "12",
+    "firefox": "25",
+    "safari": "8",
+    "node": "0.12",
+    "android": "5.1",
+    "ios": "8",
+    "opera": "25",
+    "electron": "0.2"
   },
   "es7.array.includes": {
-    "chrome": 47,
-    "edge": 14,
-    "firefox": 43,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 34,
-    "electron": 0.36
+    "chrome": "47",
+    "edge": "14",
+    "firefox": "43",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "34",
+    "electron": "0.36"
   },
   "es7.object.values": {
-    "chrome": 54,
-    "edge": 14,
-    "firefox": 47,
-    "safari": 10.1,
-    "node": 7,
-    "opera": 41,
-    "electron": 1.5
+    "chrome": "54",
+    "edge": "14",
+    "firefox": "47",
+    "safari": "10.1",
+    "node": "7",
+    "opera": "41",
+    "electron": "1.5"
   },
   "es7.object.entries": {
-    "chrome": 54,
-    "edge": 14,
-    "firefox": 47,
-    "safari": 10.1,
-    "node": 7,
-    "opera": 41,
-    "electron": 1.5
+    "chrome": "54",
+    "edge": "14",
+    "firefox": "47",
+    "safari": "10.1",
+    "node": "7",
+    "opera": "41",
+    "electron": "1.5"
   },
   "es7.object.get-own-property-descriptors": {
-    "chrome": 54,
-    "edge": 15,
-    "firefox": 50,
-    "safari": 10.1,
-    "node": 7,
-    "opera": 41,
-    "electron": 1.5
+    "chrome": "54",
+    "edge": "15",
+    "firefox": "50",
+    "safari": "10.1",
+    "node": "7",
+    "opera": "41",
+    "electron": "1.5"
   },
   "es7.string.pad-start": {
-    "chrome": 57,
-    "edge": 15,
-    "firefox": 48,
-    "safari": 10,
-    "ios": 10,
-    "opera": 44
+    "chrome": "57",
+    "edge": "15",
+    "firefox": "48",
+    "safari": "10",
+    "ios": "10",
+    "opera": "44"
   },
   "es7.string.pad-end": {
-    "chrome": 57,
-    "edge": 15,
-    "firefox": 48,
-    "safari": 10,
-    "ios": 10,
-    "opera": 44
+    "chrome": "57",
+    "edge": "15",
+    "firefox": "48",
+    "safari": "10",
+    "ios": "10",
+    "opera": "44"
   }
 }
diff --git a/experimental/babel-preset-env/data/plugins.json b/experimental/babel-preset-env/data/plugins.json
index 3f1af588ce..604a79fdac 100644
--- a/experimental/babel-preset-env/data/plugins.json
+++ b/experimental/babel-preset-env/data/plugins.json
@@ -1,228 +1,228 @@
 {
   "transform-es2015-arrow-functions": {
-    "chrome": 47,
-    "edge": 13,
-    "firefox": 45,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 34,
-    "electron": 0.36
+    "chrome": "47",
+    "edge": "13",
+    "firefox": "45",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "34",
+    "electron": "0.36"
   },
   "transform-es2015-block-scoped-functions": {
-    "chrome": 41,
-    "edge": 12,
-    "firefox": 46,
-    "safari": 10,
-    "node": 4,
-    "ie": 11,
-    "ios": 10,
-    "opera": 28,
-    "electron": 0.24
+    "chrome": "41",
+    "edge": "12",
+    "firefox": "46",
+    "safari": "10",
+    "node": "4",
+    "ie": "11",
+    "ios": "10",
+    "opera": "28",
+    "electron": "0.24"
   },
   "transform-es2015-block-scoping": {
-    "chrome": 49,
-    "edge": 14,
-    "firefox": 51,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 36,
-    "electron": 1
+    "chrome": "49",
+    "edge": "14",
+    "firefox": "51",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "36",
+    "electron": "1"
   },
   "transform-es2015-classes": {
-    "chrome": 46,
-    "edge": 13,
-    "firefox": 45,
-    "safari": 10,
-    "node": 5,
-    "ios": 10,
-    "opera": 33,
-    "electron": 0.36
+    "chrome": "46",
+    "edge": "13",
+    "firefox": "45",
+    "safari": "10",
+    "node": "5",
+    "ios": "10",
+    "opera": "33",
+    "electron": "0.36"
   },
   "transform-es2015-computed-properties": {
-    "chrome": 44,
-    "edge": 12,
-    "firefox": 34,
-    "safari": 8,
-    "node": 4,
-    "ios": 8,
-    "opera": 31,
-    "electron": 0.31
+    "chrome": "44",
+    "edge": "12",
+    "firefox": "34",
+    "safari": "8",
+    "node": "4",
+    "ios": "8",
+    "opera": "31",
+    "electron": "0.31"
   },
   "check-es2015-constants": {
-    "chrome": 49,
-    "edge": 14,
-    "firefox": 51,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 36,
-    "electron": 1
+    "chrome": "49",
+    "edge": "14",
+    "firefox": "51",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "36",
+    "electron": "1"
   },
   "transform-es2015-destructuring": {
-    "chrome": 51,
-    "edge": 15,
-    "firefox": 53,
-    "safari": 10,
-    "node": 6.5,
-    "ios": 10,
-    "opera": 38,
-    "electron": 1.2
+    "chrome": "51",
+    "edge": "15",
+    "firefox": "53",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "transform-es2015-duplicate-keys": {
-    "chrome": 42,
-    "edge": 12,
-    "firefox": 34,
-    "safari": 9,
-    "node": 4,
-    "ios": 9,
-    "opera": 29,
-    "electron": 0.27
+    "chrome": "42",
+    "edge": "12",
+    "firefox": "34",
+    "safari": "9",
+    "node": "4",
+    "ios": "9",
+    "opera": "29",
+    "electron": "0.27"
   },
   "transform-es2015-for-of": {
-    "chrome": 51,
-    "edge": 15,
-    "firefox": 53,
-    "safari": 10,
-    "node": 6.5,
-    "ios": 10,
-    "opera": 38,
-    "electron": 1.2
+    "chrome": "51",
+    "edge": "15",
+    "firefox": "53",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "transform-es2015-function-name": {
-    "chrome": 51,
-    "firefox": 53,
-    "safari": 10,
-    "node": 6.5,
-    "ios": 10,
-    "opera": 38,
-    "electron": 1.2
+    "chrome": "51",
+    "firefox": "53",
+    "safari": "10",
+    "node": "6.5",
+    "ios": "10",
+    "opera": "38",
+    "electron": "1.2"
   },
   "transform-es2015-literals": {
-    "chrome": 44,
-    "edge": 12,
-    "firefox": 53,
-    "safari": 9,
-    "node": 4,
-    "ios": 9,
-    "opera": 31,
-    "electron": 0.31
+    "chrome": "44",
+    "edge": "12",
+    "firefox": "53",
+    "safari": "9",
+    "node": "4",
+    "ios": "9",
+    "opera": "31",
+    "electron": "0.31"
   },
   "transform-es2015-object-super": {
-    "chrome": 46,
-    "edge": 13,
-    "firefox": 45,
-    "safari": 10,
-    "node": 5,
-    "ios": 10,
-    "opera": 33,
-    "electron": 0.36
+    "chrome": "46",
+    "edge": "13",
+    "firefox": "45",
+    "safari": "10",
+    "node": "5",
+    "ios": "10",
+    "opera": "33",
+    "electron": "0.36"
   },
   "transform-es2015-parameters": {
-    "chrome": 49,
-    "edge": 14,
-    "firefox": 53,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 36,
-    "electron": 1
+    "chrome": "49",
+    "edge": "14",
+    "firefox": "53",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "36",
+    "electron": "1"
   },
   "transform-es2015-shorthand-properties": {
-    "chrome": 43,
-    "edge": 12,
-    "firefox": 33,
-    "safari": 9,
-    "node": 4,
-    "ios": 9,
-    "opera": 30,
-    "electron": 0.29
+    "chrome": "43",
+    "edge": "12",
+    "firefox": "33",
+    "safari": "9",
+    "node": "4",
+    "ios": "9",
+    "opera": "30",
+    "electron": "0.29"
   },
   "transform-es2015-spread": {
-    "chrome": 46,
-    "edge": 13,
-    "firefox": 36,
-    "safari": 10,
-    "node": 5,
-    "ios": 10,
-    "opera": 33,
-    "electron": 0.36
+    "chrome": "46",
+    "edge": "13",
+    "firefox": "36",
+    "safari": "10",
+    "node": "5",
+    "ios": "10",
+    "opera": "33",
+    "electron": "0.36"
   },
   "transform-es2015-sticky-regex": {
-    "chrome": 49,
-    "edge": 13,
-    "firefox": 3,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 36,
-    "electron": 1
+    "chrome": "49",
+    "edge": "13",
+    "firefox": "3",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "36",
+    "electron": "1"
   },
   "transform-es2015-template-literals": {
-    "chrome": 41,
-    "edge": 13,
-    "firefox": 34,
-    "safari": 9,
-    "node": 4,
-    "ios": 9,
-    "opera": 28,
-    "electron": 0.24
+    "chrome": "41",
+    "edge": "13",
+    "firefox": "34",
+    "safari": "9",
+    "node": "4",
+    "ios": "9",
+    "opera": "28",
+    "electron": "0.24"
   },
   "transform-es2015-typeof-symbol": {
-    "chrome": 38,
-    "edge": 12,
-    "firefox": 36,
-    "safari": 9,
-    "node": 0.12,
-    "android": 5.1,
-    "ios": 9,
-    "opera": 25,
-    "electron": 0.2
+    "chrome": "38",
+    "edge": "12",
+    "firefox": "36",
+    "safari": "9",
+    "node": "0.12",
+    "android": "5.1",
+    "ios": "9",
+    "opera": "25",
+    "electron": "0.2"
   },
   "transform-es2015-unicode-regex": {
-    "chrome": 50,
-    "edge": 13,
-    "firefox": 46,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 37,
-    "electron": 1.1
+    "chrome": "50",
+    "edge": "13",
+    "firefox": "46",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "37",
+    "electron": "1.1"
   },
   "transform-regenerator": {
-    "chrome": 50,
-    "edge": 13,
-    "firefox": 53,
-    "safari": 10,
-    "node": 6,
-    "ios": 10,
-    "opera": 37,
-    "electron": 1.1
+    "chrome": "50",
+    "edge": "13",
+    "firefox": "53",
+    "safari": "10",
+    "node": "6",
+    "ios": "10",
+    "opera": "37",
+    "electron": "1.1"
   },
   "transform-exponentiation-operator": {
-    "chrome": 52,
-    "edge": 14,
-    "firefox": 52,
-    "safari": 10.1,
-    "node": 7,
-    "opera": 39,
-    "electron": 1.3
+    "chrome": "52",
+    "edge": "14",
+    "firefox": "52",
+    "safari": "10.1",
+    "node": "7",
+    "opera": "39",
+    "electron": "1.3"
   },
   "transform-async-to-generator": {
-    "chrome": 55,
-    "firefox": 52,
-    "safari": 10.1,
-    "node": 7.6,
-    "opera": 42,
-    "electron": 1.6
+    "chrome": "55",
+    "firefox": "52",
+    "safari": "10.1",
+    "node": "7.6",
+    "opera": "42",
+    "electron": "1.6"
   },
   "syntax-trailing-function-commas": {
-    "chrome": 58,
-    "edge": 14,
-    "firefox": 52,
-    "safari": 10,
-    "ios": 10,
-    "opera": 45
+    "chrome": "58",
+    "edge": "14",
+    "firefox": "52",
+    "safari": "10",
+    "ios": "10",
+    "opera": "45"
   }
 }
diff --git a/experimental/babel-preset-env/package.json b/experimental/babel-preset-env/package.json
index 356f396006..f82f447d47 100644
--- a/experimental/babel-preset-env/package.json
+++ b/experimental/babel-preset-env/package.json
@@ -52,7 +52,8 @@
     "babel-plugin-transform-exponentiation-operator": "7.0.0-alpha.7",
     "babel-plugin-transform-regenerator": "7.0.0-alpha.7",
     "browserslist": "^1.4.0",
-    "invariant": "^2.2.2"
+    "invariant": "^2.2.2",
+    "semver": "^5.3.0"
   },
   "devDependencies": {
     "babel-cli": "7.0.0-alpha.6",
diff --git a/experimental/babel-preset-env/scripts/build-data.js b/experimental/babel-preset-env/scripts/build-data.js
index d79c2365c6..877755d868 100644
--- a/experimental/babel-preset-env/scripts/build-data.js
+++ b/experimental/babel-preset-env/scripts/build-data.js
@@ -245,20 +245,22 @@ const generateData = (environments, features) => {
     environments.forEach(env => {
       const version = getLowestImplementedVersion(options, env);
       if (version !== null) {
-        plugin[env] = version;
+        plugin[env] = version.toString();
       }
     });
 
