diff --git a/packages/babel-core/README.md b/packages/babel-core/README.md
index a845fbfdd7..ad02a68c32 100644
--- a/packages/babel-core/README.md
+++ b/packages/babel-core/README.md
@@ -116,5 +116,5 @@ Following is a table of the options you can use:
 | `sourceMaps`             | `false`              | If truthy, adds a `map` property to returned output. If set to `"inline"`, a comment with a sourceMappingURL directive is added to the bottom of the returned code. If set to `"both"` then a `map` property is returned as well as a source map comment appended. **This does not emit sourcemap files by itself!** To have sourcemaps emitted using the CLI, you must pass it the `--source-maps` option |
 | `sourceMapTarget`        | `(filenameRelative)` | Set `file` on returned source map |
 | `sourceRoot`             | `(moduleRoot)`       | The root from which all sources are relative |
-| `sourceType`             | `"module"`           | Indicate the mode the code should be parsed in. Can be either "script" or "module" |
+| `sourceType`             | `"module"`           | Indicate the mode the code should be parsed in. Can be one of "script", "module", or "unambiguous". `"unambiguous"` will make Babel attempt to _guess_, based on the presence of ES6 `import` or `export` statements. Files with ES6 `import`s and `export`s are considered `"module"` and are otherwise `"script"`. |
 | `wrapPluginVisitorMethod`| `null`               | An optional callback that can be used to wrap visitor methods. **NOTE:** This is useful for things like introspection, and not really needed for implementing anything. Called as `wrapPluginVisitorMethod(pluginAlias, visitorType, callback)`.
diff --git a/packages/babel-core/src/config/option-assertions.js b/packages/babel-core/src/config/option-assertions.js
index bc0ce7fae6..693b4fea92 100644
--- a/packages/babel-core/src/config/option-assertions.js
+++ b/packages/babel-core/src/config/option-assertions.js
@@ -46,8 +46,15 @@ export function assertSourceType(
   key: string,
   value: mixed,
 ): SourceTypeOption | void {
-  if (value !== undefined && value !== "module" && value !== "script") {
-    throw new Error(`.${key} must be "module", "script", or undefined`);
+  if (
+    value !== undefined &&
+    value !== "module" &&
+    value !== "script" &&
+    value !== "unambiguous"
+  ) {
+    throw new Error(
+      `.${key} must be "module", "script", "unambiguous", or undefined`,
+    );
   }
   return value;
 }
diff --git a/packages/babel-core/src/config/options.js b/packages/babel-core/src/config/options.js
index e47babff92..aa915cc94c 100644
--- a/packages/babel-core/src/config/options.js
+++ b/packages/babel-core/src/config/options.js
@@ -185,7 +185,7 @@ export type PluginItem = PluginTarget | [PluginTarget, {} | void];
 export type PluginList = $ReadOnlyArray<PluginItem>;
 
 export type SourceMapsOption = boolean | "inline" | "both";
-export type SourceTypeOption = "module" | "script";
+export type SourceTypeOption = "module" | "script" | "unambiguous";
 export type CompactOption = boolean | "auto";
 export type RootInputSourceMapOption = {} | boolean;
 
diff --git a/packages/babylon/README.md b/packages/babylon/README.md
index 794e9e70cb..78dd00be33 100644
--- a/packages/babylon/README.md
+++ b/packages/babylon/README.md
@@ -39,7 +39,7 @@ mind. When in doubt, use `.parse()`.
 - **allowSuperOutsideMethod**: TODO
 
 - **sourceType**: Indicate the mode the code should be parsed in. Can be
-  either `"script"` or `"module"`.
+  one of `"script"`, `"module"`, or `"unambiguous"`. Defaults to `"script"`. `"unambiguous"` will make Babylon attempt to _guess_, based on the presence of ES6 `import` or `export` statements. Files with ES6 `import`s and `export`s are considered `"module"` and are otherwise `"script"`.
 
 - **sourceFilename**: Correlate output AST nodes with their source filename.  Useful when generating code and source maps from the ASTs of multiple input files.
 
diff --git a/packages/babylon/src/index.js b/packages/babylon/src/index.js
index 882834dd47..7071a312b3 100755
--- a/packages/babylon/src/index.js
+++ b/packages/babylon/src/index.js
@@ -18,7 +18,27 @@ plugins.jsx = jsxPlugin;
 plugins.typescript = typescriptPlugin;
 
 export function parse(input: string, options?: Options): File {
-  return getParser(options, input).parse();
+  if (options && options.sourceType === "unambiguous") {
+    options = Object.assign({}, options);
+    try {
+      options.sourceType = "module";
+      const ast = getParser(options, input).parse();
+
+      // Rather than try to parse as a script first, we opt to parse as a module and convert back
+      // to a script where possible to avoid having to do a full re-parse of the input content.
+      if (!hasModuleSyntax(ast)) ast.program.sourceType = "script";
+      return ast;
+    } catch (moduleError) {
+      try {
+        options.sourceType = "script";
+        return getParser(options, input).parse();
+      } catch (scriptError) {}
+
+      throw moduleError;
+    }
+  } else {
+    return getParser(options, input).parse();
+  }
 }
 
