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Gulpfile.mjs
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Gulpfile.mjs
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import path from "path";
import fs from "fs";
import { createRequire } from "module";
import { fileURLToPath } from "url";
import plumber from "gulp-plumber";
import through from "through2";
import chalk from "chalk";
import fancyLog from "fancy-log";
import filter from "gulp-filter";
import gulp from "gulp";
import { rollup } from "rollup";
import { babel as rollupBabel } from "@rollup/plugin-babel";
import rollupCommonJs from "@rollup/plugin-commonjs";
import rollupJson from "@rollup/plugin-json";
import rollupNodePolyfills from "rollup-plugin-node-polyfills";
import rollupNodeResolve from "@rollup/plugin-node-resolve";
import rollupReplace from "@rollup/plugin-replace";
import { terser as rollupTerser } from "rollup-plugin-terser";
import _rollupDts from "rollup-plugin-dts";
const { default: rollupDts } = _rollupDts;
import { Worker as JestWorker } from "jest-worker";
import glob from "glob";
import { resolve as importMetaResolve } from "import-meta-resolve";
import rollupBabelSource from "./scripts/rollup-plugin-babel-source.js";
import formatCode from "./scripts/utils/formatCode.js";
const require = createRequire(import.meta.url);
const monorepoRoot = path.dirname(fileURLToPath(import.meta.url));
const defaultPackagesGlob = "./@(codemods|packages|eslint)/*";
const defaultSourcesGlob = `${defaultPackagesGlob}/src/**/{*.js,*.cjs,!(*.d).ts}`;
const babelStandalonePluginConfigGlob =
"./packages/babel-standalone/scripts/pluginConfig.json";
const buildTypingsWatchGlob = [
"./packages/babel-types/lib/definitions/**/*.js",
"./packages/babel-types/scripts/generators/*.js",
];
/**
* map source code path to the generated artifacts path
* @example
* mapSrcToLib("packages/babel-core/src/index.js")
* // returns "packages/babel-core/lib/index.js"
* @example
* mapSrcToLib("packages/babel-template/src/index.ts")
* // returns "packages/babel-template/lib/index.js"
* @example
* mapSrcToLib("packages/babel-template/src/index.d.ts")
* // returns "packages/babel-template/lib/index.d.ts"
* @param {string} srcPath
* @returns {string}
*/
function mapSrcToLib(srcPath) {
const parts = srcPath.replace(/(?<!\.d)\.ts$/, ".js").split("/");
parts[2] = "lib";
return parts.join("/");
}
function mapToDts(packageName) {
return packageName.replace(
/(?<=\\|\/|^)(packages|eslint|codemods)(?=\\|\/)/,
"dts/$1"
);
}
function getIndexFromPackage(name) {
try {
fs.statSync(`./${name}/src/index.ts`);
return `${name}/src/index.ts`;
} catch {
return `${name}/src/index.js`;
}
}
function errorsLogger() {
return plumber({
errorHandler(err) {
fancyLog(err.stack);
},
});
}
function rename(fn) {
return through.obj(function (file, enc, callback) {
file.path = fn(file);
callback(null, file);
});
}
/**
* @param {string} generator
* @param {string} pkg
* @param {string} filename
* @param {string} message
*/
function generateHelpers(generator, dest, filename, message) {
const stream = gulp
.src(".", { base: monorepoRoot })
.pipe(errorsLogger())
.pipe(
through.obj(async (file, enc, callback) => {
const { default: generateCode } = await import(generator);
file.path = filename;
file.contents = Buffer.from(
formatCode(await generateCode(filename), dest + file.path)
);
fancyLog(`${chalk.green("✔")} Generated ${message}`);
callback(null, file);
})
)
.pipe(gulp.dest(dest, { mode: 0o644 }));
return finish(stream);
}
/**
*
* @typedef {("asserts" | "builders" | "constants" | "validators")} TypesHelperKind
* @param {TypesHelperKind} helperKind
* @param {string} filename
*/
async function generateTypeHelpers(helperKind, filename = "index.ts") {
return generateHelpers(
`./packages/babel-types/scripts/generators/${helperKind}.js`,
`./packages/babel-types/src/${helperKind}/generated/`,
filename,
`@babel/types -> ${helperKind}`
);
}
/**
*
* @typedef {("asserts" | "validators" | "virtual-types")} TraverseHelperKind
* @param {TraverseHelperKind} helperKind
*/
async function generateTraverseHelpers(helperKind) {
return generateHelpers(
`./packages/babel-traverse/scripts/generators/${helperKind}.js`,
`./packages/babel-traverse/src/path/generated/`,
`${helperKind}.ts`,
`@babel/traverse -> ${helperKind}`
);
}
async function generateRuntimeHelpers() {
return generateHelpers(
`./packages/babel-helpers/scripts/generate-helpers.js`,
`./packages/babel-helpers/src/`,
"helpers-generated.ts",
"@babel/helpers"
);
}
function generateStandalone() {
const dest = "./packages/babel-standalone/src/generated/";
return gulp
.src(babelStandalonePluginConfigGlob, { base: monorepoRoot })
.pipe(
through.obj((file, enc, callback) => {
fancyLog("Generating @babel/standalone files");
const pluginConfig = JSON.parse(file.contents);
let imports = "";
let list = "";
let allList = "";
for (const plugin of pluginConfig) {
const camelPlugin = plugin.replace(/-[a-z]/g, c =>
c[1].toUpperCase()
);
imports += `import ${camelPlugin} from "@babel/plugin-${plugin}";`;
list += `${camelPlugin},`;
allList += `"${plugin}": ${camelPlugin},`;
}
const fileContents = `/*
* This file is auto-generated! Do not modify it directly.