-    // add opera
     if (plugin.chrome) {
+      // add opera
       if (plugin.chrome >= 28) {
-        plugin.opera = plugin.chrome - 13;
+        plugin.opera = (plugin.chrome - 13).toString();
       } else if (plugin.chrome === 5) {
-        plugin.opera = 12;
+        plugin.opera = "12";
       }
+
+      // add electron
       const electronVersion = chromiumToElectron(plugin.chrome);
       if (electronVersion) {
-        plugin.electron = electronVersion;
+        plugin.electron = electronVersion.toString();
       }
     }
 
diff --git a/experimental/babel-preset-env/src/index.js b/experimental/babel-preset-env/src/index.js
index b1c8842094..4cab510b09 100644
--- a/experimental/babel-preset-env/src/index.js
+++ b/experimental/babel-preset-env/src/index.js
@@ -1,4 +1,4 @@
-import browserslist from "browserslist";
+import semver from "semver";
 import builtInsList from "../data/built-ins.json";
 import { defaultWebIncludes } from "./default-includes";
 import moduleTransformations from "./module-transformations";
@@ -6,20 +6,21 @@ import normalizeOptions from "./normalize-options.js";
 import pluginList from "../data/plugins.json";
 import useBuiltInsEntryPlugin from "./use-built-ins-entry-plugin";
 import addUsedBuiltInsPlugin from "./use-built-ins-plugin";
+import getTargets from "./targets-parser";
+import { _extends, prettifyTargets, prettifyVersion, semverify } from "./utils";
 
 /**
  * Determine if a transformation is required
+ *
+ * NOTE: This assumes `supportedEnvironments` has already been parsed by `getTargets`
+ *
  * @param  {Object}  supportedEnvironments  An Object containing environment keys and the lowest
  *                                          supported version as a value
  * @param  {Object}  plugin                 An Object containing environment keys and the lowest
  *                                          version the feature was implemented in as a value
- * @return {Boolean}  Whether or not the transformation is required
+ * @return {Boolean} Whether or not the transformation is required
  */
 export const isPluginRequired = (supportedEnvironments, plugin) => {
-  if (supportedEnvironments.browsers) {
-    supportedEnvironments = getTargets(supportedEnvironments);
-  }
-
   const targetEnvironments = Object.keys(supportedEnvironments);
 
   if (targetEnvironments.length === 0) {
@@ -35,96 +36,20 @@ export const isPluginRequired = (supportedEnvironments, plugin) => {
     const lowestImplementedVersion = plugin[environment];
     const lowestTargetedVersion = supportedEnvironments[environment];
 
-    if (typeof lowestTargetedVersion === "string") {
+    if (!semver.valid(lowestTargetedVersion)) {
       throw new Error(
-        `Target version must be a number,
-          '${lowestTargetedVersion}' was given for '${environment}'`,
+        // eslint-disable-next-line max-len
+        `Invalid version passed for target "${environment}": "${lowestTargetedVersion}". Versions must be in semver format (major.minor.patch)`,
       );
     }
 
-    return lowestTargetedVersion < lowestImplementedVersion;
+    return semver.gt(
+      semverify(lowestImplementedVersion),
+      lowestTargetedVersion,
+    );
   });
 
-  return isRequiredForEnvironments.length > 0 ? true : false;
-};
-
-const isBrowsersQueryValid = browsers => {
-  return typeof browsers === "string" || Array.isArray(browsers);
-};
-
-const browserNameMap = {
-  chrome: "chrome",
-  edge: "edge",
-  firefox: "firefox",
-  ie: "ie",
-  ios_saf: "ios",
-  safari: "safari",
-};
-
-const getLowestVersions = browsers => {
-  return browsers.reduce(
-    (all, browser) => {
-      const [browserName, browserVersion] = browser.split(" ");
-      const normalizedBrowserName = browserNameMap[browserName];
-      const parsedBrowserVersion = parseInt(browserVersion);
-      if (normalizedBrowserName && !isNaN(parsedBrowserVersion)) {
-        all[normalizedBrowserName] = Math.min(
-          all[normalizedBrowserName] || Infinity,
-          parsedBrowserVersion,
-        );
-      }
-      return all;
-    },
-    {},
-  );
-};
-
-const mergeBrowsers = (fromQuery, fromTarget) => {
-  return Object.keys(fromTarget).reduce(
-    (queryObj, targKey) => {
-      if (targKey !== "browsers") {
-        queryObj[targKey] = fromTarget[targKey];
-      }
-      return queryObj;
-    },
-    fromQuery,
-  );
-};
-
-export const getCurrentNodeVersion = () => {
-  return parseFloat(process.versions.node);
-};
-
-const _extends = Object.assign ||
-  function(target) {
-    for (let i = 1; i < arguments.length; i++) {
-      const source = arguments[i];
-      for (const key in source) {
-        if (Object.prototype.hasOwnProperty.call(source, key)) {
-          target[key] = source[key];
-        }
-      }
-    }
-    return target;
-  };
-
-export const getTargets = (targets = {}) => {
-  const targetOpts = _extends({}, targets);
-
-  if (targetOpts.node === true || targetOpts.node === "current") {
-    targetOpts.node = getCurrentNodeVersion();
-  }
-
-  if (targetOpts.hasOwnProperty("uglify") && !targetOpts.uglify) {
-    delete targetOpts.uglify;
-  }
-
-  const browserOpts = targetOpts.browsers;
-  if (isBrowsersQueryValid(browserOpts)) {
-    const queryBrowsers = getLowestVersions(browserslist(browserOpts));
-    return mergeBrowsers(queryBrowsers, targetOpts);
-  }
-  return targetOpts;
+  return isRequiredForEnvironments.length > 0;
 };
 
 let hasBeenLogged = false;
@@ -133,8 +58,8 @@ const logPlugin = (plugin, targets, list) => {
   const envList = list[plugin] || {};
   const filteredList = Object.keys(targets).reduce(
     (a, b) => {
-      if (!envList[b] || targets[b] < envList[b]) {
-        a[b] = targets[b];
+      if (!envList[b] || semver.lt(targets[b], semverify(envList[b]))) {
+        a[b] = prettifyVersion(targets[b]);
       }
       return a;
     },
@@ -213,7 +138,7 @@ export default function buildPreset(context, opts = {}) {
     hasBeenLogged = true;
     console.log("babel-preset-env: `DEBUG` option");
     console.log("\nUsing targets:");
-    console.log(JSON.stringify(targets, null, 2));
+    console.log(JSON.stringify(prettifyTargets(targets), null, 2));
     console.log(`\nModules transform: ${moduleType}`);
     console.log("\nUsing plugins:");
     transformations.forEach(transform => {
diff --git a/experimental/babel-preset-env/src/targets-parser.js b/experimental/babel-preset-env/src/targets-parser.js
new file mode 100644
index 0000000000..1a8cbf7551
--- /dev/null
+++ b/experimental/babel-preset-env/src/targets-parser.js
@@ -0,0 +1,132 @@
+import browserslist from "browserslist";
+import semver from "semver";
+import { semverify } from "./utils";
+
+const browserNameMap = {
+  chrome: "chrome",
+  edge: "edge",
+  firefox: "firefox",
+  ie: "ie",
+  ios_saf: "ios",
+  safari: "safari",
+};
+
+const isBrowsersQueryValid = browsers =>
+  typeof browsers === "string" || Array.isArray(browsers);
+
+const semverMin = (first, second) => {
+  return first && semver.lt(first, second) ? first : second;
+};
+
+const getLowestVersions = browsers => {
+  return browsers.reduce(
+    (all, browser) => {
+      const [browserName, browserVersion] = browser.split(" ");
+      const normalizedBrowserName = browserNameMap[browserName];
+
+      if (!normalizedBrowserName) {
+        return all;
+      }
+
+      try {
+        // Browser version can return as "10.0-10.2"
+        const splitVersion = browserVersion.split("-")[0];
+        const parsedBrowserVersion = semverify(splitVersion);
+
+        all[normalizedBrowserName] = semverMin(
+          all[normalizedBrowserName],
+          parsedBrowserVersion,
+        );
+      } catch (e) {}
+
+      return all;
+    },
+    {},
+  );
+};
+
+const outputDecimalWarning = decimalTargets => {
+  if (!decimalTargets || !decimalTargets.length) {
+    return;
+  }
+
+  console.log("Warning, the following targets are using a decimal version:");
+  console.log("");
+  decimalTargets.forEach(({ target, value }) =>
+    console.log(`  ${target}: ${value}`));
+  console.log("");
+  console.log(
+    "We recommend using a string for minor/patch versions to avoid numbers like 6.10",
+  );
+  console.log("getting parsed as 6.1, which can lead to unexpected behavior.");
+  console.log("");
+};
+
+const targetParserMap = {
+  __default: (target, value) => [target, semverify(value)],
+
+  // Parse `node: true` and `node: "current"` to version
+  node: (target, value) => {
+    const parsed = value === true || value === "current"
+      ? process.versions.node
+      : semverify(value);
+
+    return [target, parsed];
+  },
+
+  // Only valid value for Uglify is `true`
+  uglify: (target, value) => [target, value === true],
+};
+
+const getTargets = (targets = {}) => {
+  let targetOpts = {};
+
+  // Parse browsers target via browserslist
+  if (isBrowsersQueryValid(targets.browsers)) {
+    targetOpts = getLowestVersions(browserslist(targets.browsers));
+  }
+
+  // Parse remaining targets
+  const parsed = Object.keys(targets).reduce(
+    (results, target) => {
+      if (target !== "browsers") {
+        const value = targets[target];
+
+        // Warn when specifying minor/patch as a decimal
+        if (typeof value === "number" && value % 1 !== 0) {
+          results.decimalWarnings.push({ target, value });
+        }
+
+        // Check if we have a target parser?
+        const parser = targetParserMap[target] || targetParserMap.__default;
+        const [parsedTarget, parsedValue] = parser(target, value);
+
+        if (parsedValue) {
+          // Merge (lowest wins)
+          if (typeof parsedValue === "string") {
+            results.targets[parsedTarget] = semverMin(
+              results.targets[parsedTarget],
+              parsedValue,
+            );
+          } else {
+            // We can remove this block if/when we replace Uglify target
+            // with top level option
+            results.targets[parsedTarget] = parsedValue;
+          }
+        }
+      }
+
+      return results;
+    },
+    {
+      targets: targetOpts,
+      decimalWarnings: [],
+    },
+  );
+
+  outputDecimalWarning(parsed.decimalWarnings);
+
+  return parsed.targets;
+};
+
+export default getTargets;
diff --git a/experimental/babel-preset-env/src/utils.js b/experimental/babel-preset-env/src/utils.js
new file mode 100644
index 0000000000..d2ba002e11
--- /dev/null
+++ b/experimental/babel-preset-env/src/utils.js
@@ -0,0 +1,67 @@
+// @flow
+import semver from "semver";
+
+export const _extends = Object.assign ||
+  function(target) {
+    for (let i = 1; i < arguments.length; i++) {
+      const source = arguments[i];
+      for (const key in source) {
+        if (Object.prototype.hasOwnProperty.call(source, key)) {
+          target[key] = source[key];
+        }
+      }
+    }
+    return target;
+  };
+
+// Convert version to a semver value.
+// 2.5 -> 2.5.0; 1 -> 1.0.0;
+export const semverify = version => {
+  if (typeof version === "string" && semver.valid(version)) {
+    return version;
+  }
+
+  const split = version.toString().split(".");
+
+  while (split.length < 3) {
+    split.push(0);
+  }
+
+  return split.join(".");
+};
+
+export const prettifyVersion = version => {
+  if (typeof version !== "string") {
+    return version;
+  }
+
+  const parts = [semver.major(version)];
+  const minor = semver.minor(version);
+  const patch = semver.patch(version);
+
+  if (minor || patch) {
+    parts.push(minor);
+  }
+
+  if (patch) {
+    parts.push(patch);
+  }
+
+  return parts.join(".");
+};
+
+export const prettifyTargets = (targets = {}) => {
+  return Object.keys(targets).reduce(
+    (results, target) => {
+      let value = targets[target];
+
+      if (typeof value === "string") {
+        value = prettifyVersion(value);
+      }
+
+      results[target] = value;
+      return results;
+    },
+    {},
+  );
+};
diff --git a/experimental/babel-preset-env/test/debug-fixtures/builtins-uglify/stdout.txt b/experimental/babel-preset-env/test/debug-fixtures/builtins-uglify/stdout.txt
index 017d4c6418..309441c93c 100644
--- a/experimental/babel-preset-env/test/debug-fixtures/builtins-uglify/stdout.txt
+++ b/experimental/babel-preset-env/test/debug-fixtures/builtins-uglify/stdout.txt
@@ -2,7 +2,7 @@ babel-preset-env: `DEBUG` option
 