 export function parseExpression(input: string, options?: Options): Expression {
@@ -91,3 +111,16 @@ function getParserClass(
   }
   return cls;
 }
+
+function hasModuleSyntax(ast) {
+  return ast.program.body.some(
+    child =>
+      (child.type === "ImportDeclaration" &&
+        (!child.importKind || child.importKind === "value")) ||
+      (child.type === "ExportNamedDeclaration" &&
+        (!child.exportKind || child.exportKind === "value")) ||
+      (child.type === "ExportAllDeclaration" &&
+        (!child.exportKind || child.exportKind === "value")) ||
+      child.type === "ExportDefaultDeclaration",
+  );
+}
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/actual.js b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/actual.js
new file mode 100644
index 0000000000..99bf8b9add
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/actual.js
@@ -0,0 +1 @@
+var foo = require("foo");
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/expected.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/expected.json
new file mode 100644
index 0000000000..4025a67dc6
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/expected.json
@@ -0,0 +1,138 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 25,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 25
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 25,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 25
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 25,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 25
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 24,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 24
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 7,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 7
+                },
+                "identifierName": "foo"
+              },
+              "name": "foo"
+            },
+            "init": {
+              "type": "CallExpression",
+              "start": 10,
+              "end": 24,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 10
+                },
+                "end": {
+                  "line": 1,
+                  "column": 24
+                }
+              },
+              "callee": {
+                "type": "Identifier",
+                "start": 10,
+                "end": 17,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 10
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 17
+                  },
+                  "identifierName": "require"
+                },
+                "name": "require"
+              },
+              "arguments": [
+                {
+                  "type": "StringLiteral",
+                  "start": 18,
+                  "end": 23,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 18
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 23
+                    }
+                  },
+                  "extra": {
+                    "rawValue": "foo",
+                    "raw": "\"foo\""
+                  },
+                  "value": "foo"
+                }
+              ]
+            }
+          }
+        ],
+        "kind": "var"
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/options.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/options.json
new file mode 100644
index 0000000000..e69c4497f5
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/commonjs/options.json
@@ -0,0 +1,3 @@
+{
+  "sourceType": "unambiguous"
+}
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/actual.js b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/actual.js
new file mode 100644
index 0000000000..c1d866f7a4
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/actual.js
@@ -0,0 +1,3 @@
+import type { Foo } from "bar";
+export type { Foo };
+export type * from "bar";
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/expected.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/expected.json
new file mode 100644
index 0000000000..3ae2f3a00b
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/expected.json
@@ -0,0 +1,227 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 78,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 25
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 78,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 3,
+        "column": 25
+      }
+    },
+    "sourceType": "script",
+    "body": [
+      {
+        "type": "ImportDeclaration",
+        "start": 0,
+        "end": 31,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 31
+          }
+        },
+        "specifiers": [
+          {
+            "type": "ImportSpecifier",
+            "start": 14,
+            "end": 17,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 14
+              },
+              "end": {
+                "line": 1,
+                "column": 17
+              }
+            },
+            "imported": {
+              "type": "Identifier",
+              "start": 14,
+              "end": 17,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 14
+                },
+                "end": {
+                  "line": 1,
+                  "column": 17
+                },
+                "identifierName": "Foo"
+              },
+              "name": "Foo"
+            },
+            "importKind": null,
+            "local": {
+              "type": "Identifier",
+              "start": 14,
+              "end": 17,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 14
+                },
+                "end": {
+                  "line": 1,
+                  "column": 17
+                },
+                "identifierName": "Foo"
+              },
+              "name": "Foo"
+            }
+          }
+        ],
+        "importKind": "type",
+        "source": {
+          "type": "StringLiteral",
+          "start": 25,
+          "end": 30,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 25
+            },
+            "end": {
+              "line": 1,
+              "column": 30
+            }
+          },
+          "extra": {
+            "rawValue": "bar",
+            "raw": "\"bar\""
+          },
+          "value": "bar"
+        }
+      },
+      {
+        "type": "ExportNamedDeclaration",
+        "start": 32,
+        "end": 52,
+        "loc": {
+          "start": {
+            "line": 2,
+            "column": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 20
+          }
+        },
+        "specifiers": [
+          {
+            "type": "ExportSpecifier",
+            "start": 46,
+            "end": 49,
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 14
+              },
+              "end": {
+                "line": 2,
+                "column": 17
+              }
+            },
+            "local": {
+              "type": "Identifier",
+              "start": 46,
+              "end": 49,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 14
+                },
+                "end": {
+                  "line": 2,
+                  "column": 17
+                },
+                "identifierName": "Foo"
+              },
+              "name": "Foo"
+            },
+            "exported": {
+              "type": "Identifier",
+              "start": 46,
+              "end": 49,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 14
+                },
+                "end": {
+                  "line": 2,
+                  "column": 17
+                },
+                "identifierName": "Foo"
+              },
+              "name": "Foo"
+            }
+          }
+        ],
+        "source": null,
+        "exportKind": "type",
+        "declaration": null
+      },
+      {
+        "type": "ExportAllDeclaration",
+        "start": 53,
+        "end": 78,
+        "loc": {
+          "start": {
+            "line": 3,
+            "column": 0
+          },
+          "end": {
+            "line": 3,
+            "column": 25
+          }
+        },
+        "exportKind": "type",
