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"use strict";
/** @typedef {import("./index.js").Input} Input */
/** @typedef {import("source-map").RawSourceMap} RawSourceMap */
/** @typedef {import("source-map").SourceMapGenerator} SourceMapGenerator */
/** @typedef {import("./index.js").MinimizedResult} MinimizedResult */
/** @typedef {import("./index.js").CustomOptions} CustomOptions */
/** @typedef {import("postcss").ProcessOptions} ProcessOptions */
/** @typedef {import("postcss").Postcss} Postcss */
const notSettled = Symbol(`not-settled`);
/**
* @template T
* @typedef {() => Promise<T>} Task
*/
/**
* Run tasks with limited concurency.
* @template T
* @param {number} limit - Limit of tasks that run at once.
* @param {Task<T>[]} tasks - List of tasks to run.
* @returns {Promise<T[]>} A promise that fulfills to an array of the results
*/
function throttleAll(limit, tasks) {
if (!Number.isInteger(limit) || limit < 1) {
throw new TypeError(`Expected \`limit\` to be a finite number > 0, got \`${limit}\` (${typeof limit})`);
}
if (!Array.isArray(tasks) || !tasks.every(task => typeof task === `function`)) {
throw new TypeError(`Expected \`tasks\` to be a list of functions returning a promise`);
}
return new Promise((resolve, reject) => {
const result = Array(tasks.length).fill(notSettled);
const entries = tasks.entries();
const next = () => {
const {
done,
value
} = entries.next();
if (done) {
const isLast = !result.includes(notSettled);
if (isLast) resolve(result);
return;
}
const [index, task] = value;
/**
* @param {T} x
*/
const onFulfilled = x => {
result[index] = x;
next();
};
task().then(onFulfilled, reject);
};
Array(limit).fill(0).forEach(next);
});
}
/* istanbul ignore next */
/**
* @param {Input} input
* @param {RawSourceMap | undefined} sourceMap
* @param {CustomOptions} minimizerOptions
* @return {Promise<MinimizedResult>}
*/
async function cssnanoMinify(input, sourceMap, minimizerOptions = {
preset: "default"
}) {
/**
* @template T
* @param {string} module
* @returns {Promise<T>}
*/
const load = async module => {
let exports;
try {
// eslint-disable-next-line import/no-dynamic-require, global-require
exports = require(module);
return exports;
} catch (requireError) {
let importESM;
try {
// eslint-disable-next-line no-new-func
importESM = new Function("id", "return import(id);");
} catch (e) {
importESM = null;
}
if (
/** @type {Error & {code: string}} */
requireError.code === "ERR_REQUIRE_ESM" && importESM) {
exports = await importESM(module);
return exports.default;
}
throw requireError;
}
};
const [[name, code]] = Object.entries(input);
/** @type {ProcessOptions} */
const postcssOptions = {
from: name,
...minimizerOptions.processorOptions
};
if (typeof postcssOptions.parser === "string") {
try {
postcssOptions.parser = await load(postcssOptions.parser);
} catch (error) {
throw new Error(`Loading PostCSS "${postcssOptions.parser}" parser failed: ${
/** @type {Error} */
error.message}\n\n(@${name})`);
}
}
if (typeof postcssOptions.stringifier === "string") {
try {
postcssOptions.stringifier = await load(postcssOptions.stringifier);
} catch (error) {
throw new Error(`Loading PostCSS "${postcssOptions.stringifier}" stringifier failed: ${
/** @type {Error} */
error.message}\n\n(@${name})`);
}
}
if (typeof postcssOptions.syntax === "string") {
try {
postcssOptions.syntax = await load(postcssOptions.syntax);
} catch (error) {
throw new Error(`Loading PostCSS "${postcssOptions.syntax}" syntax failed: ${
/** @type {Error} */
error.message}\n\n(@${name})`);
}
}
if (sourceMap) {
postcssOptions.map = {
annotation: false
};
}
/** @type {Postcss} */
// eslint-disable-next-line global-require
const postcss = require("postcss").default; // @ts-ignore
// eslint-disable-next-line global-require
const cssnano = require("cssnano"); // @ts-ignore
// Types are broken
const result = await postcss([cssnano(minimizerOptions)]).process(code, postcssOptions);
return {
code: result.css,
map: result.map ? result.map.toJSON() : // eslint-disable-next-line no-undefined
undefined,
warnings: result.warnings().map(String)
};
}
/* istanbul ignore next */
/**
* @param {Input} input
* @param {RawSourceMap | undefined} sourceMap
* @param {CustomOptions} minimizerOptions
* @return {Promise<MinimizedResult>}
*/
async function cssoMinify(input, sourceMap, minimizerOptions) {
// eslint-disable-next-line global-require,import/no-extraneous-dependencies
const csso = require("csso");
const [[filename, code]] = Object.entries(input);
const result = csso.minify(code, {
filename,
sourceMap: Boolean(sourceMap),
...minimizerOptions
});
return {
code: result.css,
map: result.map ?