 Using targets:
 {
-  "chrome": 55,
+  "chrome": "55",
   "uglify": true
 }
 
@@ -31,12 +31,12 @@ Using plugins:
   transform-regenerator {"uglify":true}
   transform-exponentiation-operator {"uglify":true}
   transform-async-to-generator {"uglify":true}
-  syntax-trailing-function-commas {"chrome":55,"uglify":true}
+  syntax-trailing-function-commas {"chrome":"55","uglify":true}
 
 Using polyfills:
-  es7.string.pad-start {"chrome":55}
-  es7.string.pad-end {"chrome":55}
-  web.timers {"chrome":55}
-  web.immediate {"chrome":55}
-  web.dom.iterable {"chrome":55}
-src/in.js -> lib/in.js
+  es7.string.pad-start {"chrome":"55"}
+  es7.string.pad-end {"chrome":"55"}
+  web.timers {"chrome":"55"}
+  web.immediate {"chrome":"55"}
+  web.dom.iterable {"chrome":"55"}
+src/in.js -> lib/in.js
\ No newline at end of file
diff --git a/experimental/babel-preset-env/test/debug-fixtures/builtins/stdout.txt b/experimental/babel-preset-env/test/debug-fixtures/builtins/stdout.txt
index 40aaad888a..ea235b1337 100644
--- a/experimental/babel-preset-env/test/debug-fixtures/builtins/stdout.txt
+++ b/experimental/babel-preset-env/test/debug-fixtures/builtins/stdout.txt
@@ -2,122 +2,122 @@ babel-preset-env: `DEBUG` option
 
 Using targets:
 {
-  "chrome": 54,
-  "ie": 10,
-  "node": 6
+  "chrome": "54",
+  "ie": "10",
+  "node": "6"
 }
 
 Modules transform: commonjs
 
 Using plugins:
-  transform-es2015-arrow-functions {"ie":10}
-  transform-es2015-block-scoped-functions {"ie":10}
-  transform-es2015-block-scoping {"ie":10}
-  transform-es2015-classes {"ie":10}
-  transform-es2015-computed-properties {"ie":10}
-  check-es2015-constants {"ie":10}
-  transform-es2015-destructuring {"ie":10,"node":6}
-  transform-es2015-duplicate-keys {"ie":10}
-  transform-es2015-for-of {"ie":10,"node":6}
-  transform-es2015-function-name {"ie":10,"node":6}
-  transform-es2015-literals {"ie":10}
-  transform-es2015-object-super {"ie":10}
-  transform-es2015-parameters {"ie":10}
-  transform-es2015-shorthand-properties {"ie":10}
-  transform-es2015-spread {"ie":10}
-  transform-es2015-sticky-regex {"ie":10}
-  transform-es2015-template-literals {"ie":10}
-  transform-es2015-typeof-symbol {"ie":10}
-  transform-es2015-unicode-regex {"ie":10}
-  transform-regenerator {"ie":10}
-  transform-exponentiation-operator {"ie":10,"node":6}
-  transform-async-to-generator {"chrome":54,"ie":10,"node":6}
-  syntax-trailing-function-commas {"chrome":54,"ie":10,"node":6}
+  transform-es2015-arrow-functions {"ie":"10"}
+  transform-es2015-block-scoped-functions {"ie":"10"}
+  transform-es2015-block-scoping {"ie":"10"}
+  transform-es2015-classes {"ie":"10"}
+  transform-es2015-computed-properties {"ie":"10"}
+  check-es2015-constants {"ie":"10"}
+  transform-es2015-destructuring {"ie":"10","node":"6"}
+  transform-es2015-duplicate-keys {"ie":"10"}
+  transform-es2015-for-of {"ie":"10","node":"6"}
+  transform-es2015-function-name {"ie":"10","node":"6"}
+  transform-es2015-literals {"ie":"10"}
+  transform-es2015-object-super {"ie":"10"}
+  transform-es2015-parameters {"ie":"10"}
+  transform-es2015-shorthand-properties {"ie":"10"}
+  transform-es2015-spread {"ie":"10"}
+  transform-es2015-sticky-regex {"ie":"10"}
+  transform-es2015-template-literals {"ie":"10"}
+  transform-es2015-typeof-symbol {"ie":"10"}
+  transform-es2015-unicode-regex {"ie":"10"}
+  transform-regenerator {"ie":"10"}
+  transform-exponentiation-operator {"ie":"10","node":"6"}
+  transform-async-to-generator {"chrome":"54","ie":"10","node":"6"}
+  syntax-trailing-function-commas {"chrome":"54","ie":"10","node":"6"}
 
