269 lines
7.3 KiB
JavaScript
269 lines
7.3 KiB
JavaScript
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"use strict";
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const {
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minify: terserMinify
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} = require("terser");
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/** @typedef {import("source-map").RawSourceMap} RawSourceMap */
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/** @typedef {import("./index.js").ExtractCommentsOptions} ExtractCommentsOptions */
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/** @typedef {import("./index.js").CustomMinifyFunction} CustomMinifyFunction */
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/** @typedef {import("./index.js").MinifyOptions} MinifyOptions */
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/** @typedef {import("terser").MinifyOptions} TerserMinifyOptions */
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/** @typedef {import("terser").MinifyOutput} MinifyOutput */
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/** @typedef {import("terser").FormatOptions} FormatOptions */
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/** @typedef {import("terser").MangleOptions} MangleOptions */
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/** @typedef {import("./index.js").ExtractCommentsFunction} ExtractCommentsFunction */
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/** @typedef {import("./index.js").ExtractCommentsCondition} ExtractCommentsCondition */
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/**
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* @typedef {Object} InternalMinifyOptions
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* @property {string} name
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* @property {string} input
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* @property {RawSourceMap | undefined} inputSourceMap
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* @property {ExtractCommentsOptions} extractComments
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* @property {CustomMinifyFunction | undefined} minify
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* @property {MinifyOptions} minifyOptions
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*/
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/**
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* @typedef {Array<string>} ExtractedComments
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*/
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/**
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* @typedef {Promise<MinifyOutput & { extractedComments?: ExtractedComments}>} InternalMinifyResult
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*/
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/**
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* @typedef {TerserMinifyOptions & { sourceMap: undefined } & ({ output: FormatOptions & { beautify: boolean } } | { format: FormatOptions & { beautify: boolean } })} NormalizedTerserMinifyOptions
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*/
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/**
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* @param {TerserMinifyOptions} [terserOptions={}]
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* @returns {NormalizedTerserMinifyOptions}
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*/
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function buildTerserOptions(terserOptions = {}) {
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return { ...terserOptions,
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mangle: terserOptions.mangle == null ? true : typeof terserOptions.mangle === "boolean" ? terserOptions.mangle : { ...terserOptions.mangle
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},
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// Ignoring sourceMap from options
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// eslint-disable-next-line no-undefined
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sourceMap: undefined,
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// the `output` option is deprecated
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...(terserOptions.format ? {
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format: {
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beautify: false,
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...terserOptions.format
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}
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} : {
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output: {
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beautify: false,
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...terserOptions.output
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}
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})
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};
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}
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/**
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* @param {any} value
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* @returns {boolean}
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*/
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function isObject(value) {
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const type = typeof value;
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return value != null && (type === "object" || type === "function");
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}
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/**
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* @param {ExtractCommentsOptions} extractComments
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* @param {NormalizedTerserMinifyOptions} terserOptions
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* @param {ExtractedComments} extractedComments
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* @returns {ExtractCommentsFunction}
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*/
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function buildComments(extractComments, terserOptions, extractedComments) {
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/** @type {{ [index: string]: ExtractCommentsCondition }} */
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const condition = {};
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let comments;
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if (terserOptions.format) {
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({
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comments
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} = terserOptions.format);
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} else if (terserOptions.output) {
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({
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comments
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} = terserOptions.output);
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}
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condition.preserve = typeof comments !== "undefined" ? comments : false;
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if (typeof extractComments === "boolean" && extractComments) {
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condition.extract = "some";
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} else if (typeof extractComments === "string" || extractComments instanceof RegExp) {
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condition.extract = extractComments;
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} else if (typeof extractComments === "function") {
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condition.extract = extractComments;
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} else if (extractComments && isObject(extractComments)) {
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condition.extract = typeof extractComments.condition === "boolean" && extractComments.condition ? "some" : typeof extractComments.condition !== "undefined" ? extractComments.condition : "some";
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} else {
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// No extract
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// Preserve using "commentsOpts" or "some"
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condition.preserve = typeof comments !== "undefined" ? comments : "some";
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condition.extract = false;
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} // Ensure that both conditions are functions
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["preserve", "extract"].forEach(key => {
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/** @type {undefined | string} */
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let regexStr;
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/** @type {undefined | RegExp} */
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let regex;
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switch (typeof condition[key]) {
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case "boolean":
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condition[key] = condition[key] ? () => true : () => false;
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break;
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case "function":
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break;
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case "string":
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if (condition[key] === "all") {
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condition[key] = () => true;
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break;
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}
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if (condition[key] === "some") {
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condition[key] =
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/** @type {ExtractCommentsFunction} */
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(astNode, comment) => (comment.type === "comment2" || comment.type === "comment1") && /@preserve|@lic|@cc_on|^\**!/i.test(comment.value);
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break;
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}
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regexStr =
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/** @type {string} */
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condition[key];
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condition[key] =
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/** @type {ExtractCommentsFunction} */
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(astNode, comment) => new RegExp(
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/** @type {string} */
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regexStr).test(comment.value);
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break;
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default:
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regex =
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/** @type {RegExp} */
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condition[key];
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condition[key] =
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/** @type {ExtractCommentsFunction} */
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(astNode, comment) =>
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/** @type {RegExp} */
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regex.test(comment.value);
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}
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}); // Redefine the comments function to extract and preserve
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// comments according to the two conditions
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return (astNode, comment) => {
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if (
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/** @type {{ extract: ExtractCommentsFunction }} */
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condition.extract(astNode, comment)) {
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const commentText = comment.type === "comment2" ? `/*${comment.value}*/` : `//${comment.value}`; // Don't include duplicate comments
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if (!extractedComments.includes(commentText)) {
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extractedComments.push(commentText);
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}
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}
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return (
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/** @type {{ preserve: ExtractCommentsFunction }} */
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condition.preserve(astNode, comment)
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);
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};
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}
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/**
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* @param {InternalMinifyOptions} options
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* @returns {InternalMinifyResult}
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*/
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async function minify(options) {
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const {
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name,
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input,
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inputSourceMap,
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minify: minifyFn,
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minifyOptions
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} = options;
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if (minifyFn) {
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return minifyFn({
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[name]: input
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}, inputSourceMap, minifyOptions);
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} // Copy terser options
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const terserOptions = buildTerserOptions(minifyOptions); // Let terser generate a SourceMap
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if (inputSourceMap) {
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// @ts-ignore
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terserOptions.sourceMap = {
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asObject: true
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};
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}
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/** @type {ExtractedComments} */
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const extractedComments = [];
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const {
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extractComments
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} = options;
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if (terserOptions.output) {
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terserOptions.output.comments = buildComments(extractComments, terserOptions, extractedComments);
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} else if (terserOptions.format) {
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terserOptions.format.comments = buildComments(extractComments, terserOptions, extractedComments);
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}
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const result = await terserMinify({
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[name]: input
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}, terserOptions);
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return { ...result,
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extractedComments
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};
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}
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/**
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* @param {string} options
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* @returns {InternalMinifyResult}
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*/
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function transform(options) {
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// 'use strict' => this === undefined (Clean Scope)
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// Safer for possible security issues, albeit not critical at all here
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// eslint-disable-next-line no-param-reassign
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const evaluatedOptions =
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/** @type {InternalMinifyOptions} */
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// eslint-disable-next-line no-new-func
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new Function("exports", "require", "module", "__filename", "__dirname", `'use strict'\nreturn ${options}`)(exports, require, module, __filename, __dirname);
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return minify(evaluatedOptions);
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}
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module.exports.minify = minify;
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module.exports.transform = transform;
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