* To re-generate run 'yarn gulp generate-standalone'
*/
${imports}
export {${list}};
export const all: { [k: string]: any } = {${allList}};`;
file.path = "plugins.ts";
file.contents = Buffer.from(formatCode(fileContents, dest));
callback(null, file);
})
)
.pipe(gulp.dest(dest));
}
function finish(stream) {
return new Promise((resolve, reject) => {
stream.on("end", resolve);
stream.on("finish", resolve);
stream.on("error", reject);
});
}
function getFiles(glob, { include, exclude }) {
let stream = gulp.src(glob, { base: monorepoRoot });
if (exclude) {
const filters = exclude.map(p => `!**/${p}/**`);
filters.unshift("**");
stream = stream.pipe(filter(filters));
}
if (include) {
const filters = include.map(p => `**/${p}/**`);
stream = stream.pipe(filter(filters));
}
return stream;
}
function createWorker(useWorker) {
const numWorkers = require("os").cpus().length / 2 - 1;
if (numWorkers === 0 || !useWorker) {
return require("./babel-worker.cjs");
}
const worker = new JestWorker(require.resolve("./babel-worker.cjs"), {
numWorkers,
exposedMethods: ["transform"],
});
worker.getStdout().pipe(process.stdout);
worker.getStderr().pipe(process.stderr);
return worker;
}
async function buildBabel(useWorker, ignore = []) {
const worker = createWorker(useWorker);
const files = await new Promise((resolve, reject) => {
glob(
defaultSourcesGlob,
{
ignore: ignore.map(p => `./${p.src}/**`),
},
(err, files) => {
if (err) reject(err);
resolve(files);
}
);
});
const promises = [];
for (const file of files) {
// @example ./packages/babel-parser/src/index.js
const dest = "./" + mapSrcToLib(file.slice(2));
promises.push(worker.transform(file, dest));
}
return Promise.all(promises).finally(() => {
if (worker.end !== undefined) {
worker.end();
}
});
}
/**
* Resolve a nested dependency starting from the given file
*/
function resolveChain(baseUrl, ...packages) {
const require = createRequire(baseUrl);
return packages.reduce(
(base, pkg) =>
path.dirname(require.resolve(pkg + "/package.json", { paths: [base] })),
path.dirname(fileURLToPath(baseUrl))
);
}
// If this build is part of a pull request, include the pull request number in
// the version number.
let versionSuffix = "";
if (process.env.CIRCLE_PR_NUMBER) {
versionSuffix = "+pr." + process.env.CIRCLE_PR_NUMBER;
}
const babelVersion =
require("./packages/babel-core/package.json").version + versionSuffix;
function buildRollup(packages, targetBrowsers) {
const sourcemap = process.env.NODE_ENV === "production";
return Promise.all(
packages.map(
async ({ src, format, dest, name, filename, envName = "rollup" }) => {
const pkgJSON = require("./" + src + "/package.json");
const version = pkgJSON.version + versionSuffix;
const { dependencies = {}, peerDependencies = {} } = pkgJSON;
const external = Object.keys(dependencies).concat(
Object.keys(peerDependencies)
);
const input = getIndexFromPackage(src);
fancyLog(`Compiling '${chalk.cyan(input)}' with rollup ...`);
const bundle = await rollup({
input,
external,
onwarn(warning, warn) {
if (warning.code === "CIRCULAR_DEPENDENCY") return;
if (warning.code === "UNUSED_EXTERNAL_IMPORT") {
warn(warning);
return;
}
// Rollup warns about using babel.default at
// https://github.com/babel/babel-polyfills/blob/4ac92be5b70b13e3d8a34614d8ecd900eb3f40e4/packages/babel-helper-define-polyfill-provider/src/types.js#L5
// We can safely ignore this warning, and let Rollup replace it with undefined.