 Using polyfills:
-  es6.typed.array-buffer {"ie":10,"node":6}
-  es6.typed.int8-array {"ie":10,"node":6}
-  es6.typed.uint8-array {"ie":10,"node":6}
-  es6.typed.uint8-clamped-array {"ie":10,"node":6}
-  es6.typed.int16-array {"ie":10,"node":6}
-  es6.typed.uint16-array {"ie":10,"node":6}
-  es6.typed.int32-array {"ie":10,"node":6}
-  es6.typed.uint32-array {"ie":10,"node":6}
-  es6.typed.float32-array {"ie":10,"node":6}
-  es6.typed.float64-array {"ie":10,"node":6}
-  es6.map {"ie":10,"node":6}
-  es6.set {"ie":10,"node":6}
-  es6.weak-map {"ie":10,"node":6}
-  es6.weak-set {"ie":10,"node":6}
-  es6.reflect.apply {"ie":10}
-  es6.reflect.construct {"ie":10}
-  es6.reflect.define-property {"ie":10}
-  es6.reflect.delete-property {"ie":10}
-  es6.reflect.get {"ie":10}
-  es6.reflect.get-own-property-descriptor {"ie":10}
-  es6.reflect.get-prototype-of {"ie":10}
-  es6.reflect.has {"ie":10}
-  es6.reflect.is-extensible {"ie":10}
-  es6.reflect.own-keys {"ie":10}
-  es6.reflect.prevent-extensions {"ie":10}
-  es6.reflect.set {"ie":10}
-  es6.reflect.set-prototype-of {"ie":10}
-  es6.promise {"ie":10,"node":6}
-  es6.symbol {"ie":10,"node":6}
-  es6.object.assign {"ie":10}
-  es6.object.is {"ie":10}
-  es6.object.set-prototype-of {"ie":10}
-  es6.function.name {"ie":10,"node":6}
-  es6.string.raw {"ie":10}
-  es6.string.from-code-point {"ie":10}
-  es6.string.code-point-at {"ie":10}
-  es6.string.repeat {"ie":10}
-  es6.string.starts-with {"ie":10}
-  es6.string.ends-with {"ie":10}
-  es6.string.includes {"ie":10}
-  es6.regexp.flags {"ie":10}
-  es6.regexp.match {"ie":10}
-  es6.regexp.replace {"ie":10}
-  es6.regexp.split {"ie":10}
-  es6.regexp.search {"ie":10}
-  es6.array.from {"ie":10,"node":6}
-  es6.array.of {"ie":10}
-  es6.array.copy-within {"ie":10}
-  es6.array.find {"ie":10}
-  es6.array.find-index {"ie":10}
-  es6.array.fill {"ie":10}
-  es6.array.iterator {"ie":10}
-  es6.number.is-finite {"ie":10}
-  es6.number.is-integer {"ie":10}
-  es6.number.is-safe-integer {"ie":10}
-  es6.number.is-nan {"ie":10}
-  es6.number.epsilon {"ie":10}
-  es6.number.min-safe-integer {"ie":10}
-  es6.number.max-safe-integer {"ie":10}
-  es6.math.acosh {"ie":10}
-  es6.math.asinh {"ie":10}
-  es6.math.atanh {"ie":10}
-  es6.math.cbrt {"ie":10}
-  es6.math.clz32 {"ie":10}
-  es6.math.cosh {"ie":10}
-  es6.math.expm1 {"ie":10}
-  es6.math.fround {"ie":10}
-  es6.math.hypot {"ie":10}
-  es6.math.imul {"ie":10}
-  es6.math.log1p {"ie":10}
-  es6.math.log10 {"ie":10}
-  es6.math.log2 {"ie":10}
-  es6.math.sign {"ie":10}
-  es6.math.sinh {"ie":10}
-  es6.math.tanh {"ie":10}
-  es6.math.trunc {"ie":10}
-  es7.array.includes {"ie":10}
-  es7.object.values {"ie":10,"node":6}
-  es7.object.entries {"ie":10,"node":6}
-  es7.object.get-own-property-descriptors {"ie":10,"node":6}
-  es7.string.pad-start {"chrome":54,"ie":10,"node":6}
-  es7.string.pad-end {"chrome":54,"ie":10,"node":6}
-  web.timers {"chrome":54,"ie":10,"node":6}
-  web.immediate {"chrome":54,"ie":10,"node":6}
-  web.dom.iterable {"chrome":54,"ie":10,"node":6}
-src/in.js -> lib/in.js
+  es6.typed.array-buffer {"ie":"10","node":"6"}
+  es6.typed.int8-array {"ie":"10","node":"6"}
+  es6.typed.uint8-array {"ie":"10","node":"6"}
+  es6.typed.uint8-clamped-array {"ie":"10","node":"6"}
+  es6.typed.int16-array {"ie":"10","node":"6"}
+  es6.typed.uint16-array {"ie":"10","node":"6"}
+  es6.typed.int32-array {"ie":"10","node":"6"}
+  es6.typed.uint32-array {"ie":"10","node":"6"}
+  es6.typed.float32-array {"ie":"10","node":"6"}
+  es6.typed.float64-array {"ie":"10","node":"6"}
+  es6.map {"ie":"10","node":"6"}
+  es6.set {"ie":"10","node":"6"}
+  es6.weak-map {"ie":"10","node":"6"}
+  es6.weak-set {"ie":"10","node":"6"}
+  es6.reflect.apply {"ie":"10"}
+  es6.reflect.construct {"ie":"10"}
+  es6.reflect.define-property {"ie":"10"}
+  es6.reflect.delete-property {"ie":"10"}
+  es6.reflect.get {"ie":"10"}
+  es6.reflect.get-own-property-descriptor {"ie":"10"}
+  es6.reflect.get-prototype-of {"ie":"10"}
+  es6.reflect.has {"ie":"10"}
+  es6.reflect.is-extensible {"ie":"10"}
+  es6.reflect.own-keys {"ie":"10"}
+  es6.reflect.prevent-extensions {"ie":"10"}
+  es6.reflect.set {"ie":"10"}
+  es6.reflect.set-prototype-of {"ie":"10"}
+  es6.promise {"ie":"10","node":"6"}
+  es6.symbol {"ie":"10","node":"6"}
+  es6.object.assign {"ie":"10"}
+  es6.object.is {"ie":"10"}
+  es6.object.set-prototype-of {"ie":"10"}
+  es6.function.name {"ie":"10","node":"6"}
+  es6.string.raw {"ie":"10"}
+  es6.string.from-code-point {"ie":"10"}
+  es6.string.code-point-at {"ie":"10"}
+  es6.string.repeat {"ie":"10"}
+  es6.string.starts-with {"ie":"10"}
+  es6.string.ends-with {"ie":"10"}
+  es6.string.includes {"ie":"10"}
+  es6.regexp.flags {"ie":"10"}
+  es6.regexp.match {"ie":"10"}
+  es6.regexp.replace {"ie":"10"}
+  es6.regexp.split {"ie":"10"}
+  es6.regexp.search {"ie":"10"}
+  es6.array.from {"ie":"10","node":"6"}
+  es6.array.of {"ie":"10"}
+  es6.array.copy-within {"ie":"10"}
+  es6.array.find {"ie":"10"}
+  es6.array.find-index {"ie":"10"}
+  es6.array.fill {"ie":"10"}
+  es6.array.iterator {"ie":"10"}
+  es6.number.is-finite {"ie":"10"}
+  es6.number.is-integer {"ie":"10"}
+  es6.number.is-safe-integer {"ie":"10"}
+  es6.number.is-nan {"ie":"10"}
+  es6.number.epsilon {"ie":"10"}
+  es6.number.min-safe-integer {"ie":"10"}
+  es6.number.max-safe-integer {"ie":"10"}
+  es6.math.acosh {"ie":"10"}
+  es6.math.asinh {"ie":"10"}
+  es6.math.atanh {"ie":"10"}
+  es6.math.cbrt {"ie":"10"}
+  es6.math.clz32 {"ie":"10"}
+  es6.math.cosh {"ie":"10"}
+  es6.math.expm1 {"ie":"10"}
+  es6.math.fround {"ie":"10"}
+  es6.math.hypot {"ie":"10"}
+  es6.math.imul {"ie":"10"}
+  es6.math.log1p {"ie":"10"}
+  es6.math.log10 {"ie":"10"}
+  es6.math.log2 {"ie":"10"}
+  es6.math.sign {"ie":"10"}
+  es6.math.sinh {"ie":"10"}
+  es6.math.tanh {"ie":"10"}
+  es6.math.trunc {"ie":"10"}
+  es7.array.includes {"ie":"10"}
+  es7.object.values {"ie":"10","node":"6"}
+  es7.object.entries {"ie":"10","node":"6"}
+  es7.object.get-own-property-descriptors {"ie":"10","node":"6"}
+  es7.string.pad-start {"chrome":"54","ie":"10","node":"6"}
+  es7.string.pad-end {"chrome":"54","ie":"10","node":"6"}
+  web.timers {"chrome":"54","ie":"10","node":"6"}
+  web.immediate {"chrome":"54","ie":"10","node":"6"}
+  web.dom.iterable {"chrome":"54","ie":"10","node":"6"}
+src/in.js -> lib/in.js
\ No newline at end of file
diff --git a/experimental/babel-preset-env/test/debug-fixtures/electron/stdout.txt b/experimental/babel-preset-env/test/debug-fixtures/electron/stdout.txt
index 7c2efa828a..c4919b2e87 100644
--- a/experimental/babel-preset-env/test/debug-fixtures/electron/stdout.txt
+++ b/experimental/babel-preset-env/test/debug-fixtures/electron/stdout.txt
@@ -1,69 +1,77 @@
+Warning, the following targets are using a decimal version:
+
+  electron: 0.36
+
+We recommend using a string for minor/patch versions to avoid numbers like 6.10
+getting parsed as 6.1, which can lead to unexpected behavior.
+
 babel-preset-env: `DEBUG` option
 
 Using targets:
 {
-  "electron": 0.36
+  "electron": "0.36"
 }
 
 Modules transform: commonjs
 
 Using plugins:
-  transform-es2015-block-scoping {"electron":0.36}
-  check-es2015-constants {"electron":0.36}
-  transform-es2015-destructuring {"electron":0.36}
-  transform-es2015-for-of {"electron":0.36}
-  transform-es2015-function-name {"electron":0.36}
-  transform-es2015-parameters {"electron":0.36}
-  transform-es2015-sticky-regex {"electron":0.36}
-  transform-es2015-unicode-regex {"electron":0.36}
-  transform-regenerator {"electron":0.36}
-  transform-exponentiation-operator {"electron":0.36}
-  transform-async-to-generator {"electron":0.36}
-  syntax-trailing-function-commas {"electron":0.36}
+  transform-es2015-block-scoping {"electron":"0.36"}
+  check-es2015-constants {"electron":"0.36"}
+  transform-es2015-destructuring {"electron":"0.36"}
+  transform-es2015-for-of {"electron":"0.36"}
+  transform-es2015-function-name {"electron":"0.36"}
+  transform-es2015-parameters {"electron":"0.36"}
+  transform-es2015-sticky-regex {"electron":"0.36"}
+  transform-es2015-unicode-regex {"electron":"0.36"}
+  transform-regenerator {"electron":"0.36"}
+  transform-exponentiation-operator {"electron":"0.36"}
+  transform-async-to-generator {"electron":"0.36"}
+  syntax-trailing-function-commas {"electron":"0.36"}
 
 Using polyfills:
-  es6.typed.array-buffer {"electron":0.36}
-  es6.typed.int8-array {"electron":0.36}
-  es6.typed.uint8-array {"electron":0.36}
-  es6.typed.uint8-clamped-array {"electron":0.36}
-  es6.typed.int16-array {"electron":0.36}
-  es6.typed.uint16-array {"electron":0.36}
-  es6.typed.int32-array {"electron":0.36}
-  es6.typed.uint32-array {"electron":0.36}
-  es6.typed.float32-array {"electron":0.36}
-  es6.typed.float64-array {"electron":0.36}
-  es6.map {"electron":0.36}
-  es6.set {"electron":0.36}
-  es6.weak-map {"electron":0.36}
-  es6.weak-set {"electron":0.36}
-  es6.reflect.apply {"electron":0.36}
-  es6.reflect.construct {"electron":0.36}
-  es6.reflect.define-property {"electron":0.36}
-  es6.reflect.delete-property {"electron":0.36}
-  es6.reflect.get {"electron":0.36}
-  es6.reflect.get-own-property-descriptor {"electron":0.36}
-  es6.reflect.get-prototype-of {"electron":0.36}
-  es6.reflect.has {"electron":0.36}
-  es6.reflect.is-extensible {"electron":0.36}
-  es6.reflect.own-keys {"electron":0.36}
-  es6.reflect.prevent-extensions {"electron":0.36}
-  es6.reflect.set {"electron":0.36}
-  es6.reflect.set-prototype-of {"electron":0.36}
-  es6.promise {"electron":0.36}
-  es6.symbol {"electron":0.36}
-  es6.function.name {"electron":0.36}
-  es6.regexp.flags {"electron":0.36}
-  es6.regexp.match {"electron":0.36}
-  es6.regexp.replace {"electron":0.36}
-  es6.regexp.split {"electron":0.36}
-  es6.regexp.search {"electron":0.36}
-  es6.array.from {"electron":0.36}
-  es7.object.values {"electron":0.36}
-  es7.object.entries {"electron":0.36}
-  es7.object.get-own-property-descriptors {"electron":0.36}
-  es7.string.pad-start {"electron":0.36}
-  es7.string.pad-end {"electron":0.36}
-  web.timers {"electron":0.36}
-  web.immediate {"electron":0.36}
-  web.dom.iterable {"electron":0.36}
-src/in.js -> lib/in.js
+  es6.typed.array-buffer {"electron":"0.36"}
+  es6.typed.data-view {"electron":"0.36"}
+  es6.typed.int8-array {"electron":"0.36"}
+  es6.typed.uint8-array {"electron":"0.36"}
+  es6.typed.uint8-clamped-array {"electron":"0.36"}
+  es6.typed.int16-array {"electron":"0.36"}
+  es6.typed.uint16-array {"electron":"0.36"}
+  es6.typed.int32-array {"electron":"0.36"}
+  es6.typed.uint32-array {"electron":"0.36"}
+  es6.typed.float32-array {"electron":"0.36"}
+  es6.typed.float64-array {"electron":"0.36"}
+  es6.map {"electron":"0.36"}
+  es6.set {"electron":"0.36"}
+  es6.weak-map {"electron":"0.36"}
+  es6.weak-set {"electron":"0.36"}
+  es6.reflect.apply {"electron":"0.36"}
+  es6.reflect.construct {"electron":"0.36"}
+  es6.reflect.define-property {"electron":"0.36"}
+  es6.reflect.delete-property {"electron":"0.36"}
+  es6.reflect.get {"electron":"0.36"}
+  es6.reflect.get-own-property-descriptor {"electron":"0.36"}
+  es6.reflect.get-prototype-of {"electron":"0.36"}
+  es6.reflect.has {"electron":"0.36"}
+  es6.reflect.is-extensible {"electron":"0.36"}
+  es6.reflect.own-keys {"electron":"0.36"}
+  es6.reflect.prevent-extensions {"electron":"0.36"}
+  es6.reflect.set {"electron":"0.36"}
+  es6.reflect.set-prototype-of {"electron":"0.36"}
+  es6.promise {"electron":"0.36"}
+  es6.symbol {"electron":"0.36"}
+  es6.function.name {"electron":"0.36"}
+  es6.regexp.flags {"electron":"0.36"}
+  es6.regexp.match {"electron":"0.36"}
+  es6.regexp.replace {"electron":"0.36"}
+  es6.regexp.split {"electron":"0.36"}
+  es6.regexp.search {"electron":"0.36"}
+  es6.array.from {"electron":"0.36"}
+  es7.object.values {"electron":"0.36"}
+  es7.object.entries {"electron":"0.36"}
+  es7.object.get-own-property-descriptors {"electron":"0.36"}
+  es7.string.pad-start {"electron":"0.36"}
+  es7.string.pad-end {"electron":"0.36"}
+  web.timers {"electron":"0.36"}
+  web.immediate {"electron":"0.36"}
+  web.dom.iterable {"electron":"0.36"}
+src/in.js -> lib/in.js
\ No newline at end of file
diff --git a/experimental/babel-preset-env/test/debug-fixtures/plugins-only/options.json b/experimental/babel-preset-env/test/debug-fixtures/plugins-only/options.json
index e34ba84885..dac357fb3a 100644
--- a/experimental/babel-preset-env/test/debug-fixtures/plugins-only/options.json
+++ b/experimental/babel-preset-env/test/debug-fixtures/plugins-only/options.json
@@ -4,7 +4,8 @@
       "debug": true,
       "exclude": [
         "transform-async-to-generator",
-        "transform-regenerator", "transform-es2015-parameters"
+        "transform-regenerator",
+        "transform-es2015-parameters"
       ],
       "targets": {
         "firefox": 52,
diff --git a/experimental/babel-preset-env/test/debug-fixtures/plugins-only/stdout.txt b/experimental/babel-preset-env/test/debug-fixtures/plugins-only/stdout.txt
index a2ccd28beb..d66728380e 100644
--- a/experimental/babel-preset-env/test/debug-fixtures/plugins-only/stdout.txt
+++ b/experimental/babel-preset-env/test/debug-fixtures/plugins-only/stdout.txt
@@ -1,17 +1,24 @@
+Warning, the following targets are using a decimal version:
+
+  node: 7.4
+
+We recommend using a string for minor/patch versions to avoid numbers like 6.10
+getting parsed as 6.1, which can lead to unexpected behavior.
+
 babel-preset-env: `DEBUG` option
 
