Fixed version coercion (which would cause issues later on when babel internally checkes if this csx-version qualifies for the desired version)

eslint/babel-eslint-parser/src/index.js

@@ -7,7 +7,7 @@ import packageJson from "../package.json";
 const SUPPORTED_BABEL_VERSION_RANGE =
   packageJson.peerDependencies["@babel/core"];
 const IS_RUNNING_SUPPORTED_VERSION = semver.satisfies(
-  CURRENT_BABEL_VERSION,
+  semver.coerce(CURRENT_BABEL_VERSION).raw,
   SUPPORTED_BABEL_VERSION_RANGE,
 );
 

packages/babel-core/src/config/helpers/config-api.js

@@ -70,7 +70,7 @@ function assertVersion(range: string | number): void {
     throw new Error("Expected string or integer value.");
   }
 
-  if (semver.satisfies(coreVersion, range)) return;
+  if (semver.satisfies(semver.coerce(coreVersion).raw, range)) return;
 
   const limit = Error.stackTraceLimit;
 

packages/babel-helper-create-class-features-plugin/package.json

@@ -19,7 +19,8 @@
     "@babel/helper-optimise-call-expression": "^7.8.3",
     "@babel/helper-plugin-utils": "^7.8.3",
     "@babel/helper-replace-supers": "^7.8.3",
-    "@babel/helper-split-export-declaration": "^7.8.3"
+    "@babel/helper-split-export-declaration": "^7.8.3",
+    "semver": "^5.5.0"
   },
   "peerDependencies": {
     "@babel/core": "^7.0.0"

packages/babel-helper-create-class-features-plugin/src/index.js

@@ -1,5 +1,6 @@
 import nameFunction from "@babel/helper-function-name";
 import splitExportDeclaration from "@babel/helper-split-export-declaration";
+import semver from "semver";
 import {
   buildPrivateNamesNodes,
   buildPrivateNamesMap,
@@ -27,7 +28,10 @@ export { FEATURES, injectInitialization };
 //       as 70000100005. This method is easier than using a semver-parsing
 //       package, but it breaks if we release x.y.z where x, y or z are
 //       greater than 99_999.
-const version = pkg.version.split(".").reduce((v, x) => v * 1e5 + +x, 0);
+const version = semver
+  .coerce(pkg.version)
+  .raw.split(".")
+  .reduce((v, x) => v * 1e5 + +x, 0);
 const versionKey = "@babel/plugin-class-features/version";
 
 export function createClassFeaturePlugin({

packages/babel-helper-create-regexp-features-plugin/package.json

@@ -19,7 +19,8 @@
   ],
   "dependencies": {
     "@babel/helper-regex": "^7.8.3",
-    "regexpu-core": "^4.6.0"
+    "regexpu-core": "^4.6.0",
+    "semver": "^5.5.0"
   },
   "peerDependencies": {
     "@babel/core": "^7.0.0"

packages/babel-helper-create-regexp-features-plugin/src/index.js

@@ -1,3 +1,4 @@
+import semver from "semver";
 import rewritePattern from "regexpu-core";
 import {
   featuresKey,
@@ -16,7 +17,10 @@ import { pullFlag } from "@babel/helper-regex";
 //       as 70000100005. This method is easier than using a semver-parsing
 //       package, but it breaks if we release x.y.z where x, y or z are
 //       greater than 99_999.
-const version = pkg.version.split(".").reduce((v, x) => v * 1e5 + +x, 0);
+const version = semver
+  .coerce(pkg.version)
+  .raw.split(".")
+  .reduce((v, x) => v * 1e5 + +x, 0);
 const versionKey = "@babel/plugin-regexp-features/version";
 
 export function createRegExpFeaturePlugin({ name, feature, options = {} }) {