Move all runtime helpers to individual files (#16495)

* Move all runtime helpers to individual files

* Regenerate babel-runtime

* Update fixtures

* Make errors for bugs in helpers more helpful (and not "this.hub is undefined")

* Wrap Babel 7 helpers in !BABEL_8_BREAKING

* Skip failing decorators tests in Babel7/8

* Disable most CI

* Skip failing Babel 7 old class helpers test in Babel 8

* Use latest decorators version in metadata test

* Revert "Disable most CI"

This reverts commit b98b0dc.

packages/babel-cli/test/fixtures/babel-external-helpers/--whitelist/stdout.txt

@@ -1,21 +1,15 @@
 (function (global) {
  var babelHelpers = global.babelHelpers = {};
- function _defineProperties(target, props) {
- for (var i = 0; i < props.length; i++) {
- var descriptor = props[i];
- descriptor.enumerable = descriptor.enumerable || false;
- descriptor.configurable = true;
- if ("value" in descriptor) descriptor.writable = true;
- Object.defineProperty(target, babelHelpers.toPropertyKey(descriptor.key), descriptor);
+ function _defineProperties(e, r) {
+ for (var t = 0; t < r.length; t++) {
+ var o = r[t];
+ o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, babelHelpers.toPropertyKey(o.key), o);
  }
  }
- function _createClass(Constructor, protoProps, staticProps) {
- if (protoProps) _defineProperties(Constructor.prototype, protoProps);
- if (staticProps) _defineProperties(Constructor, staticProps);
- Object.defineProperty(Constructor, "prototype", {
- writable: false
- });
- return Constructor;
+ function _createClass(e, r, t) {
+ return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", {
+ writable: !1
+ }), e;
  }
  babelHelpers.createClass = _createClass;
 })(typeof global === "undefined" ? self : global);

packages/babel-helpers/scripts/generate-helpers.js

@@ -17,17 +17,27 @@ export default async function generateHelpers() {
  */
 
 import template from "@babel/template";
+import type * as t from "@babel/types";
 
-function helper(minVersion: string, source: string) {
+interface Helper {
+ minVersion: string;
+ ast: () => t.Program;
+}
+
+function helper(minVersion: string, source: string): Helper {
  return Object.freeze({
  minVersion,
  ast: () => template.program.ast(source, { preserveComments: true }),
  })
 }
 
-export default Object.freeze({
+export { helpers as default };
+const helpers: Record<string, Helper> = {
+ __proto__: null,
 `;
 
+ let babel7extraOutput = "";
+
  for (const file of (await fs.promises.readdir(HELPERS_FOLDER)).sort()) {
  if (IGNORED_FILES.has(file)) continue;
  if (file.startsWith(".")) continue; // ignore e.g. vim swap files
@@ -51,10 +61,7 @@ export default Object.freeze({
  }
  const { minVersion } = minVersionMatch.groups;
 
- if (IS_BABEL_8() && code.includes("@onlyBabel7")) {
- continue;
- }
-
+ const onlyBabel7 = code.includes("@onlyBabel7");
  const mangleFns = code.includes("@mangleFns");
  const noMangleFns = [];
 
@@ -114,15 +121,33 @@ export default Object.freeze({
  })
  ).code;
 
- output += `\
+ const helperStr = `\
  // size: ${code.length}, gzip size: ${gzipSync(code).length}
  ${JSON.stringify(helperName)}: helper(
  ${JSON.stringify(minVersion)},
  ${JSON.stringify(code)},
  ),
+`;
+
+ if (onlyBabel7) {
+ if (!IS_BABEL_8()) babel7extraOutput += helperStr;
+ } else {
+ output += helperStr;
+ }
+ }
+
+ output += "};";
+
+ if (babel7extraOutput) {
+ output += `
+
+if (!process.env.BABEL_8_BREAKING) {
+ Object.assign(helpers, {
+ ${babel7extraOutput}
+ });
+}
 `;
  }
 
- output += "});";
  return output;
 }