 Using targets:
 {
-  "firefox": 52,
-  "node": 7.4
+  "firefox": "52",
+  "node": "7.4"
 }
 
 Modules transform: commonjs
 
 Using plugins:
-  transform-es2015-destructuring {"firefox":52}
-  transform-es2015-for-of {"firefox":52}
-  transform-es2015-function-name {"firefox":52}
-  transform-es2015-literals {"firefox":52}
-  syntax-trailing-function-commas {"node":7.4}
+  transform-es2015-destructuring {"firefox":"52"}
+  transform-es2015-for-of {"firefox":"52"}
+  transform-es2015-function-name {"firefox":"52"}
+  transform-es2015-literals {"firefox":"52"}
+  syntax-trailing-function-commas {"node":"7.4"}
 src/in.js -> lib/in.js
\ No newline at end of file
diff --git a/experimental/babel-preset-env/test/debug-fixtures/specific-targets/stdout.txt b/experimental/babel-preset-env/test/debug-fixtures/specific-targets/stdout.txt
index f2b273e78b..8b126383d7 100644
--- a/experimental/babel-preset-env/test/debug-fixtures/specific-targets/stdout.txt
+++ b/experimental/babel-preset-env/test/debug-fixtures/specific-targets/stdout.txt
@@ -2,125 +2,125 @@ babel-preset-env: `DEBUG` option
 
 Using targets:
 {
-  "chrome": 54,
-  "edge": 13,
-  "firefox": 49,
-  "ie": 10,
-  "ios": 9,
-  "safari": 7
+  "chrome": "54",
+  "edge": "13",
+  "firefox": "49",
+  "ie": "10",
+  "ios": "9",
+  "safari": "7"
 }
 
 Modules transform: commonjs
 
 Using plugins:
-  transform-es2015-arrow-functions {"ie":10,"ios":9,"safari":7}
-  transform-es2015-block-scoped-functions {"ie":10,"ios":9,"safari":7}
-  transform-es2015-block-scoping {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-es2015-classes {"ie":10,"ios":9,"safari":7}
-  transform-es2015-computed-properties {"ie":10,"safari":7}
-  check-es2015-constants {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-es2015-destructuring {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-es2015-duplicate-keys {"ie":10,"safari":7}
-  transform-es2015-for-of {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-es2015-function-name {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-es2015-literals {"firefox":49,"ie":10,"safari":7}
-  transform-es2015-object-super {"ie":10,"ios":9,"safari":7}
-  transform-es2015-parameters {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-es2015-shorthand-properties {"ie":10,"safari":7}
-  transform-es2015-spread {"ie":10,"ios":9,"safari":7}
-  transform-es2015-sticky-regex {"ie":10,"ios":9,"safari":7}
-  transform-es2015-template-literals {"ie":10,"safari":7}
-  transform-es2015-typeof-symbol {"ie":10,"safari":7}
-  transform-es2015-unicode-regex {"ie":10,"ios":9,"safari":7}
-  transform-regenerator {"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-exponentiation-operator {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  transform-async-to-generator {"chrome":54,"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  syntax-trailing-function-commas {"chrome":54,"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
+  transform-es2015-arrow-functions {"ie":"10","ios":"9","safari":"7"}
+  transform-es2015-block-scoped-functions {"ie":"10","ios":"9","safari":"7"}
+  transform-es2015-block-scoping {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-es2015-classes {"ie":"10","ios":"9","safari":"7"}
+  transform-es2015-computed-properties {"ie":"10","safari":"7"}
+  check-es2015-constants {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-es2015-destructuring {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-es2015-duplicate-keys {"ie":"10","safari":"7"}
+  transform-es2015-for-of {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-es2015-function-name {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-es2015-literals {"firefox":"49","ie":"10","safari":"7"}
+  transform-es2015-object-super {"ie":"10","ios":"9","safari":"7"}
+  transform-es2015-parameters {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-es2015-shorthand-properties {"ie":"10","safari":"7"}
+  transform-es2015-spread {"ie":"10","ios":"9","safari":"7"}
+  transform-es2015-sticky-regex {"ie":"10","ios":"9","safari":"7"}
+  transform-es2015-template-literals {"ie":"10","safari":"7"}
+  transform-es2015-typeof-symbol {"ie":"10","safari":"7"}
+  transform-es2015-unicode-regex {"ie":"10","ios":"9","safari":"7"}
+  transform-regenerator {"firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-exponentiation-operator {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  transform-async-to-generator {"chrome":"54","edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  syntax-trailing-function-commas {"chrome":"54","edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
 
