Use require.resolve instead of the resolve package

babel.config.js

@@ -21,6 +21,7 @@ module.exports = function (api) {
   let convertESM = true;
   let ignoreLib = true;
   let includeRegeneratorRuntime = false;
+  let polyfillRequireResolve = false;
 
   let transformRuntimeOptions;
 
@@ -53,13 +54,15 @@ module.exports = function (api) {
         "packages/babel-compat-data"
       );
       if (env === "rollup") envOpts.targets = { node: nodeVersion };
+      polyfillRequireResolve = true;
       break;
     case "test-legacy": // In test-legacy environment, we build babel on latest node but test on minimum supported legacy versions
     case "production":
       // Config during builds before publish.
       envOpts.targets = {
         node: nodeVersion,
       };
+      polyfillRequireResolve = true;
       break;
     case "development":
       envOpts.debug = true;
@@ -116,6 +119,7 @@ module.exports = function (api) {
 
       convertESM ? "@babel/proposal-export-namespace-from" : null,
       convertESM ? "@babel/transform-modules-commonjs" : null,
+      polyfillRequireResolve && pluginPolyfillRequireResolve,
     ].filter(Boolean),
     overrides: [
       {
@@ -160,3 +164,43 @@ module.exports = function (api) {
 
   return config;
 };
+
+// TODO(Babel 8) This polyfill is only needed for Node.js 6 and 8
+function pluginPolyfillRequireResolve({ template, types: t }) {
+  return {
+    visitor: {
+      MemberExpression(path) {
+        if (!path.matchesPattern("require.resolve")) return;
+        if (!t.isCallExpression(path.parent, { callee: path.node })) return;
+
+        const args = path.parent.arguments;
+        if (args.length < 2) return;
+        if (
+          !t.isObjectExpression(args[1]) ||
+          args[1].properties.length !== 1 ||
+          !t.isIdentifier(args[1].properties[0].key, { name: "paths" }) ||
+          !t.isArrayExpression(args[1].properties[0].value) ||
+          args[1].properties[0].value.elements.length !== 1
+        ) {
+          throw path.parentPath.buildCodeFrameError(
+            "This 'require.resolve' usage is not supported by the inline polyfill."
+          );
+        }
+
+        // require.resolve's paths option has been introduced in Node.js 8.9
+        // https://nodejs.org/api/modules.html#modules_require_resolve_request_options
+        path.replaceWith(template.ast`
+          parseFloat(process.versions.node) >= 8.9
+            ? require.resolve
+            : (/* request */ r, { paths: [/* base */ b] }, M = require("module")) => {
+                let /* filename */ f = M._findPath(r, M._nodeModulePaths(b).concat(b));
+                if (f) return f;
+                f = new Error(\`Cannot resolve module '\${r}'\`);
+                f.code = "MODULE_NOT_FOUND";
+                throw f;
+              }
+        `);
+      },
+    },
+  };
+}

lib/third-party-libs.js.flow

@@ -6,12 +6,11 @@ declare module "debug" {
   declare export default (namespace: string) => (formatter: string, ...args: any[]) => void;
 }
 
-declare module "resolve" {
-  declare export default {
-    (string, {| basedir: string |}, (err: ?Error, res: string) => void): void;
-    sync: (string, {| basedir: string |}) => string;
-  };
-}
+declare var require: {
+  resolve(specifier: string, opts?: {
+    paths: string[]
+  }): string,
+};
 
 declare module "json5" {
   declare export default {

packages/babel-core/package.json

@@ -56,7 +56,6 @@
     "gensync": "^1.0.0-beta.1",
     "json5": "^2.1.2",
     "lodash": "^4.17.19",
-    "resolve": "^1.3.2",
     "semver": "^5.4.1",
     "source-map": "^0.5.0"
   },

packages/babel-core/src/config/files/configuration.js

@@ -17,7 +17,6 @@ import type { FilePackageData, RelativeConfig, ConfigFile } from "./types";
 import type { CallerMetadata } from "../validation/options";
 
 import * as fs from "../../gensync-utils/fs";
-import resolve from "../../gensync-utils/resolve";
 
 const debug = buildDebug("babel:config:loading:files:configuration");
 
