Avoid importing .json files

.eslintrc.cjs

@@ -43,7 +43,9 @@ module.exports = {
         "@babel/development/no-undefined-identifier": "error",
         "@babel/development/no-deprecated-clone": "error",
         "guard-for-in": "error",
+        "import/extensions": ["error", { json: "always", cjs: "always" }],
       },
+      globals: { PACKAGE_JSON: "readonly" },
     },
     {
       files: [
@@ -63,6 +65,7 @@ module.exports = {
         "jest/no-standalone-expect": "off",
         "jest/no-test-callback": "off",
         "jest/valid-describe": "off",
+        "import/extensions": ["error", { json: "always", cjs: "always" }],
       },
     },
     {

.flowconfig

@@ -17,6 +17,7 @@ lib/third-party-libs.js.flow
 lib/preset-modules.js.flow
 packages/babel-types/lib/index.js.flow
 lib/babel-packages.js.flow
+lib/package-json.js.flow
 
 [options]
 include_warnings=true

babel.config.js

@@ -1,9 +1,10 @@
 "use strict";
 
-const path = require("path");
+const pathUtils = require("path");
+const fs = require("fs");
 
 function normalize(src) {
-  return src.replace(/\//, path.sep);
+  return src.replace(/\//, pathUtils.sep);
 }
 
 module.exports = function (api) {
@@ -125,6 +126,8 @@ module.exports = function (api) {
       convertESM ? "@babel/proposal-export-namespace-from" : null,
       convertESM ? "@babel/transform-modules-commonjs" : null,
 
+      pluginPackageJsonMacro,
+
       process.env.STRIP_BABEL_8_FLAG && [
         pluginToggleBabel8Breaking,
         { breaking: bool(process.env.BABEL_8_BREAKING) },
@@ -319,3 +322,49 @@ function pluginToggleBabel8Breaking({ types: t }, { breaking }) {
     },
   };
 }
+
+function pluginPackageJsonMacro({ types: t }) {
+  const fnName = "PACKAGE_JSON";
+
+  return {
+    visitor: {
+      ReferencedIdentifier(path) {
+        if (path.isIdentifier({ name: fnName })) {
+          throw path.buildCodeFrameError(
+            `"${fnName}" is only supported in member expressions.`
+          );
+        }
+      },
+      MemberExpression(path) {
+        if (!path.get("object").isIdentifier({ name: fnName })) return;
+
+        if (path.node.computed) {
+          throw path.buildCodeFrameError(
+            `"${fnName}" does not support computed properties.`
+          );
+        }
+        const field = path.node.property.name;
+
+        // TODO: When dropping old Node.js versions, use require.resolve
+        // instead of looping through the folders hierarchy
+
+        let pkg;
+        for (let dir = pathUtils.dirname(this.filename); ; ) {
+          try {
+            pkg = fs.readFileSync(pathUtils.join(dir, "package.json"), "utf8");
+            break;
+          } catch (_) {}
+
+          const prev = dir;
+          dir = pathUtils.resolve(dir, "..");
+
+          // We are in the root and didn't find a package.json file
+          if (dir === prev) return;
+        }
+
+        const value = JSON.parse(pkg)[field];
+        path.replaceWith(t.valueToNode(value));
+      },
+    },
+  };
+}

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

@@ -3,7 +3,6 @@ import {
   version as babelCoreVersion,
   parseSync as babelParse,
 } from "@babel/core";
-import packageJson from "../package.json";
 import {
   normalizeBabelParseConfig,
   normalizeESLintConfig,
@@ -27,7 +26,7 @@ function baseParse(code, options) {
 
   if (!isRunningMinSupportedCoreVersion) {
     throw new Error(
-      `@babel/eslint-parser@${packageJson.version} does not support @babel/core@${babelCoreVersion}. Please upgrade to @babel/core@${minSupportedCoreVersion}.`,
+      `@babel/eslint-parser@${PACKAGE_JSON.version} does not support @babel/core@${babelCoreVersion}. Please upgrade to @babel/core@${minSupportedCoreVersion}.`,
     );
   }
 

lib/package-json.d.ts

@@ -0,0 +1,8 @@
+// NOTE: This global .d.ts file can be included with
+//    /// <reference path="../../../lib/package-json.d.ts" />
+// in .ts files using the PACKAGE_JSON macro.
+
+declare const PACKAGE_JSON: {
+  name: string;
+  version: string;
+};

lib/package-json.js.flow

@@ -0,0 +1,4 @@
+declare var PACKAGE_JSON: {
+  name: string;
+  version: string;
+};

packages/babel-cli/src/babel/options.js

@@ -6,8 +6,6 @@ import commander from "commander";
 import { version } from "@babel/core";
 import glob from "glob";
 
-import pkg from "../../package.json";
-
 // Standard Babel input configs.
 commander.option(
   "-f, --filename [filename]",
@@ -170,7 +168,7 @@ commander.option(
   "Use a specific extension for the output files",
 );
 