 Using polyfills:
-  es6.typed.array-buffer {"ie":10,"ios":9,"safari":7}
-  es6.typed.int8-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.uint8-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.uint8-clamped-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.int16-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.uint16-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.int32-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.uint32-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.float32-array {"ie":10,"ios":9,"safari":7}
-  es6.typed.float64-array {"ie":10,"ios":9,"safari":7}
-  es6.map {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  es6.set {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  es6.weak-map {"edge":13,"firefox":49,"ie":10,"safari":7}
-  es6.weak-set {"edge":13,"firefox":49,"ie":10,"safari":7}
-  es6.reflect.apply {"ie":10,"ios":9,"safari":7}
-  es6.reflect.construct {"ie":10,"ios":9,"safari":7}
-  es6.reflect.define-property {"ie":10,"ios":9,"safari":7}
-  es6.reflect.delete-property {"ie":10,"ios":9,"safari":7}
-  es6.reflect.get {"ie":10,"ios":9,"safari":7}
-  es6.reflect.get-own-property-descriptor {"ie":10,"ios":9,"safari":7}
-  es6.reflect.get-prototype-of {"ie":10,"ios":9,"safari":7}
-  es6.reflect.has {"ie":10,"ios":9,"safari":7}
-  es6.reflect.is-extensible {"ie":10,"ios":9,"safari":7}
-  es6.reflect.own-keys {"ie":10,"ios":9,"safari":7}
-  es6.reflect.prevent-extensions {"ie":10,"ios":9,"safari":7}
-  es6.reflect.set {"ie":10,"ios":9,"safari":7}
-  es6.reflect.set-prototype-of {"ie":10,"ios":9,"safari":7}
-  es6.promise {"ie":10,"ios":9,"safari":7}
-  es6.symbol {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  es6.object.assign {"ie":10,"safari":7}
-  es6.object.is {"ie":10,"safari":7}
-  es6.object.set-prototype-of {"ie":10,"safari":7}
-  es6.function.name {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  es6.string.raw {"ie":10,"safari":7}
-  es6.string.from-code-point {"ie":10,"safari":7}
-  es6.string.code-point-at {"ie":10,"safari":7}
-  es6.string.repeat {"ie":10,"safari":7}
-  es6.string.starts-with {"ie":10,"safari":7}
-  es6.string.ends-with {"ie":10,"safari":7}
-  es6.string.includes {"ie":10,"safari":7}
-  es6.regexp.flags {"edge":13,"ie":10,"safari":7}
-  es6.regexp.match {"edge":13,"ie":10,"ios":9,"safari":7}
-  es6.regexp.replace {"edge":13,"ie":10,"ios":9,"safari":7}
-  es6.regexp.split {"edge":13,"ie":10,"ios":9,"safari":7}
-  es6.regexp.search {"edge":13,"ie":10,"ios":9,"safari":7}
-  es6.array.from {"edge":13,"ie":10,"ios":9,"safari":7}
-  es6.array.of {"ie":10,"safari":7}
-  es6.array.copy-within {"ie":10,"safari":7}
-  es6.array.find {"ie":10,"safari":7}
-  es6.array.find-index {"ie":10,"safari":7}
-  es6.array.fill {"ie":10,"safari":7}
-  es6.array.iterator {"ie":10,"safari":7}
-  es6.number.is-finite {"ie":10,"safari":7}
-  es6.number.is-integer {"ie":10,"safari":7}
-  es6.number.is-safe-integer {"ie":10,"safari":7}
-  es6.number.is-nan {"ie":10,"safari":7}
-  es6.number.epsilon {"ie":10,"safari":7}
-  es6.number.min-safe-integer {"ie":10,"safari":7}
-  es6.number.max-safe-integer {"ie":10,"safari":7}
-  es6.math.acosh {"ie":10,"safari":7}
-  es6.math.asinh {"ie":10,"safari":7}
-  es6.math.atanh {"ie":10,"safari":7}
-  es6.math.cbrt {"ie":10,"safari":7}
-  es6.math.clz32 {"ie":10,"safari":7}
-  es6.math.cosh {"ie":10,"safari":7}
-  es6.math.expm1 {"ie":10,"safari":7}
-  es6.math.fround {"ie":10,"safari":7}
-  es6.math.hypot {"ie":10,"safari":7}
-  es6.math.imul {"ie":10}
-  es6.math.log1p {"ie":10,"safari":7}
-  es6.math.log10 {"ie":10,"safari":7}
-  es6.math.log2 {"ie":10,"safari":7}
-  es6.math.sign {"ie":10,"safari":7}
-  es6.math.sinh {"ie":10,"safari":7}
-  es6.math.tanh {"ie":10,"safari":7}
-  es6.math.trunc {"ie":10,"safari":7}
-  es7.array.includes {"edge":13,"ie":10,"ios":9,"safari":7}
-  es7.object.values {"edge":13,"ie":10,"ios":9,"safari":7}
-  es7.object.entries {"edge":13,"ie":10,"ios":9,"safari":7}
-  es7.object.get-own-property-descriptors {"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  es7.string.pad-start {"chrome":54,"edge":13,"ie":10,"ios":9,"safari":7}
-  es7.string.pad-end {"chrome":54,"edge":13,"ie":10,"ios":9,"safari":7}
-  web.timers {"chrome":54,"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  web.immediate {"chrome":54,"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
-  web.dom.iterable {"chrome":54,"edge":13,"firefox":49,"ie":10,"ios":9,"safari":7}
+  es6.typed.array-buffer {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.int8-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.uint8-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.uint8-clamped-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.int16-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.uint16-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.int32-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.uint32-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.float32-array {"ie":"10","ios":"9","safari":"7"}
+  es6.typed.float64-array {"ie":"10","ios":"9","safari":"7"}
+  es6.map {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  es6.set {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  es6.weak-map {"edge":"13","firefox":"49","ie":"10","safari":"7"}
+  es6.weak-set {"edge":"13","firefox":"49","ie":"10","safari":"7"}
+  es6.reflect.apply {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.construct {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.define-property {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.delete-property {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.get {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.get-own-property-descriptor {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.get-prototype-of {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.has {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.is-extensible {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.own-keys {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.prevent-extensions {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.set {"ie":"10","ios":"9","safari":"7"}
+  es6.reflect.set-prototype-of {"ie":"10","ios":"9","safari":"7"}
+  es6.promise {"ie":"10","ios":"9","safari":"7"}
+  es6.symbol {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  es6.object.assign {"ie":"10","safari":"7"}
+  es6.object.is {"ie":"10","safari":"7"}
+  es6.object.set-prototype-of {"ie":"10","safari":"7"}
+  es6.function.name {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  es6.string.raw {"ie":"10","safari":"7"}
+  es6.string.from-code-point {"ie":"10","safari":"7"}
+  es6.string.code-point-at {"ie":"10","safari":"7"}
+  es6.string.repeat {"ie":"10","safari":"7"}
+  es6.string.starts-with {"ie":"10","safari":"7"}
+  es6.string.ends-with {"ie":"10","safari":"7"}
+  es6.string.includes {"ie":"10","safari":"7"}
+  es6.regexp.flags {"edge":"13","ie":"10","safari":"7"}
+  es6.regexp.match {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es6.regexp.replace {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es6.regexp.split {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es6.regexp.search {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es6.array.from {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es6.array.of {"ie":"10","safari":"7"}
+  es6.array.copy-within {"ie":"10","safari":"7"}
+  es6.array.find {"ie":"10","safari":"7"}
+  es6.array.find-index {"ie":"10","safari":"7"}
+  es6.array.fill {"ie":"10","safari":"7"}
+  es6.array.iterator {"ie":"10","safari":"7"}
+  es6.number.is-finite {"ie":"10","safari":"7"}
+  es6.number.is-integer {"ie":"10","safari":"7"}
+  es6.number.is-safe-integer {"ie":"10","safari":"7"}
+  es6.number.is-nan {"ie":"10","safari":"7"}
+  es6.number.epsilon {"ie":"10","safari":"7"}
+  es6.number.min-safe-integer {"ie":"10","safari":"7"}
+  es6.number.max-safe-integer {"ie":"10","safari":"7"}
+  es6.math.acosh {"ie":"10","safari":"7"}
+  es6.math.asinh {"ie":"10","safari":"7"}
+  es6.math.atanh {"ie":"10","safari":"7"}
+  es6.math.cbrt {"ie":"10","safari":"7"}
+  es6.math.clz32 {"ie":"10","safari":"7"}
+  es6.math.cosh {"ie":"10","safari":"7"}
+  es6.math.expm1 {"ie":"10","safari":"7"}
+  es6.math.fround {"ie":"10","safari":"7"}
+  es6.math.hypot {"ie":"10","safari":"7"}
+  es6.math.imul {"ie":"10"}
+  es6.math.log1p {"ie":"10","safari":"7"}
+  es6.math.log10 {"ie":"10","safari":"7"}
+  es6.math.log2 {"ie":"10","safari":"7"}
+  es6.math.sign {"ie":"10","safari":"7"}
+  es6.math.sinh {"ie":"10","safari":"7"}
+  es6.math.tanh {"ie":"10","safari":"7"}
+  es6.math.trunc {"ie":"10","safari":"7"}
+  es7.array.includes {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es7.object.values {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es7.object.entries {"edge":"13","ie":"10","ios":"9","safari":"7"}
+  es7.object.get-own-property-descriptors {"edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  es7.string.pad-start {"chrome":"54","edge":"13","ie":"10","ios":"9","safari":"7"}
+  es7.string.pad-end {"chrome":"54","edge":"13","ie":"10","ios":"9","safari":"7"}
+  web.timers {"chrome":"54","edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  web.immediate {"chrome":"54","edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
+  web.dom.iterable {"chrome":"54","edge":"13","firefox":"49","ie":"10","ios":"9","safari":"7"}
 src/in.js -> lib/in.js
\ No newline at end of file
diff --git a/experimental/babel-preset-env/test/debug-fixtures/versions-decimals/options.json b/experimental/babel-preset-env/test/debug-fixtures/versions-decimals/options.json
new file mode 100644
index 0000000000..451949b4eb
--- /dev/null
+++ b/experimental/babel-preset-env/test/debug-fixtures/versions-decimals/options.json
@@ -0,0 +1,13 @@
+{
+  "presets": [
+    ["../../lib", {
+      "debug": true,
+      "targets": {
+        "chrome": 54,
+        "electron": 0.36,
+        "node": 6.10,
+        "ie": 10
+      }
+    }]
+  ]
+}
diff --git a/experimental/babel-preset-env/test/debug-fixtures/versions-decimals/stdout.txt b/experimental/babel-preset-env/test/debug-fixtures/versions-decimals/stdout.txt
new file mode 100644
index 0000000000..25a05c319e
--- /dev/null
+++ b/experimental/babel-preset-env/test/debug-fixtures/versions-decimals/stdout.txt
@@ -0,0 +1,133 @@
+Warning, the following targets are using a decimal version:
+
+  electron: 0.36
+  node: 6.1
+
+We recommend using a string for minor/patch versions to avoid numbers like 6.10
+getting parsed as 6.1, which can lead to unexpected behavior.
+
+babel-preset-env: `DEBUG` option
+
+Using targets:
+{
+  "chrome": "54",
+  "electron": "0.36",
+  "node": "6.1",
+  "ie": "10"
+}
+
+Modules transform: commonjs
+
+Using plugins:
+  transform-es2015-arrow-functions {"ie":"10"}
+  transform-es2015-block-scoped-functions {"ie":"10"}
+  transform-es2015-block-scoping {"electron":"0.36","ie":"10"}
+  transform-es2015-classes {"ie":"10"}
+  transform-es2015-computed-properties {"ie":"10"}
+  check-es2015-constants {"electron":"0.36","ie":"10"}
+  transform-es2015-destructuring {"electron":"0.36","node":"6.1","ie":"10"}
+  transform-es2015-duplicate-keys {"ie":"10"}
+  transform-es2015-for-of {"electron":"0.36","node":"6.1","ie":"10"}
+  transform-es2015-function-name {"electron":"0.36","node":"6.1","ie":"10"}
+  transform-es2015-literals {"ie":"10"}
+  transform-es2015-object-super {"ie":"10"}
+  transform-es2015-parameters {"electron":"0.36","ie":"10"}
+  transform-es2015-shorthand-properties {"ie":"10"}
+  transform-es2015-spread {"ie":"10"}
+  transform-es2015-sticky-regex {"electron":"0.36","ie":"10"}
+  transform-es2015-template-literals {"ie":"10"}
+  transform-es2015-typeof-symbol {"ie":"10"}
+  transform-es2015-unicode-regex {"electron":"0.36","ie":"10"}
+  transform-regenerator {"electron":"0.36","ie":"10"}
+  transform-exponentiation-operator {"electron":"0.36","node":"6.1","ie":"10"}
+  transform-async-to-generator {"chrome":"54","electron":"0.36","node":"6.1","ie":"10"}
+  syntax-trailing-function-commas {"chrome":"54","electron":"0.36","node":"6.1","ie":"10"}
+
+Using polyfills:
+  es6.typed.array-buffer {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.data-view {"electron":"0.36"}
+  es6.typed.int8-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.uint8-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.uint8-clamped-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.int16-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.uint16-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.int32-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.uint32-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.float32-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.typed.float64-array {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.map {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.set {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.weak-map {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.weak-set {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.reflect.apply {"electron":"0.36","ie":"10"}
+  es6.reflect.construct {"electron":"0.36","ie":"10"}
+  es6.reflect.define-property {"electron":"0.36","ie":"10"}
+  es6.reflect.delete-property {"electron":"0.36","ie":"10"}
+  es6.reflect.get {"electron":"0.36","ie":"10"}
+  es6.reflect.get-own-property-descriptor {"electron":"0.36","ie":"10"}
+  es6.reflect.get-prototype-of {"electron":"0.36","ie":"10"}
+  es6.reflect.has {"electron":"0.36","ie":"10"}
+  es6.reflect.is-extensible {"electron":"0.36","ie":"10"}
+  es6.reflect.own-keys {"electron":"0.36","ie":"10"}
+  es6.reflect.prevent-extensions {"electron":"0.36","ie":"10"}
+  es6.reflect.set {"electron":"0.36","ie":"10"}
+  es6.reflect.set-prototype-of {"electron":"0.36","ie":"10"}
+  es6.promise {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.symbol {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.object.assign {"ie":"10"}
+  es6.object.is {"ie":"10"}
+  es6.object.set-prototype-of {"ie":"10"}
+  es6.function.name {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.string.raw {"ie":"10"}
+  es6.string.from-code-point {"ie":"10"}
+  es6.string.code-point-at {"ie":"10"}
+  es6.string.repeat {"ie":"10"}
+  es6.string.starts-with {"ie":"10"}
+  es6.string.ends-with {"ie":"10"}
+  es6.string.includes {"ie":"10"}
+  es6.regexp.flags {"electron":"0.36","ie":"10"}
+  es6.regexp.match {"electron":"0.36","ie":"10"}
+  es6.regexp.replace {"electron":"0.36","ie":"10"}
+  es6.regexp.split {"electron":"0.36","ie":"10"}
+  es6.regexp.search {"electron":"0.36","ie":"10"}
+  es6.array.from {"electron":"0.36","node":"6.1","ie":"10"}
+  es6.array.of {"ie":"10"}
+  es6.array.copy-within {"ie":"10"}
+  es6.array.find {"ie":"10"}
+  es6.array.find-index {"ie":"10"}
+  es6.array.fill {"ie":"10"}
+  es6.array.iterator {"ie":"10"}
+  es6.number.is-finite {"ie":"10"}
+  es6.number.is-integer {"ie":"10"}
+  es6.number.is-safe-integer {"ie":"10"}
+  es6.number.is-nan {"ie":"10"}
+  es6.number.epsilon {"ie":"10"}
+  es6.number.min-safe-integer {"ie":"10"}
+  es6.number.max-safe-integer {"ie":"10"}
+  es6.math.acosh {"ie":"10"}
+  es6.math.asinh {"ie":"10"}
+  es6.math.atanh {"ie":"10"}
+  es6.math.cbrt {"ie":"10"}
+  es6.math.clz32 {"ie":"10"}
+  es6.math.cosh {"ie":"10"}
+  es6.math.expm1 {"ie":"10"}
+  es6.math.fround {"ie":"10"}
+  es6.math.hypot {"ie":"10"}
+  es6.math.imul {"ie":"10"}
+  es6.math.log1p {"ie":"10"}
+  es6.math.log10 {"ie":"10"}
+  es6.math.log2 {"ie":"10"}
+  es6.math.sign {"ie":"10"}
+  es6.math.sinh {"ie":"10"}
+  es6.math.tanh {"ie":"10"}
+  es6.math.trunc {"ie":"10"}
+  es7.array.includes {"ie":"10"}
+  es7.object.values {"electron":"0.36","node":"6.1","ie":"10"}
+  es7.object.entries {"electron":"0.36","node":"6.1","ie":"10"}
+  es7.object.get-own-property-descriptors {"electron":"0.36","node":"6.1","ie":"10"}
+  es7.string.pad-start {"chrome":"54","electron":"0.36","node":"6.1","ie":"10"}
+  es7.string.pad-end {"chrome":"54","electron":"0.36","node":"6.1","ie":"10"}
+  web.timers {"chrome":"54","electron":"0.36","node":"6.1","ie":"10"}
+  web.immediate {"chrome":"54","electron":"0.36","node":"6.1","ie":"10"}
+  web.dom.iterable {"chrome":"54","electron":"0.36","node":"6.1","ie":"10"}
+src/in.js -> lib/in.js
\ No newline at end of file
diff --git a/experimental/babel-preset-env/test/debug-fixtures/versions-strings/options.json b/experimental/babel-preset-env/test/debug-fixtures/versions-strings/options.json
new file mode 100644
index 0000000000..0954a3ae1b
--- /dev/null
+++ b/experimental/babel-preset-env/test/debug-fixtures/versions-strings/options.json
@@ -0,0 +1,12 @@
+{
+  "presets": [
+    ["../../lib", {
+      "debug": true,
+      "targets": {
+        "chrome": "54",
+        "node": "6.10",
+        "ie": "10"
+      }
+    }]
+  ]
+}
diff --git a/experimental/babel-preset-env/test/debug-fixtures/versions-strings/stdout.txt b/experimental/babel-preset-env/test/debug-fixtures/versions-strings/stdout.txt
new file mode 100644
index 0000000000..a61cd69940
--- /dev/null
+++ b/experimental/babel-preset-env/test/debug-fixtures/versions-strings/stdout.txt
@@ -0,0 +1,123 @@
+babel-preset-env: `DEBUG` option
+
+Using targets:
+{
+  "chrome": "54",
+  "node": "6.10",
+  "ie": "10"
+}
+
+Modules transform: commonjs
+
+Using plugins:
+  transform-es2015-arrow-functions {"ie":"10"}
+  transform-es2015-block-scoped-functions {"ie":"10"}
+  transform-es2015-block-scoping {"ie":"10"}
+  transform-es2015-classes {"ie":"10"}
+  transform-es2015-computed-properties {"ie":"10"}
+  check-es2015-constants {"ie":"10"}
+  transform-es2015-destructuring {"ie":"10"}
+  transform-es2015-duplicate-keys {"ie":"10"}
+  transform-es2015-for-of {"ie":"10"}
+  transform-es2015-function-name {"ie":"10"}
+  transform-es2015-literals {"ie":"10"}
+  transform-es2015-object-super {"ie":"10"}
+  transform-es2015-parameters {"ie":"10"}
+  transform-es2015-shorthand-properties {"ie":"10"}
+  transform-es2015-spread {"ie":"10"}
+  transform-es2015-sticky-regex {"ie":"10"}
+  transform-es2015-template-literals {"ie":"10"}
+  transform-es2015-typeof-symbol {"ie":"10"}
+  transform-es2015-unicode-regex {"ie":"10"}
+  transform-regenerator {"ie":"10"}
+  transform-exponentiation-operator {"node":"6.10","ie":"10"}
+  transform-async-to-generator {"chrome":"54","node":"6.10","ie":"10"}
+  syntax-trailing-function-commas {"chrome":"54","node":"6.10","ie":"10"}
+
+Using polyfills:
+  es6.typed.array-buffer {"ie":"10"}
+  es6.typed.int8-array {"ie":"10"}
+  es6.typed.uint8-array {"ie":"10"}
+  es6.typed.uint8-clamped-array {"ie":"10"}
+  es6.typed.int16-array {"ie":"10"}
+  es6.typed.uint16-array {"ie":"10"}
+  es6.typed.int32-array {"ie":"10"}
+  es6.typed.uint32-array {"ie":"10"}
+  es6.typed.float32-array {"ie":"10"}
+  es6.typed.float64-array {"ie":"10"}
+  es6.map {"ie":"10"}
+  es6.set {"ie":"10"}
+  es6.weak-map {"ie":"10"}
+  es6.weak-set {"ie":"10"}
+  es6.reflect.apply {"ie":"10"}
+  es6.reflect.construct {"ie":"10"}
+  es6.reflect.define-property {"ie":"10"}
+  es6.reflect.delete-property {"ie":"10"}
+  es6.reflect.get {"ie":"10"}
+  es6.reflect.get-own-property-descriptor {"ie":"10"}
+  es6.reflect.get-prototype-of {"ie":"10"}
+  es6.reflect.has {"ie":"10"}
+  es6.reflect.is-extensible {"ie":"10"}
+  es6.reflect.own-keys {"ie":"10"}
+  es6.reflect.prevent-extensions {"ie":"10"}
+  es6.reflect.set {"ie":"10"}
+  es6.reflect.set-prototype-of {"ie":"10"}
+  es6.promise {"ie":"10"}
+  es6.symbol {"ie":"10"}
+  es6.object.assign {"ie":"10"}
+  es6.object.is {"ie":"10"}
+  es6.object.set-prototype-of {"ie":"10"}
+  es6.function.name {"ie":"10"}
+  es6.string.raw {"ie":"10"}
+  es6.string.from-code-point {"ie":"10"}
+  es6.string.code-point-at {"ie":"10"}
+  es6.string.repeat {"ie":"10"}
+  es6.string.starts-with {"ie":"10"}
+  es6.string.ends-with {"ie":"10"}
+  es6.string.includes {"ie":"10"}
+  es6.regexp.flags {"ie":"10"}
+  es6.regexp.match {"ie":"10"}
+  es6.regexp.replace {"ie":"10"}
+  es6.regexp.split {"ie":"10"}
+  es6.regexp.search {"ie":"10"}
+  es6.array.from {"ie":"10"}
+  es6.array.of {"ie":"10"}
+  es6.array.copy-within {"ie":"10"}
+  es6.array.find {"ie":"10"}
+  es6.array.find-index {"ie":"10"}
+  es6.array.fill {"ie":"10"}
+  es6.array.iterator {"ie":"10"}
+  es6.number.is-finite {"ie":"10"}
+  es6.number.is-integer {"ie":"10"}
+  es6.number.is-safe-integer {"ie":"10"}
+  es6.number.is-nan {"ie":"10"}
+  es6.number.epsilon {"ie":"10"}
+  es6.number.min-safe-integer {"ie":"10"}
+  es6.number.max-safe-integer {"ie":"10"}
+  es6.math.acosh {"ie":"10"}
+  es6.math.asinh {"ie":"10"}
+  es6.math.atanh {"ie":"10"}
+  es6.math.cbrt {"ie":"10"}
+  es6.math.clz32 {"ie":"10"}
+  es6.math.cosh {"ie":"10"}
+  es6.math.expm1 {"ie":"10"}
+  es6.math.fround {"ie":"10"}
+  es6.math.hypot {"ie":"10"}
+  es6.math.imul {"ie":"10"}
+  es6.math.log1p {"ie":"10"}
+  es6.math.log10 {"ie":"10"}
+  es6.math.log2 {"ie":"10"}
+  es6.math.sign {"ie":"10"}
+  es6.math.sinh {"ie":"10"}
+  es6.math.tanh {"ie":"10"}
+  es6.math.trunc {"ie":"10"}
+  es7.array.includes {"ie":"10"}
+  es7.object.values {"node":"6.10","ie":"10"}
+  es7.object.entries {"node":"6.10","ie":"10"}
+  es7.object.get-own-property-descriptors {"node":"6.10","ie":"10"}
+  es7.string.pad-start {"chrome":"54","node":"6.10","ie":"10"}
+  es7.string.pad-end {"chrome":"54","node":"6.10","ie":"10"}
+  web.timers {"chrome":"54","node":"6.10","ie":"10"}
+  web.immediate {"chrome":"54","node":"6.10","ie":"10"}
+  web.dom.iterable {"chrome":"54","node":"6.10","ie":"10"}
+src/in.js -> lib/in.js
\ No newline at end of file
diff --git a/experimental/babel-preset-env/test/fixtures/preset-options/electron/options.json b/experimental/babel-preset-env/test/fixtures/preset-options/electron/options.json
index ea936ce251..2e2bef018a 100644
--- a/experimental/babel-preset-env/test/fixtures/preset-options/electron/options.json
+++ b/experimental/babel-preset-env/test/fixtures/preset-options/electron/options.json
@@ -2,7 +2,7 @@
   "presets": [
     ["../../../../lib", {
       "targets": {
-        "electron": 1.4
+        "electron": "1.4"
       },
       "modules": false,
       "useBuiltIns": "entry"
diff --git a/experimental/babel-preset-env/test/fixtures/preset-options/no-transform/options.json b/experimental/babel-preset-env/test/fixtures/preset-options/no-transform/options.json
index de09fa3f05..c35fc6979c 100644
--- a/experimental/babel-preset-env/test/fixtures/preset-options/no-transform/options.json
+++ b/experimental/babel-preset-env/test/fixtures/preset-options/no-transform/options.json
@@ -2,7 +2,7 @@
   "presets": [
     ["../../../../lib", {
       "targets": {
-        "chrome": 55
+        "chrome": "55"
       },
       "modules": false,
       "useBuiltIns": true
diff --git a/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node-web/options.json b/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node-web/options.json
index 701076ff3e..b478f84ee7 100644
--- a/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node-web/options.json
+++ b/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node-web/options.json
@@ -2,8 +2,8 @@
   "presets": [
     ["../../../../lib", {
       "targets": {
-        "chrome": 55,
-        "node": 7.6,
+        "chrome": "55",
+        "node": "7.6",
         "uglify": true
       },
       "modules": false,
diff --git a/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node/options.json b/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node/options.json
index 8536be8292..002aaf86fc 100644
--- a/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node/options.json
+++ b/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-node/options.json
@@ -2,7 +2,7 @@
   "presets": [
     ["../../../../lib", {
       "targets": {
-        "node": 7.6,
+        "node": "7.6",
         "uglify": true
       },
       "modules": false,
diff --git a/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-require/options.json b/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-require/options.json
index 7c15d7db40..a31ebe2f8e 100644
--- a/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-require/options.json
+++ b/experimental/babel-preset-env/test/fixtures/preset-options/use-builtins-require/options.json
@@ -2,7 +2,7 @@
   "presets": [
     ["../../../../lib", {
       "targets": {
-        "chrome": 55
+        "chrome": "55"
       },
       "modules": false,
       "useBuiltIns": "entry"
diff --git a/experimental/babel-preset-env/test/index.spec.js b/experimental/babel-preset-env/test/index.spec.js
index c496c6f67b..d6bd903014 100644
--- a/experimental/babel-preset-env/test/index.spec.js
+++ b/experimental/babel-preset-env/test/index.spec.js
@@ -4,63 +4,11 @@ const babelPresetEnv = require("../lib/index.js");
 const assert = require("assert");
 