@@ -136,7 +135,7 @@ export function* loadConfig(
   envName: string,
   caller: CallerMetadata | void,
 ): Handler<ConfigFile> {
-  const filepath = yield* resolve(name, { basedir: dirname });
+  const filepath = require.resolve(name, { paths: [dirname] });
 
   const conf = yield* readConfig(filepath, envName, caller);
   if (!conf) {

packages/babel-core/src/config/files/plugins.js

@@ -5,7 +5,6 @@
  */
 
 import buildDebug from "debug";
-import resolve from "resolve";
 import path from "path";
 
 const debug = buildDebug("babel:config:loading:files:plugins");
@@ -96,14 +95,18 @@ function resolveStandardizedName(
   const standardizedName = standardizeName(type, name);
 
   try {
-    return resolve.sync(standardizedName, { basedir: dirname });
+    return require.resolve(standardizedName, {
+      paths: [dirname],
+    });
   } catch (e) {
     if (e.code !== "MODULE_NOT_FOUND") throw e;
 
     if (standardizedName !== name) {
       let resolvedOriginal = false;
       try {
-        resolve.sync(name, { basedir: dirname });
+        require.resolve(name, {
+          paths: [dirname],
+        });
         resolvedOriginal = true;
       } catch {}
 
@@ -114,8 +117,8 @@ function resolveStandardizedName(
 
     let resolvedBabel = false;
     try {
-      resolve.sync(standardizeName(type, "@babel/" + name), {
-        basedir: dirname,
+      require.resolve(standardizeName(type, "@babel/" + name), {
+        paths: [dirname],
       });
       resolvedBabel = true;
     } catch {}
@@ -127,7 +130,9 @@ function resolveStandardizedName(
     let resolvedOppositeType = false;
     const oppositeType = type === "preset" ? "plugin" : "preset";
     try {
-      resolve.sync(standardizeName(oppositeType, name), { basedir: dirname });
+      require.resolve(standardizeName(oppositeType, name), {
+        paths: [dirname],
+      });
       resolvedOppositeType = true;
     } catch {}
 

packages/babel-core/test/api.js

@@ -144,13 +144,13 @@ describe("parser and generator options", function () {
 describe("api", function () {
   it("exposes the resolvePlugin method", function () {
     expect(() => babel.resolvePlugin("nonexistent-plugin")).toThrow(
-      /Cannot find module 'babel-plugin-nonexistent-plugin'/,
+      /Cannot resolve module 'babel-plugin-nonexistent-plugin'/,
     );
   });
 
   it("exposes the resolvePreset method", function () {
     expect(() => babel.resolvePreset("nonexistent-preset")).toThrow(
-      /Cannot find module 'babel-preset-nonexistent-preset'/,
+      /Cannot resolve module 'babel-preset-nonexistent-preset'/,
     );
   });
 

packages/babel-core/test/resolution.js

@@ -344,7 +344,7 @@ describe("addon resolution", function () {
         presets: ["foo"],
       });
     }).toThrow(
-      /Cannot find module 'babel-preset-foo'.*\n- If you want to resolve "foo", use "module:foo"/,
+      /Cannot resolve module 'babel-preset-foo'.*\n- If you want to resolve "foo", use "module:foo"/,
     );
   });
 
@@ -358,7 +358,7 @@ describe("addon resolution", function () {
         plugins: ["foo"],
       });
     }).toThrow(
-      /Cannot find module 'babel-plugin-foo'.*\n- If you want to resolve "foo", use "module:foo"/,
+      /Cannot resolve module 'babel-plugin-foo'.*\n- If you want to resolve "foo", use "module:foo"/,
     );
   });
 
@@ -372,7 +372,7 @@ describe("addon resolution", function () {
         presets: ["foo"],
       });
     }).toThrow(
-      /Cannot find module 'babel-preset-foo'.*\n- Did you mean "@babel\/foo"\?/,
+      /Cannot resolve module 'babel-preset-foo'.*\n- Did you mean "@babel\/foo"\?/,
     );
   });
 