+        "source": {
+          "type": "StringLiteral",
+          "start": 72,
+          "end": 77,
+          "loc": {
+            "start": {
+              "line": 3,
+              "column": 19
+            },
+            "end": {
+              "line": 3,
+              "column": 24
+            }
+          },
+          "extra": {
+            "rawValue": "bar",
+            "raw": "\"bar\""
+          },
+          "value": "bar"
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/options.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/options.json
new file mode 100644
index 0000000000..cd0c1cac56
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/flow/options.json
@@ -0,0 +1,4 @@
+{
+  "sourceType": "unambiguous",
+  "plugins": ["flow"]
+}
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/actual.js b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/actual.js
new file mode 100644
index 0000000000..9ec8f63ab2
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/actual.js
@@ -0,0 +1 @@
+export * from "foo";
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/expected.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/expected.json
new file mode 100644
index 0000000000..e3e870a7bf
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/expected.json
@@ -0,0 +1,69 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 20,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 20
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 20,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 20
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "ExportAllDeclaration",
+        "start": 0,
+        "end": 20,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 20
+          }
+        },
+        "source": {
+          "type": "StringLiteral",
+          "start": 14,
+          "end": 19,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 14
+            },
+            "end": {
+              "line": 1,
+              "column": 19
+            }
+          },
+          "extra": {
+            "rawValue": "foo",
+            "raw": "\"foo\""
+          },
+          "value": "foo"
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/options.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/options.json
new file mode 100644
index 0000000000..e69c4497f5
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-all/options.json
@@ -0,0 +1,3 @@
+{
+  "sourceType": "unambiguous"
+}
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/actual.js b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/actual.js
new file mode 100644
index 0000000000..ff8b4c5632
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/actual.js
@@ -0,0 +1 @@
+export default {};
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/expected.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/expected.json
new file mode 100644
index 0000000000..5373472b0e
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/expected.json
@@ -0,0 +1,65 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 18,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 18
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 18,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 18
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "ExportDefaultDeclaration",
+        "start": 0,
+        "end": 18,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 18
+          }
+        },
+        "declaration": {
+          "type": "ObjectExpression",
+          "start": 15,
+          "end": 17,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 15
+            },
+            "end": {
+              "line": 1,
+              "column": 17
+            }
+          },
+          "properties": []
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/options.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/options.json
new file mode 100644
index 0000000000..e69c4497f5
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-default/options.json
@@ -0,0 +1,3 @@
+{
+  "sourceType": "unambiguous"
+}
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/actual.js b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/actual.js
new file mode 100644
index 0000000000..ac17756121
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/actual.js
@@ -0,0 +1 @@
+export function fn(){}
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/expected.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/expected.json
new file mode 100644
index 0000000000..01e29c42d4
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/expected.json
@@ -0,0 +1,104 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 22,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 22
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 22,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 22
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "ExportNamedDeclaration",
+        "start": 0,
+        "end": 22,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 22
+          }
+        },
+        "specifiers": [],
+        "source": null,
+        "declaration": {
+          "type": "FunctionDeclaration",
+          "start": 7,
+          "end": 22,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 22
+            }
+          },
+          "id": {
+            "type": "Identifier",
+            "start": 16,
+            "end": 18,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 16
+              },
+              "end": {
+                "line": 1,
+                "column": 18
+              },
+              "identifierName": "fn"
+            },
+            "name": "fn"
+          },
+          "generator": false,
+          "expression": false,
+          "async": false,
+          "params": [],
+          "body": {
+            "type": "BlockStatement",
+            "start": 20,
+            "end": 22,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 20
+              },
+              "end": {
+                "line": 1,
+                "column": 22
+              }
+            },
+            "body": [],
+            "directives": []
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/options.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/options.json
new file mode 100644
index 0000000000..e69c4497f5
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-export-named/options.json
@@ -0,0 +1,3 @@
+{
+  "sourceType": "unambiguous"
+}
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/actual.js b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/actual.js
new file mode 100644
index 0000000000..c0748305d5
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/actual.js
@@ -0,0 +1 @@
+import "foo";
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/expected.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/expected.json
new file mode 100644
index 0000000000..1d1c75f23e
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/expected.json
@@ -0,0 +1,70 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 13,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 13,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 13
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "ImportDeclaration",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "specifiers": [],
+        "source": {
+          "type": "StringLiteral",
+          "start": 7,
+          "end": 12,
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 12
+            }
+          },
+          "extra": {
+            "rawValue": "foo",
+            "raw": "\"foo\""
+          },
+          "value": "foo"
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file
diff --git a/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/options.json b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/options.json
new file mode 100644
index 0000000000..e69c4497f5
--- /dev/null
+++ b/packages/babylon/test/fixtures/core/sourcetype-unambiguous/module-import/options.json
@@ -0,0 +1,3 @@
+{
+  "sourceType": "unambiguous"
+}