 describe("babel-preset-env", () => {
-  describe("getTargets", () => {
-    it("should return the current node version with option 'current'", () => {
-      assert.deepEqual(
-        babelPresetEnv.getTargets({
-          node: true,
-        }),
-        {
-          node: parseFloat(process.versions.node),
-        },
-      );
-
-      assert.deepEqual(
-        babelPresetEnv.getTargets({
-          node: "current",
-        }),
-        {
-          node: parseFloat(process.versions.node),
-        },
-      );
-    });
-  });
-
-  describe("getTargets + uglify", () => {
-    it("should work with `true`", function() {
-      assert.deepEqual(
-        babelPresetEnv.getTargets({
-          uglify: true,
-        }),
-        {
-          uglify: true,
-        },
-      );
-    });
-
-    it("should ignore `false`", function() {
-      assert.deepEqual(
-        babelPresetEnv.getTargets({
-          uglify: false,
-        }),
-        {},
-      );
-    });
-
-    it("should ignore `null`", function() {
-      assert.deepEqual(
-        babelPresetEnv.getTargets({
-          uglify: null,
-        }),
-        {},
-      );
-    });
-  });
-
   describe("isPluginRequired", () => {
+    const MAX_VERSION = `${Number.MAX_SAFE_INTEGER}.0.0`;
+
     it("returns true if no targets are specified", () => {
-      const isRequired = babelPresetEnv.isPluginRequired({}, {});
-      assert(isRequired);
+      assert.strictEqual(babelPresetEnv.isPluginRequired({}, {}), true);
     });
 