@@ -386,7 +386,7 @@ describe("addon resolution", function () {
         plugins: ["foo"],
       });
     }).toThrow(
-      /Cannot find module 'babel-plugin-foo'.*\n- Did you mean "@babel\/foo"\?/,
+      /Cannot resolve module 'babel-plugin-foo'.*\n- Did you mean "@babel\/foo"\?/,
     );
   });
 
@@ -400,7 +400,7 @@ describe("addon resolution", function () {
         presets: ["testplugin"],
       });
     }).toThrow(
-      /Cannot find module 'babel-preset-testplugin'.*\n- Did you accidentally pass a plugin as a preset\?/,
+      /Cannot resolve module 'babel-preset-testplugin'.*\n- Did you accidentally pass a plugin as a preset\?/,
     );
   });
 
@@ -414,7 +414,7 @@ describe("addon resolution", function () {
         plugins: ["testpreset"],
       });
     }).toThrow(
-      /Cannot find module 'babel-plugin-testpreset'.*\n- Did you accidentally pass a preset as a plugin\?/,
+      /Cannot resolve module 'babel-plugin-testpreset'.*\n- Did you accidentally pass a preset as a plugin\?/,
     );
   });
 
@@ -427,7 +427,7 @@ describe("addon resolution", function () {
         babelrc: false,
         presets: ["foo"],
       });
-    }).toThrow(/Cannot find module 'babel-preset-foo'/);
+    }).toThrow(/Cannot resolve module 'babel-preset-foo'/);
   });
 
   it("should throw about missing plugins", function () {
@@ -439,6 +439,6 @@ describe("addon resolution", function () {
         babelrc: false,
         plugins: ["foo"],
       });
-    }).toThrow(/Cannot find module 'babel-plugin-foo'/);
+    }).toThrow(/Cannot resolve module 'babel-plugin-foo'/);
   });
 });

packages/babel-helper-transform-fixture-test-runner/package.json

@@ -23,7 +23,6 @@
     "jest-diff": "^24.8.0",
     "lodash": "^4.17.19",
     "quick-lru": "5.1.0",
-    "resolve": "^1.3.2",
     "source-map": "^0.5.0"
   }
 }

packages/babel-helper-transform-fixture-test-runner/src/index.js

@@ -7,7 +7,6 @@ import { codeFrameColumns } from "@babel/code-frame";
 import escapeRegExp from "lodash/escapeRegExp";
 import * as helpers from "./helpers";
 import merge from "lodash/merge";
-import resolve from "resolve";
 import assert from "assert";
 import fs from "fs";
 import path from "path";
@@ -107,8 +106,8 @@ function runModuleInTestContext(
   context: Context,
   moduleCache: Object,
 ) {
-  const filename = resolve.sync(id, {
-    basedir: path.dirname(relativeFilename),
+  const filename = require.resolve(id, {
+    paths: [path.dirname(relativeFilename)],
   });
 
   // Expose Node-internal modules if the tests want them. Note, this will not execute inside

packages/babel-node/package.json

@@ -29,7 +29,6 @@
     "lodash": "^4.17.19",
     "node-environment-flags": "^1.0.5",
     "regenerator-runtime": "^0.13.4",
-    "resolve": "^1.13.1",
     "v8flags": "^3.1.1"
   },
   "peerDependencies": {

packages/babel-node/src/_babel-node.js

@@ -8,7 +8,6 @@ import vm from "vm";
 import "core-js/stable";
 import "regenerator-runtime/runtime";
 import register from "@babel/register";
-import resolve from "resolve";
 
 import pkg from "../package.json";
 
@@ -209,8 +208,8 @@ if (program.eval || program.print) {
 // We have to handle require ourselves, as we want to require it in the context of babel-register
 function requireArgs() {
   if (program.require) {
-    require(resolve.sync(program.require, {
-      basedir: process.cwd(),
+    require(require.resolve(program.require, {
+      paths: [process.cwd()],
     }));
   }
 }

packages/babel-plugin-transform-block-scoping/test/fixtures/general/issue-10339/exec.js