if (
warning.code === "MISSING_EXPORT" &&
warning.exporter === "packages/babel-core/src/index.ts" &&
warning.missing === "default" &&
[
"@babel/helper-define-polyfill-provider",
"babel-plugin-polyfill-corejs2",
"babel-plugin-polyfill-corejs3",
"babel-plugin-polyfill-regenerator",
].some(pkg => warning.importer.includes(pkg))
) {
return;
}
// We use console.warn here since it prints more info than just "warn",
// in case we want to stop throwing for a specific message.
console.warn(warning);
// https://github.com/babel/babel/pull/12011#discussion_r540434534
throw new Error("Rollup aborted due to warnings above");
},
plugins: [
rollupBabelSource(),
rollupReplace({
preventAssignment: true,
values: {
"process.env.NODE_ENV": JSON.stringify(process.env.NODE_ENV),
BABEL_VERSION: JSON.stringify(babelVersion),
VERSION: JSON.stringify(version),
},
}),
rollupCommonJs({
include: [
/node_modules/,
"packages/babel-runtime/regenerator/**",
"packages/babel-preset-env/data/*.js",
// Rollup doesn't read export maps, so it loads the cjs fallback
"packages/babel-compat-data/*.js",
"packages/*/src/**/*.cjs",
// See the comment in this file for the reason to include it
"packages/babel-standalone/src/dynamic-require-entrypoint.cjs",
],
dynamicRequireTargets: [
// https://github.com/mathiasbynens/regexpu-core/blob/ffd8fff2e31f4597f6fdfee75d5ac1c5c8111ec3/rewrite-pattern.js#L48
resolveChain(
import.meta.url,
"./packages/babel-helper-create-regexp-features-plugin",
"regexpu-core",
"regenerate-unicode-properties"
) + "/**/*.js",
],
// Never delegate to the native require()
ignoreDynamicRequires: true,
// Align with the Node.js behavior
defaultIsModuleExports: true,
}),
rollupBabel({
envName,
babelrc: false,
babelHelpers: "bundled",
extends: "./babel.config.js",
extensions: [".ts", ".js", ".mjs", ".cjs"],
}),
rollupNodeResolve({
extensions: [".ts", ".js", ".mjs", ".cjs", ".json"],
browser: targetBrowsers,
exportConditions: targetBrowsers ? ["browser"] : [],
// It needs to be set to 'false' when using rollupNodePolyfills
// https://github.com/rollup/plugins/issues/772
preferBuiltins: !targetBrowsers,
}),
rollupJson(),
targetBrowsers &&
rollupNodePolyfills({
sourceMap: sourcemap,
include: "**/*.{js,cjs,ts}",
}),
].filter(Boolean),
});
const outputFile = path.join(src, dest, filename || "index.js");
await bundle.write({
file: outputFile,
format,
name,
sourcemap: sourcemap,
exports: "named",
});
if (!process.env.IS_PUBLISH) {
fancyLog(
chalk.yellow(
`Skipped minification of '${chalk.cyan(
outputFile
)}' because not publishing`
)
);
return undefined;
}
fancyLog(`Minifying '${chalk.cyan(outputFile)}'...`);
await bundle.write({
file: outputFile.replace(/\.js$/, ".min.js"),
format,
name,
sourcemap: sourcemap,
exports: "named",
plugins: [
rollupTerser({
// workaround https://bugs.webkit.org/show_bug.cgi?id=212725
output: {
ascii_only: true,
},
numWorkers: process.env.CIRCLECI ? 1 : undefined,
}),
],
});
}
)
);
}
function buildRollupDts(packages) {
const sourcemap = process.env.NODE_ENV === "production";
return Promise.all(
packages.map(async packageName => {
const input = `${mapToDts(packageName)}/src/index.d.ts`;
const output = `${packageName}/lib/index.d.ts`;
fancyLog(`Bundling '${chalk.cyan(output)}' with rollup ...`);
const bundle = await rollup({
input,
plugins: [rollupDts()],
onwarn(warning, warn) {
if (warning.code !== "CIRCULAR_DEPENDENCY") warn(warning);
},
});
await bundle.write({
file: output,
format: "es",
sourcemap: sourcemap,
exports: "named",
});
})
);
}
function copyDts(packages) {
return getFiles(`${defaultPackagesGlob}/src/**/*.d.ts`, { include: packages })
.pipe(rename(file => path.resolve(file.base, mapToDts(file.relative))))
.pipe(gulp.dest(monorepoRoot));
}
const libBundles = [
"packages/babel-parser",
"packages/babel-plugin-proposal-object-rest-spread",
"packages/babel-plugin-proposal-optional-chaining",
"packages/babel-preset-react",
"packages/babel-preset-typescript",
