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import fs from 'fs';
import { resolve, relative, dirname, basename, extname } from 'path';
import { green, red, yellow, white, blue } from 'kleur';
import { map, series } from 'asyncro';
import glob from 'tiny-glob/sync';
import autoprefixer from 'autoprefixer';
import cssnano from 'cssnano';
import { rollup, watch } from 'rollup';
import commonjs from '@rollup/plugin-commonjs';
import babel from 'rollup-plugin-babel';
import customBabel from './lib/babel-custom';
import nodeResolve from '@rollup/plugin-node-resolve';
import { terser } from 'rollup-plugin-terser';
import alias from '@rollup/plugin-alias';
import postcss from 'rollup-plugin-postcss';
import gzipSize from 'gzip-size';
import brotliSize from 'brotli-size';
import prettyBytes from 'pretty-bytes';
import typescript from 'rollup-plugin-typescript2';
import json from '@rollup/plugin-json';
import logError from './log-error';
import { readFile, isDir, isFile, stdout, stderr, isTruthy } from './utils';
import camelCase from 'camelcase';
const removeScope = name => name.replace(/^@.*\//, '');
// Convert booleans and int define= values to literals.
// This is more intuitive than `microbundle --define A=1` producing A="1".
const toReplacementExpression = (value, name) => {
// --define A="1",B='true' produces string:
const matches = value.match(/^(['"])(.+)\1$/);
if (matches) {
return [JSON.stringify(matches[2]), name];
}
// --define A=1,B=true produces int/boolean literal:
if (/^(true|false|\d+)$/i.test(value)) {
return [value, name];
}
// default: string literal
return [JSON.stringify(value), name];
};
// Normalize Terser options from microbundle's relaxed JSON format (mutates argument in-place)
function normalizeMinifyOptions(minifyOptions) {
const mangle = minifyOptions.mangle || (minifyOptions.mangle = {});
let properties = mangle.properties;
// allow top-level "properties" key to override mangle.properties (including {properties:false}):
if (minifyOptions.properties != null) {
properties = mangle.properties =
minifyOptions.properties &&
Object.assign(properties, minifyOptions.properties);
}
// allow previous format ({ mangle:{regex:'^_',reserved:[]} }):
if (minifyOptions.regex || minifyOptions.reserved) {
if (!properties) properties = mangle.properties = {};
properties.regex = properties.regex || minifyOptions.regex;
properties.reserved = properties.reserved || minifyOptions.reserved;
}
if (properties) {
if (properties.regex) properties.regex = new RegExp(properties.regex);
properties.reserved = [].concat(properties.reserved || []);
}
}
// Parses values of the form "$=jQuery,React=react" into key-value object pairs.
const parseMappingArgument = (globalStrings, processValue) => {
const globals = {};
globalStrings.split(',').forEach(globalString => {
let [key, value] = globalString.split('=');
if (processValue) {
const r = processValue(value, key);
if (r !== undefined) {
if (Array.isArray(r)) {
[value, key] = r;
} else {
value = r;
}
}
}
globals[key] = value;
});
return globals;
};
// Parses values of the form "$=jQuery,React=react" into key-value object pairs.