@@ -15,7 +15,7 @@ let functionPath;
 transform(code, {
   configFile: false,
   plugins: [
-    "../../../../lib",
+    __dirname + "/../../../../lib",
     {
       post({ path }) {
         programPath = path;

packages/babel-plugin-transform-runtime/package.json

@@ -22,7 +22,6 @@
   "dependencies": {
     "@babel/helper-module-imports": "workspace:^7.12.1",
     "@babel/helper-plugin-utils": "workspace:^7.10.4",
-    "resolve": "^1.8.1",
     "semver": "^5.5.1"
   },
   "peerDependencies": {

packages/babel-plugin-transform-runtime/src/get-runtime-path/index.js

@@ -1,5 +1,4 @@
 import path from "path";
-import resolve from "resolve";
 
 export default function (moduleName, dirname, absoluteRuntime) {
   if (absoluteRuntime === false) return moduleName;
@@ -13,7 +12,9 @@ export default function (moduleName, dirname, absoluteRuntime) {
 function resolveAbsoluteRuntime(moduleName: string, dirname: string) {
   try {
     return path
-      .dirname(resolve.sync(`${moduleName}/package.json`, { basedir: dirname }))
+      .dirname(
+        require.resolve(`${moduleName}/package.json`, { paths: [dirname] }),
+      )
       .replace(/\\/g, "/");
   } catch (err) {
     if (err.code !== "MODULE_NOT_FOUND") throw err;

packages/babel-plugin-transform-runtime/test/fixtures/absoluteRuntime/true-corejs3-proposals/output.js

@@ -1,6 +1,6 @@
-var _regeneratorRuntime = require("<CWD>/node_modules/@babel/runtime-corejs3/regenerator");
+var _regeneratorRuntime = require("<CWD>/packages/babel-runtime-corejs3/regenerator");
 
-var _mapInstanceProperty = require("<CWD>/node_modules/@babel/runtime-corejs3/core-js/instance/map");
+var _mapInstanceProperty = require("<CWD>/packages/babel-runtime-corejs3/core-js/instance/map");
 
 var _marked = /*#__PURE__*/_regeneratorRuntime.mark(makeIterator);
 

packages/babel-plugin-transform-runtime/test/fixtures/absoluteRuntime/true-corejs3-stable/output.js

@@ -1,6 +1,6 @@
-var _regeneratorRuntime = require("<CWD>/node_modules/@babel/runtime-corejs3/regenerator");
+var _regeneratorRuntime = require("<CWD>/packages/babel-runtime-corejs3/regenerator");
 
-var _mapInstanceProperty = require("<CWD>/node_modules/@babel/runtime-corejs3/core-js-stable/instance/map");
+var _mapInstanceProperty = require("<CWD>/packages/babel-runtime-corejs3/core-js-stable/instance/map");
 
 var _marked = /*#__PURE__*/_regeneratorRuntime.mark(makeIterator);
 

packages/babel-plugin-transform-runtime/test/fixtures/absoluteRuntime/true/output.js

@@ -1,4 +1,4 @@
-var _classCallCheck = require("<CWD>/packages/babel-plugin-transform-runtime/node_modules/@babel/runtime/helpers/classCallCheck");
+var _classCallCheck = require("<CWD>/packages/babel-runtime/helpers/classCallCheck");
 
 let Foo = function Foo() {
   "use strict";

packages/babel-plugin-transform-runtime/test/fixtures/windows/absoluteRuntime/output.js

@@ -1,4 +1,4 @@
-var _asyncToGenerator = require("<CWD>/packages/babel-plugin-transform-runtime/node_modules/@babel/runtime/helpers/asyncToGenerator");
+var _asyncToGenerator = require("<CWD>/packages/babel-runtime/helpers/asyncToGenerator");
 
 function test() {
   return _test.apply(this, arguments);

packages/babel-plugin-transform-typeof-symbol/package.json

@@ -26,7 +26,6 @@
     "@babel/helper-plugin-test-runner": "workspace:*",
     "@babel/runtime": "workspace:*",
     "@babel/runtime-corejs2": "workspace:*",
-    "@babel/runtime-corejs3": "workspace:*",
-    "resolve": "^1.15.0"
+    "@babel/runtime-corejs3": "workspace:*"
   }
 }