     it("returns true if plugin feature is not implemented in one or more targets", () => {
@@ -72,15 +20,21 @@ describe("babel-preset-env", () => {
       };
 
       targets = {
-        chrome: Number.MAX_SAFE_INTEGER,
-        firefox: Number.MAX_SAFE_INTEGER,
+        chrome: MAX_VERSION,
+        firefox: MAX_VERSION,
       };
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === false);
+      assert.strictEqual(
+        babelPresetEnv.isPluginRequired(targets, plugin),
+        false,
+      );
 
       targets = {
-        edge: 12,
+        edge: "12",
       };
-      assert(babelPresetEnv.isPluginRequired(plugin, plugin) === true);
+      assert.strictEqual(
+        babelPresetEnv.isPluginRequired(targets, plugin),
+        true,
+      );
     });
 
     it("returns false if plugin feature is implemented by lower than target", () => {
@@ -88,9 +42,13 @@ describe("babel-preset-env", () => {
         chrome: 49,
       };
       const targets = {
-        chrome: Number.MAX_SAFE_INTEGER,
+        chrome: MAX_VERSION,
       };
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === false);
+
+      assert.strictEqual(
+        babelPresetEnv.isPluginRequired(targets, plugin),
+        false,
+      );
     });
 
     it("returns false if plugin feature is implemented is equal to target", () => {
@@ -98,9 +56,12 @@ describe("babel-preset-env", () => {
         chrome: 49,
       };
       const targets = {
-        chrome: 49,
+        chrome: "49.0.0",
       };
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === false);
+      assert.strictEqual(
+        babelPresetEnv.isPluginRequired(targets, plugin),
+        false,
+      );
     });
 
     it("returns true if plugin feature is implemented is greater than target", () => {
@@ -108,41 +69,12 @@ describe("babel-preset-env", () => {
         chrome: 50,
       };
       const targets = {
-        chrome: 49,
+        chrome: "49.0.0",
       };
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === true);
-    });
-
-    it("returns false if plugin feature is implemented by lower than target defined in browsers query", () => {
-      const plugin = {
-        chrome: 49,
-      };
-      const targets = {
-        browsers: "chrome > 50",
-      };
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === false);
-    });
-
-    it("returns true if plugin feature is implemented is greater than target defined in browsers query", () => {
-      const plugin = {
-        chrome: 52,
-      };
-      const targets = {
-        browsers: "chrome > 50",
-      };
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === true);
-    });
-
-    it("returns true if target's root items overrides versions defined in browsers query", () => {
-      const plugin = {
-        chrome: 45,
-      };
-      const targets = {
-        browsers: "last 2 Chrome versions",
-        chrome: 44,
-      };
-
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === true);
+      assert.strictEqual(
+        babelPresetEnv.isPluginRequired(targets, plugin),
+        true,
+      );
     });
 
     it("returns true if uglify is specified as a target", () => {
@@ -150,46 +82,37 @@ describe("babel-preset-env", () => {
         chrome: 50,
       };
       const targets = {
-        chrome: 55,
+        chrome: "55.0.0",
         uglify: true,
       };
-
-      assert(babelPresetEnv.isPluginRequired(targets, plugin) === true);
-    });
-
-    it("doesn't throw when specifying a decimal for node", () => {
-      const plugin = {
-        node: 6,
-      };
-
-      const targets = {
-        node: 6.5,
-      };
-
-      assert.doesNotThrow(
-        () => {
-          babelPresetEnv.isPluginRequired(targets, plugin);
-        },
-        Error,
+      assert.strictEqual(
+        babelPresetEnv.isPluginRequired(targets, plugin),
+        true,
       );
     });
 
-    it("will throw if target version is not a number", () => {
+    it("returns when target is a decimal", () => {
       const plugin = {
-        node: 6,
+        node: 6.9,
       };
-
       const targets = {
-        node: "6.5",
+        node: "6.10.0",
       };
-
-      assert.throws(
-        () => {
-          babelPresetEnv.isPluginRequired(targets, plugin);
-        },
-        Error,
+      assert.strictEqual(
+        babelPresetEnv.isPluginRequired(targets, plugin),
+        false,
       );
     });
+
+    it("throws an error if target version is invalid", () => {
+      const plugin = {
+        chrome: 50,
+      };
+      const targets = {
+        chrome: 55,
+      };
+      assert.throws(() => babelPresetEnv.isPluginRequired(targets, plugin));
+    });
   });
 
   describe("transformIncludesAndExcludes", () => {
diff --git a/experimental/babel-preset-env/test/targets-parser.spec.js b/experimental/babel-preset-env/test/targets-parser.spec.js
new file mode 100644
index 0000000000..ff569174b7
--- /dev/null
+++ b/experimental/babel-preset-env/test/targets-parser.spec.js
@@ -0,0 +1,117 @@
+import assert from "assert";
+import getTargets from "../src/targets-parser";
+
+describe("getTargets", () => {
+  it("parses", () => {
+    assert.deepEqual(
+      getTargets({
+        chrome: 49,
+        firefox: "55",
+        ie: "9",
+        node: "6.10",
+        electron: "1.6",
+      }),
+      {
+        chrome: "49.0.0",
+        electron: "1.6.0",
+        firefox: "55.0.0",
+        ie: "9.0.0",
+        node: "6.10.0",
+      },
+    );
+  });
+
+  describe("browser", () => {
+    it("merges browser key targets", () => {
+      assert.deepEqual(
+        getTargets({
+          browsers: "chrome 56, ie 11, firefox 51, safari 9",
+          chrome: "49",
+          firefox: "55",
+          ie: "9",
+        }),
+        {
+          chrome: "49.0.0",
+          firefox: "51.0.0",
+          ie: "9.0.0",
+          safari: "9.0.0",
+        },
+      );
+    });
+
+    it("ignores invalid", () => {
+      assert.deepEqual(
+        getTargets({
+          browsers: 59,
+          chrome: "49",
+          firefox: "55",
+          ie: "11",
+        }),
+        {
+          chrome: "49.0.0",
+          firefox: "55.0.0",
+          ie: "11.0.0",
+        },
+      );
+    });
+  });
+
+  describe("node", () => {
+    it("should return the current node version with option 'current'", () => {
+      assert.deepEqual(
+        getTargets({
+          node: true,
+        }),
+        {
+          node: process.versions.node,
+        },
+      );
+    });
+  });
+
+  describe("electron", () => {
+    it("should be its own target", () => {
+      assert.deepEqual(
+        getTargets({
+          chrome: "46",
+          electron: "0.34",
+        }),
+        {
+          chrome: "46.0.0",
+          electron: "0.34.0",
+        },
+      );
+    });
+  });
+
+  describe("uglify", () => {
+    it("should work with `true`", function() {
+      assert.deepEqual(
+        getTargets({
+          uglify: true,
+        }),
+        {
+          uglify: true,
+        },
+      );
+    });
+
+    it("should ignore `false`", function() {
+      assert.deepEqual(
+        getTargets({
+          uglify: false,
+        }),
+        {},
+      );
+    });
+
+    it("should ignore `null`", function() {
+      assert.deepEqual(
+        getTargets({
+          uglify: null,
+        }),
+        {},
+      );
+    });
+  });
+});
diff --git a/experimental/babel-preset-env/test/utils.spec.js b/experimental/babel-preset-env/test/utils.spec.js
new file mode 100644
index 0000000000..d4d5162b81
--- /dev/null
+++ b/experimental/babel-preset-env/test/utils.spec.js
@@ -0,0 +1,61 @@
+"use strict";
+
+const utils = require("../lib/utils");
+const assert = require("assert");
+
+const {
+  prettifyTargets,
+  prettifyVersion,
+  semverify,
+} = utils;
+
+describe("utils", () => {
+  describe("semverify", () => {
+    it("returns", () => {
+      assert.strictEqual(semverify("1"), "1.0.0");
+      assert.strictEqual(semverify("1.0"), "1.0.0");
+      assert.strictEqual(semverify("1.0.0"), "1.0.0");
+      assert.strictEqual(semverify(1), "1.0.0");
+      assert.strictEqual(semverify(1.2), "1.2.0");
+    });
+  });
+
+  describe("prettifyVersion", () => {
+    it("returns", () => {
+      assert.strictEqual(prettifyVersion(true), true);
+      assert.strictEqual(prettifyVersion("0.16.0"), "0.16");
+      assert.strictEqual(prettifyVersion("1.0.0"), "1");
+      assert.strictEqual(prettifyVersion("1.1.0"), "1.1");
+      assert.strictEqual(prettifyVersion("1.0.2"), "1.0.2");
+      assert.strictEqual(prettifyVersion("1.2.3"), "1.2.3");
+    });
+  });
+
+  describe("prettifyTargets", () => {
+    it("returns", () => {
+      assert.deepStrictEqual(prettifyTargets({}), {});
+
+      assert.deepStrictEqual(
+        prettifyTargets({
+          uglify: true,
+        }),
+        {
+          uglify: true,
+        },
+      );
+
+      assert.deepStrictEqual(
+        prettifyTargets({
+          chrome: "54.0.0",
+          electron: "1.6.0",
+          node: "0.12.0",
+        }),
+        {
+          chrome: "54",
+          electron: "1.6",
+          node: "0.12",
+        },
+      );
+    });
+  });
+});