-commander.version(pkg.version + " (@babel/core " + version + ")");
+commander.version(PACKAGE_JSON.version + " (@babel/core " + version + ")");
 commander.usage("[options] <files ...>");
 // register an empty action handler so that commander.js can throw on
 // unknown options _after_ args

packages/babel-core/src/index.js

@@ -1,10 +1,11 @@
 // @flow
 
+export const version = PACKAGE_JSON.version;
+
 export { default as File } from "./transformation/file/file";
 export { default as buildExternalHelpers } from "./tools/build-external-helpers";
 export { resolvePlugin, resolvePreset } from "./config/files";
 
-export { version } from "../package.json";
 export { getEnv } from "./config/helpers/environment";
 
 export * as types from "@babel/types";

packages/babel-helper-compilation-targets/src/index.js

@@ -13,7 +13,6 @@ import {
 import { OptionValidator } from "@babel/helper-validator-option";
 import { browserNameMap } from "./targets";
 import { TargetNames } from "./options";
-import { name as packageName } from "../package.json";
 import type { Targets, InputTargets, Browsers, TargetsTuple } from "./types";
 
 export type { Targets, InputTargets };
@@ -23,7 +22,7 @@ export { getInclusionReasons } from "./debug";
 export { default as filterItems, isRequired } from "./filter-items";
 export { unreleasedLabels } from "./targets";
 
-const v = new OptionValidator(packageName);
+const v = new OptionValidator(PACKAGE_JSON.name);
 const browserslistDefaults = browserslist.defaults;
 
 function validateTargetNames(targets: Targets): TargetsTuple {

packages/babel-helper-compilation-targets/src/utils.js

@@ -1,13 +1,12 @@
 // @flow
 import semver from "semver";
 import { OptionValidator } from "@babel/helper-validator-option";
-import { name as packageName } from "../package.json";
 import { unreleasedLabels } from "./targets";
 import type { Target, Targets } from "./types";
 
 const versionRegExp = /^(\d+|\d+.\d+)$/;
 
-const v = new OptionValidator(packageName);
+const v = new OptionValidator(PACKAGE_JSON.name);
 
 export function semverMin(first: ?string, second: string): string {
   return first && semver.lt(first, second) ? first : second;

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

@@ -20,15 +20,15 @@ import {
   isLoose,
 } from "./features";
 
-import pkg from "../package.json";
-
 export { FEATURES, injectInitialization };
 
 // Note: Versions are represented as an integer. e.g. 7.1.5 is represented
 //       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 = PACKAGE_JSON.version
+  .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/src/index.js

@@ -8,7 +8,6 @@ import {
 } from "./features";
 import { generateRegexpuOptions } from "./util";
 
-import pkg from "../package.json";
 import { types as t } from "@babel/core";
 import annotateAsPure from "@babel/helper-annotate-as-pure";
 
@@ -29,7 +28,9 @@ function pullFlag(node, flag: RegExpFlags): void {
 //       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 = PACKAGE_JSON.version
+  .split(".")
+  .reduce((v, x) => v * 1e5 + +x, 0);
 const versionKey = "@babel/plugin-regexp-features/version";
 
 export function createRegExpFeaturePlugin({ name, feature, options = {} }) {

packages/babel-helper-member-expression-to-functions/src/index.js

@@ -1,5 +1,5 @@
 import * as t from "@babel/types";
-import { willPathCastToBoolean } from "./util.js";
+import { willPathCastToBoolean } from "./util";
 
 class AssignmentMemoiser {
   constructor() {

packages/babel-helper-validator-option/src/validator.ts

@@ -1,4 +1,4 @@
-import { findSuggestion } from "./find-suggestion.js";
+import { findSuggestion } from "./find-suggestion";
 
 export class OptionValidator {
   declare descriptor: string;

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

@@ -9,8 +9,6 @@ import "core-js/stable";
 import "regenerator-runtime/runtime";
 import register from "@babel/register";
 
-import pkg from "../package.json";
-
 const program = new commander.Command("babel-node");
 
 function collect(value, previousValue): Array<string> {
@@ -61,7 +59,7 @@ program.option(
 program.option("-w, --plugins [string]", "", collect);
 program.option("-b, --presets [string]", "", collect);
 
-program.version(pkg.version);
+program.version(PACKAGE_JSON.version);
 program.usage("[options] [ -e script | script.js ] [arguments]");
 program.parse(process.argv);
 

packages/babel-parser/src/parser/error.js

@@ -18,7 +18,7 @@ type ErrorContext = {
 
 export type ParsingError = SyntaxError & ErrorContext;
 