const parseMappingArgumentAlias = aliasStrings => {
return aliasStrings.split(',').map(str => {
let [key, value] = str.split('=');
return { find: key, replacement: value };
});
};
// Extensions to use when resolving modules
const EXTENSIONS = ['.ts', '.tsx', '.js', '.jsx', '.es6', '.es', '.mjs'];
const WATCH_OPTS = {
exclude: 'node_modules/**',
};
// Hoist function because something (rollup?) incorrectly removes it
function formatSize(size, filename, type, raw) {
const pretty = raw ? `${size} B` : prettyBytes(size);
const color = size < 5000 ? green : size > 40000 ? red : yellow;
const MAGIC_INDENTATION = type === 'br' ? 13 : 10;
return `${' '.repeat(MAGIC_INDENTATION - pretty.length)}${color(
pretty,
)}: ${white(basename(filename))}.${type}`;
}
async function getSizeInfo(code, filename, raw) {
const gzip = formatSize(
await gzipSize(code),
filename,
'gz',
raw || code.length < 5000,
);
let brotli;
//wrap brotliSize in try/catch in case brotli is unavailable due to
//lower node version
try {
brotli = formatSize(
await brotliSize(code),
filename,
'br',
raw || code.length < 5000,
);
} catch (e) {
return gzip;
}
return gzip + '\n' + brotli;
}
export default async function microbundle(inputOptions) {
let options = { ...inputOptions };
options.cwd = resolve(process.cwd(), inputOptions.cwd);
const cwd = options.cwd;
const { hasPackageJson, pkg } = await getConfigFromPkgJson(cwd);
options.pkg = pkg;
const { finalName, pkgName } = getName({
name: options.name,
pkgName: options.pkg.name,
amdName: options.pkg.amdName,
hasPackageJson,
cwd,
});
options.name = finalName;
options.pkg.name = pkgName;
if (options.sourcemap !== false) {
options.sourcemap = true;
}
options.input = await getInput({
entries: options.entries,
cwd,
source: options.pkg.source,
module: options.pkg.module,
});
options.output = await getOutput({
cwd,
output: options.output,
pkgMain: options.pkg.main,
pkgName: options.pkg.name,
});
options.entries = await getEntries({
cwd,
input: options.input,
});
options.multipleEntries = options.entries.length > 1;
// to disable compress you can put in false or 0 but it's a string so our boolean checks won't work
options.compress =
typeof options.compress !== 'boolean'
? options.compress !== 'false' && options.compress !== '0'
: options.compress;
let formats = (options.format || options.formats).split(',');
// always compile cjs first if it's there:
formats.sort((a, b) => (a === 'cjs' ? -1 : a > b ? 1 : 0));
let steps = [];
for (let i = 0; i < options.entries.length; i++) {
for (let j = 0; j < formats.length; j++) {
steps.push(
createConfig(
options,
options.entries[i],
formats[j],
i === 0 && j === 0,
),
);
}
}
if (options.watch) {
const onBuild = options.onBuild;
return new Promise((resolve, reject) => {
stdout(
blue(
`Watching source, compiling to ${relative(
cwd,
dirname(options.output),
)}:`,
),
);
steps.map(options => {
watch(
Object.assign(
{
output: options.outputOptions,
watch: WATCH_OPTS,
},
options.inputOptions,
),
).on('event', e => {
if (e.code === 'FATAL') {
return reject(e.error);
} else if (e.code === 'ERROR') {
logError(e.error);
}
if (e.code === 'END') {
options._sizeInfo.then(text => {
stdout(`Wrote ${text.trim()}`);
});
if (typeof onBuild === 'function') {
onBuild(e);
}
}
});
});
});
}
let cache;
let out = await series(
steps.map(config => async () => {
const { inputOptions, outputOptions } = config;
inputOptions.cache = cache;
let bundle = await rollup(inputOptions);
cache = bundle;
await bundle.write(outputOptions);
return await config._sizeInfo;
}),
);
return (
blue(
`Build "${options.name}" to ${relative(cwd, dirname(options.output)) ||
'.'}:`,
) +
'\n ' +
out.join('\n ')
);
}
async function getConfigFromPkgJson(cwd) {
try {
const pkgJSON = await readFile(resolve(cwd, 'package.json'), 'utf8');
const pkg = JSON.parse(pkgJSON);
return {
hasPackageJson: true,
pkg,
};
} catch (err) {
const pkgName = basename(cwd);