"packages/babel-helper-member-expression-to-functions",
"packages/babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining",
"packages/babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression",
].map(src => ({
src,
format: "cjs",
dest: "lib",
}));
const dtsBundles = ["packages/babel-types"];
const standaloneBundle = [
{
src: "packages/babel-standalone",
format: "umd",
name: "Babel",
filename: "babel.js",
dest: "",
version: babelVersion,
envName: "standalone",
},
];
gulp.task("generate-type-helpers", () => {
fancyLog("Generating @babel/types and @babel/traverse dynamic functions");
return Promise.all([
generateTypeHelpers("asserts"),
generateTypeHelpers("builders"),
generateTypeHelpers("builders", "uppercase.js"),
generateTypeHelpers("constants"),
generateTypeHelpers("validators"),
generateTypeHelpers("ast-types"),
generateTraverseHelpers("asserts"),
generateTraverseHelpers("validators"),
generateTraverseHelpers("virtual-types"),
]);
});
gulp.task("generate-runtime-helpers", () => {
fancyLog("Generating @babel/helpers runtime helpers");
return generateRuntimeHelpers();
});
gulp.task("generate-standalone", () => generateStandalone());
gulp.task("build-rollup", () => buildRollup(libBundles));
gulp.task("rollup-babel-standalone", () => buildRollup(standaloneBundle, true));
gulp.task(
"build-babel-standalone",
gulp.series("generate-standalone", "rollup-babel-standalone")
);
gulp.task("copy-dts", () => copyDts(dtsBundles));
gulp.task(
"bundle-dts",
gulp.series("copy-dts", () => buildRollupDts(dtsBundles))
);
gulp.task("build-babel", () => buildBabel(true, /* exclude */ libBundles));
gulp.task("build-vendor", async () => {
const input = fileURLToPath(
await importMetaResolve("import-meta-resolve", import.meta.url)
);
const output = "./packages/babel-core/src/vendor/import-meta-resolve.js";
const bundle = await rollup({
input,
onwarn(warning, warn) {
if (warning.code === "CIRCULAR_DEPENDENCY") return;
warn(warning);
},
plugins: [
rollupCommonJs({ defaultIsModuleExports: true }),
rollupNodeResolve({
extensions: [".js", ".mjs", ".cjs", ".json"],
preferBuiltins: true,
}),
],
});
await bundle.write({
file: output,
format: "es",
sourcemap: false,
exports: "named",
banner: String.raw`
/****************************************************************************\
* NOTE FROM BABEL AUTHORS *
* This file is inlined from https://github.com/wooorm/import-meta-resolve, *
* because we need to compile it to CommonJS. *
\****************************************************************************/
/*
${fs.readFileSync(path.join(path.dirname(input), "license"), "utf8")}*/
`,
});
fs.writeFileSync(
output.replace(".js", ".d.ts"),
`export function resolve(specifier: stirng, parent: string): Promise<string>;`
);
});
gulp.task(
"build",
gulp.series(
"build-vendor",
gulp.parallel("build-rollup", "build-babel", "generate-runtime-helpers"),
gulp.parallel(
"generate-standalone",
gulp.series(
"generate-type-helpers",
// rebuild @babel/types since type-helpers may be changed
"build-babel"
)
)
)
);
gulp.task("default", gulp.series("build"));
// First build on worker processes for compilation speed
gulp.task("build-no-bundle", () => buildBabel(true));
// Incremental builds take place in main process
gulp.task("build-no-bundle-watch", () => buildBabel(false));
gulp.task(
"build-dev",
gulp.series(
"build-vendor",
"build-no-bundle",
gulp.parallel(
"generate-standalone",
gulp.series(
"generate-type-helpers",
// rebuild @babel/types since type-helpers may be changed
"build-no-bundle"
)
)
)
);
gulp.task(
"watch",
gulp.series("build-dev", function watch() {
gulp.watch(defaultSourcesGlob, gulp.task("build-no-bundle-watch"));
gulp.watch(
babelStandalonePluginConfigGlob,
gulp.task("generate-standalone")
);
gulp.watch(buildTypingsWatchGlob, gulp.task("generate-type-helpers"));
gulp.watch(
"./packages/babel-helpers/src/helpers/*.js",
gulp.task("generate-runtime-helpers")
);
})
);