-export { ErrorMessages as Errors } from "./error-message.js";
+export { ErrorMessages as Errors } from "./error-message";
 
 export default class ParserError extends CommentsParser {
   // Forward-declaration: defined in tokenizer/index.js

packages/babel-parser/src/parser/expression.js

@@ -53,7 +53,7 @@ import {
   newArrowHeadScope,
   newAsyncArrowScope,
   newExpressionScope,
-} from "../util/expression-scope.js";
+} from "../util/expression-scope";
 import { Errors } from "./error";
 
 export default class ExpressionParser extends LValParser {

packages/babel-plugin-proposal-class-static-block/test/plugin-ordering.test.js

@@ -1,5 +1,5 @@
 import * as babel from "@babel/core";
-import proposalClassStaticBlock from "../lib/index.js";
+import proposalClassStaticBlock from "..";
 
 describe("plugin ordering", () => {
   it("should throw when @babel/plugin-proposal-class-static-block is after class features plugin", () => {

packages/babel-plugin-proposal-dynamic-import/src/index.js

@@ -1,6 +1,5 @@
 import { declare } from "@babel/helper-plugin-utils";
 import syntaxDynamicImport from "@babel/plugin-syntax-dynamic-import";
-import { version } from "../package.json";
 
 const SUPPORTED_MODULES = ["commonjs", "amd", "systemjs"];
 
@@ -25,7 +24,10 @@ export default declare(api => {
     inherits: syntaxDynamicImport,
 
     pre() {
-      this.file.set("@babel/plugin-proposal-dynamic-import", version);
+      this.file.set(
+        "@babel/plugin-proposal-dynamic-import",
+        PACKAGE_JSON.version,
+      );
     },
 
     visitor: {

packages/babel-plugin-proposal-optional-chaining/src/index.js

@@ -5,10 +5,7 @@ import {
 } from "@babel/helper-skip-transparent-expression-wrappers";
 import syntaxOptionalChaining from "@babel/plugin-syntax-optional-chaining";
 import { types as t, template } from "@babel/core";
-import {
-  willPathCastToBoolean,
-  findOutermostTransparentParent,
-} from "./util.js";
+import { willPathCastToBoolean, findOutermostTransparentParent } from "./util";
 
 const { ast } = template.expression;
 

packages/babel-plugin-transform-react-jsx-development/src/index.js

@@ -1,3 +1,3 @@
 /* eslint-disable @babel/development/plugin-name */
 
-export { default } from "@babel/plugin-transform-react-jsx/lib/development.js";
+export { default } from "@babel/plugin-transform-react-jsx/lib/development";

packages/babel-plugin-transform-react-jsx/src/development.js

@@ -1,4 +1,4 @@
-import createPlugin from "./create-plugin.js";
+import createPlugin from "./create-plugin";
 
 export default createPlugin({
   name: "transform-react-jsx/development",

packages/babel-plugin-transform-react-jsx/src/index.js

@@ -1,6 +1,6 @@
 /* eslint-disable @babel/development/plugin-name */
 
-import createPlugin from "./create-plugin.js";
+import createPlugin from "./create-plugin";
 
 export default createPlugin({
   name: "transform-react-jsx",

packages/babel-preset-env/src/normalize-options.js

@@ -1,13 +1,12 @@
 // @flow
-import corejs3Polyfills from "core-js-compat/data";
+import corejs3Polyfills from "core-js-compat/data.json";
 import { coerce, SemVer } from "semver";
 import corejs2Polyfills from "@babel/compat-data/corejs2-built-ins";
 import { plugins as pluginsList } from "./plugins-compat-data";
 import moduleTransformations from "./module-transformations";
 import { TopLevelOptions, ModulesOption, UseBuiltInsOption } from "./options";
 import { OptionValidator } from "@babel/helper-validator-option";
 import { defaultWebIncludes } from "./polyfills/corejs2/get-platform-specific-default";
-import { name as packageName } from "../package.json";
 
 import type {
   BuiltInsOption,
@@ -18,7 +17,7 @@ import type {
   PluginListOption,
 } from "./types";
 
-const v = new OptionValidator(packageName);
+const v = new OptionValidator(PACKAGE_JSON.name);
 
 const allPluginsList = Object.keys(pluginsList);
 

packages/babel-preset-env/src/polyfills/corejs3/entry-plugin.js

@@ -1,7 +1,7 @@
 // @flow
 
-import corejs3Polyfills from "core-js-compat/data";
-import corejsEntries from "core-js-compat/entries";
+import corejs3Polyfills from "core-js-compat/data.json";
+import corejsEntries from "core-js-compat/entries.json";
 import getModulesListForTargetVersion from "core-js-compat/get-modules-list-for-target-version";
 import { filterItems } from "@babel/helper-compilation-targets";
 import {

packages/babel-preset-env/src/polyfills/corejs3/usage-plugin.js

@@ -1,6 +1,6 @@
 // @flow
 
-import corejs3Polyfills from "core-js-compat/data";
+import corejs3Polyfills from "core-js-compat/data.json";
 import corejs3ShippedProposalsList from "@babel/compat-data/corejs3-shipped-proposals";
 import getModulesListForTargetVersion from "core-js-compat/get-modules-list-for-target-version";
 import { filterItems } from "@babel/helper-compilation-targets";

packages/babel-preset-typescript/src/index.js

@@ -1,6 +1,6 @@
 import { declare } from "@babel/helper-plugin-utils";
 import transformTypeScript from "@babel/plugin-transform-typescript";
-import normalizeOptions from "./normalize-options.js";
+import normalizeOptions from "./normalize-options";
 
 export default declare((api, opts) => {
   api.assertVersion(7);