stderr(
// `Warn ${yellow(`no package.json found. Assuming a pkg.name of "${pkgName}".`)}`
yellow(
`${yellow().inverse(
'WARN',
)} no package.json found. Assuming a pkg.name of "${pkgName}".`,
),
);
let msg = String(err.message || err);
if (!msg.match(/ENOENT/)) stderr(` ${red().dim(msg)}`);
return { hasPackageJson: false, pkg: { name: pkgName } };
}
}
const safeVariableName = name =>
camelCase(
removeScope(name)
.toLowerCase()
.replace(/((^[^a-zA-Z]+)|[^\w.-])|([^a-zA-Z0-9]+$)/g, ''),
);
function getName({ name, pkgName, amdName, cwd, hasPackageJson }) {
if (!pkgName) {
pkgName = basename(cwd);
if (hasPackageJson) {
stderr(
yellow(
`${yellow().inverse(
'WARN',
)} missing package.json "name" field. Assuming "${pkgName}".`,
),
);
}
}
return { finalName: name || amdName || safeVariableName(pkgName), pkgName };
}
async function jsOrTs(cwd, filename) {
const extension = (await isFile(resolve(cwd, filename + '.ts')))
? '.ts'
: (await isFile(resolve(cwd, filename + '.tsx')))
? '.tsx'
: '.js';
return resolve(cwd, `${filename}${extension}`);
}
async function getInput({ entries, cwd, source, module }) {
const input = [];
[]
.concat(
entries && entries.length
? entries
: (source &&
(Array.isArray(source) ? source : [source]).map(file =>
resolve(cwd, file),
)) ||
((await isDir(resolve(cwd, 'src'))) &&
(await jsOrTs(cwd, 'src/index'))) ||
(await jsOrTs(cwd, 'index')) ||
module,
)
.map(file => glob(file))
.forEach(file => input.push(...file));
return input;
}
async function getOutput({ cwd, output, pkgMain, pkgName }) {
let main = resolve(cwd, output || pkgMain || 'dist');
if (!main.match(/\.[a-z]+$/) || (await isDir(main))) {
main = resolve(main, `${removeScope(pkgName)}.js`);
}
return main;
}
async function getEntries({ input, cwd }) {
let entries = (
await map([].concat(input), async file => {
file = resolve(cwd, file);
if (await isDir(file)) {
file = resolve(file, 'index.js');
}
return file;
})
).filter((item, i, arr) => arr.indexOf(item) === i);
return entries;
}
// shebang cache map because the transform only gets run once
const shebang = {};
function createConfig(options, entry, format, writeMeta) {
let { pkg } = options;
let external = ['dns', 'fs', 'path', 'url'].concat(
options.entries.filter(e => e !== entry),
);
let outputAliases = {};
// since we transform src/index.js, we need to rename imports for it:
if (options.multipleEntries) {
outputAliases['.'] = './' + basename(options.output);
}
const moduleAliases = options.alias
? parseMappingArgumentAlias(options.alias)
: [];
const peerDeps = Object.keys(pkg.peerDependencies || {});
if (options.external === 'none') {
// bundle everything (external=[])
} else if (options.external) {
external = external.concat(peerDeps).concat(options.external.split(','));
} else {
external = external
.concat(peerDeps)
.concat(Object.keys(pkg.dependencies || {}));
}
let globals = external.reduce((globals, name) => {
// valid JS identifiers are usually library globals:
if (name.match(/^[a-z_$][a-z0-9_$]*$/)) {
globals[name] = name;
}
return globals;
}, {});
if (options.globals && options.globals !== 'none') {
globals = Object.assign(globals, parseMappingArgument(options.globals));
}
let defines = {};
if (options.define) {
defines = Object.assign(
defines,
parseMappingArgument(options.define, toReplacementExpression),
);
}
function replaceName(filename, name) {
return resolve(
dirname(filename),
name + basename(filename).replace(/^[^.]+/, ''),
);
}
let mainNoExtension = options.output;
if (options.multipleEntries) {
let name = entry.match(/([\\/])index(\.(umd|cjs|es|m))?\.m?js$/)
? mainNoExtension
: entry;
mainNoExtension = resolve(dirname(mainNoExtension), basename(name));
}
mainNoExtension = mainNoExtension.replace(/(\.(umd|cjs|es|m))?\.m?js$/, '');
let moduleMain = replaceName(
pkg.module && !pkg.module.match(/src\//)
? pkg.module
: pkg['jsnext:main'] || 'x.esm.js',
