Remove the resolveModuleSource options.

packages/babel-core/src/config/option-manager.js

@@ -57,7 +57,6 @@ const optionNames = new Set([
   "sourceType",
   "auxiliaryCommentBefore",
   "auxiliaryCommentAfter",
-  "resolveModuleSource",
   "getModuleId",
   "moduleRoot",
   "moduleIds",
@@ -450,9 +449,10 @@ function normalizeOptions(config) {
     // check for an unknown option
     if (!optionNames.has(key)) {
       if (removed[key]) {
+        const { message, version = 5 } = removed[key];
+
         throw new ReferenceError(
-          `Using removed Babel 5 option: ${alias}.${key} - ${removed[key]
-            .message}`,
+          `Using removed Babel ${version} option: ${alias}.${key} - ${message}`,
         );
       } else {
         // eslint-disable-next-line max-len

packages/babel-core/src/config/removed.js

@@ -56,4 +56,9 @@ export default {
   whitelist: {
     message: "Put the specific transforms you want in the `plugins` option",
   },
+
+  resolveModuleSource: {
+    version: 6,
+    message: "Use `babel-plugin-module-resolver@3`'s 'resolvePath' options",
+  },
 };

packages/babel-core/src/transformation/file/index.js

@@ -166,11 +166,9 @@ export default class File {
     }
   }
 
+  // TODO: Remove this before 7.x's official release. Leaving it in for now to
+  // prevent unnecessary breakage between beta versions.
   resolveModuleSource(source: string): string {
-    const resolveModuleSource = this.opts.resolveModuleSource;
-    if (resolveModuleSource) {
-      source = resolveModuleSource(source, this.opts.filename);
-    }
     return source;
   }