mainNoExtension,
);
let modernMain = replaceName(
(pkg.syntax && pkg.syntax.esmodules) || pkg.esmodule || 'x.modern.js',
mainNoExtension,
);
let cjsMain = replaceName(pkg['cjs:main'] || 'x.js', mainNoExtension);
let umdMain = replaceName(pkg['umd:main'] || 'x.umd.js', mainNoExtension);
const modern = format === 'modern';
// let rollupName = safeVariableName(basename(entry).replace(/\.js$/, ''));
let nameCache = {};
const bareNameCache = nameCache;
// Support "minify" field and legacy "mangle" field via package.json:
const rawMinifyValue = options.pkg.minify || options.pkg.mangle || {};
let minifyOptions = typeof rawMinifyValue === 'string' ? {} : rawMinifyValue;
const getNameCachePath =
typeof rawMinifyValue === 'string'
? () => resolve(options.cwd, rawMinifyValue)
: () => resolve(options.cwd, 'mangle.json');
const useTypescript = extname(entry) === '.ts' || extname(entry) === '.tsx';
const externalPredicate = new RegExp(`^(${external.join('|')})($|/)`);
const externalTest =
external.length === 0 ? id => false : id => externalPredicate.test(id);
function loadNameCache() {
try {
nameCache = JSON.parse(fs.readFileSync(getNameCachePath(), 'utf8'));
// mangle.json can contain a "minify" field, same format as the pkg.mangle:
if (nameCache.minify) {
minifyOptions = Object.assign(
{},
minifyOptions || {},
nameCache.minify,
);
}
} catch (e) {}
}
loadNameCache();
normalizeMinifyOptions(minifyOptions);
if (nameCache === bareNameCache) nameCache = null;
let config = {
inputOptions: {
input: entry,
external: id => {
if (id === 'babel-plugin-transform-async-to-promises/helpers') {
return false;
}
if (options.multipleEntries && id === '.') {
return true;
}
return externalTest(id);
},
treeshake: {
propertyReadSideEffects: false,
},
plugins: []
.concat(
postcss({
plugins: [
autoprefixer(),
options.compress !== false &&
cssnano({
preset: 'default',
}),
].filter(Boolean),
autoModules: shouldCssModules(options),
modules: cssModulesConfig(options),
// only write out CSS for the first bundle (avoids pointless extra files):
inject: false,
extract: !!writeMeta,
}),
moduleAliases.length > 0 &&
alias({
resolve: EXTENSIONS,
entries: moduleAliases,
}),
nodeResolve({
mainFields: ['module', 'jsnext', 'main'],
browser: options.target !== 'node',
// defaults + .jsx
extensions: ['.mjs', '.js', '.jsx', '.json', '.node'],
}),
commonjs({
// use a regex to make sure to include eventual hoisted packages
include: /\/node_modules\//,
}),
json(),
{
// We have to remove shebang so it doesn't end up in the middle of the code somewhere
transform: code => ({
code: code.replace(/^#![^\n]*/, bang => {
shebang[options.name] = bang;
}),
map: null,
}),
},
useTypescript &&
typescript({
typescript: require('typescript'),
cacheRoot: `./node_modules/.cache/.rts2_cache_${format}`,
tsconfigDefaults: {
compilerOptions: {
sourceMap: options.sourcemap,
declaration: true,
jsx: 'react',
jsxFactory: options.jsx || 'h',
},
},
tsconfig: options.tsconfig,
tsconfigOverride: {
compilerOptions: {
target: 'esnext',
},
},
}),
// if defines is not set, we shouldn't run babel through node_modules
isTruthy(defines) &&
babel({
babelrc: false,
configFile: false,
compact: false,
include: 'node_modules/**',
plugins: [
[
require.resolve('babel-plugin-transform-replace-expressions'),
{ replace: defines },
],
],
}),
customBabel()({
extensions: EXTENSIONS,
exclude: 'node_modules/**',
passPerPreset: true, // @see https://babeljs.io/docs/en/options#passperpreset
custom: {
defines,
modern,
compress: options.compress !== false,
targets: options.target === 'node' ? { node: '8' } : undefined,
pragma: options.jsx || 'h',
pragmaFrag: options.jsxFragment || 'Fragment',
typescript: !!useTypescript,
},
}),
options.compress !== false && [
terser({
sourcemap: true,
compress: Object.assign(
{
keep_infinity: true,
pure_getters: true,
// Ideally we'd just get Terser to respect existing Arrow functions...
// unsafe_arrows: true,
passes: 10,
},
minifyOptions.compress || {},
),
output: {
// By default, Terser wraps function arguments in extra parens to trigger eager parsing.
// Whether this is a good idea is way too specific to guess, so we optimize for size by default:
wrap_func_args: false,
},
warnings: true,
ecma: modern ? 9 : 5,
toplevel: modern || format === 'cjs' || format === 'es',
mangle: Object.assign({}, minifyOptions.mangle || {}),
nameCache,
}),
nameCache && {
// before hook
options: loadNameCache,
// after hook
writeBundle() {
if (writeMeta && nameCache) {
fs.writeFile(
getNameCachePath(),
JSON.stringify(nameCache, null, 2),
() => {},
);
}
},
},
],
{
writeBundle(bundle) {
config._sizeInfo = Promise.all(
Object.values(bundle).map(({ code, fileName }) => {
if (code) {
return getSizeInfo(code, fileName, options.raw);
}
}),
).then(results => results.filter(Boolean).join('\n'));
},
},
)
.filter(Boolean),
},
outputOptions: {
paths: outputAliases,
globals,
strict: options.strict === true,
legacy: true,
freeze: false,
esModule: false,
sourcemap: options.sourcemap,
get banner() {
return shebang[options.name];
},
format: modern ? 'es' : format,
name: options.name,
file: resolve(
options.cwd,
{
modern: modernMain,
es: moduleMain,
umd: umdMain,
}[format] || cjsMain,
),
},
};
return config;
}
function shouldCssModules(options) {
const passedInOption = processCssmodulesArgument(options);
// We should module when my-file.module.css or my-file.css
const moduleAllCss = passedInOption === true;
// We should module when my-file.module.css
const allowOnlySuffixModule = passedInOption === null;
return moduleAllCss || allowOnlySuffixModule;
}
function cssModulesConfig(options) {
const passedInOption = processCssmodulesArgument(options);
const isWatchMode = options.watch;
const hasPassedInScopeName = !(
typeof passedInOption === 'boolean' || passedInOption === null
);
if (shouldCssModules(options) || hasPassedInScopeName) {
let generateScopedName = isWatchMode
? '_[name]__[local]__[hash:base64:5]'
: '_[hash:base64:5]';
if (hasPassedInScopeName) {
generateScopedName = passedInOption; // would be the string from --css-modules "_[hash]".
}
return { generateScopedName };
}
return false;
}
/*
This is done becuase if you use the cli default property, you get a primiatve "null" or "false",
but when using the cli arguments, you always get back strings. This method aims at correcting those
for both realms. So that both realms _convert_ into primatives.
*/
function processCssmodulesArgument(options) {
if (options['css-modules'] === 'true' || options['css-modules'] === true)
return true;
if (options['css-modules'] === 'false' || options['css-modules'] === false)
return false;
if (options['css-modules'] === 'null' || options['css-modules'] === null)
return null;
return options['css-modules'];
}
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