/** @type {SourceMapGenerator & { toJSON(): RawSourceMap }} */
result.map.toJSON() : // eslint-disable-next-line no-undefined
undefined
};
}
/* istanbul ignore next */
/**
* @param {Input} input
* @param {RawSourceMap | undefined} sourceMap
* @param {CustomOptions} minimizerOptions
* @return {Promise<MinimizedResult>}
*/
async function cleanCssMinify(input, sourceMap, minimizerOptions) {
// eslint-disable-next-line global-require,import/no-extraneous-dependencies
const CleanCSS = require("clean-css");
const [[name, code]] = Object.entries(input);
const result = await new CleanCSS({
sourceMap: Boolean(sourceMap),
...minimizerOptions,
returnPromise: true
}).minify({
[name]: {
styles: code
}
});
const generatedSourceMap = result.sourceMap &&
/** @type {SourceMapGenerator & { toJSON(): RawSourceMap }} */
result.sourceMap.toJSON(); // workaround for source maps on windows
if (generatedSourceMap) {
// eslint-disable-next-line global-require
const isWindowsPathSep = require("path").sep === "\\";
generatedSourceMap.sources = generatedSourceMap.sources.map(
/**
* @param {string} item
* @returns {string}
*/
item => isWindowsPathSep ? item.replace(/\\/g, "/") : item);
}
return {
code: result.styles,
map: generatedSourceMap,
warnings: result.warnings
};
}
/* istanbul ignore next */
/**
* @param {Input} input
* @param {RawSourceMap | undefined} sourceMap
* @param {CustomOptions} minimizerOptions
* @return {Promise<MinimizedResult>}
*/
async function esbuildMinify(input, sourceMap, minimizerOptions) {
/**
* @param {import("esbuild").TransformOptions} [esbuildOptions={}]
* @returns {import("esbuild").TransformOptions}
*/
const buildEsbuildOptions = (esbuildOptions = {}) => {
// Need deep copy objects to avoid https://github.com/terser/terser/issues/366
return {
loader: "css",
minify: true,
legalComments: "inline",
...esbuildOptions,
sourcemap: false
};
}; // eslint-disable-next-line import/no-extraneous-dependencies, global-require
const esbuild = require("esbuild"); // Copy `esbuild` options
const esbuildOptions = buildEsbuildOptions(minimizerOptions); // Let `esbuild` generate a SourceMap
if (sourceMap) {
esbuildOptions.sourcemap = true;
esbuildOptions.sourcesContent = false;
}
const [[filename, code]] = Object.entries(input);
esbuildOptions.sourcefile = filename;
const result = await esbuild.transform(code, esbuildOptions);
return {
code: result.code,
// eslint-disable-next-line no-undefined
map: result.map ? JSON.parse(result.map) : undefined,
warnings: result.warnings.length > 0 ? result.warnings.map(item => {
return {
source: item.location && item.location.file,
// eslint-disable-next-line no-undefined
line: item.location && item.location.line ? item.location.line : undefined,
// eslint-disable-next-line no-undefined
column: item.location && item.location.column ? item.location.column : undefined,
plugin: item.pluginName,
message: `${item.text}${item.detail ? `\nDetails:\n${item.detail}` : ""}${item.notes.length > 0 ? `\n\nNotes:\n${item.notes.map(note => `${note.location ? `[${note.location.file}:${note.location.line}:${note.location.column}] ` : ""}${note.text}${note.location ? `\nSuggestion: ${note.location.suggestion}` : ""}${note.location ? `\nLine text:\n${note.location.lineText}\n` : ""}`).join("\n")}` : ""}`
};
}) : []
};
}
/* istanbul ignore next */
/**
* @param {Input} input
* @param {RawSourceMap | undefined} sourceMap
* @param {CustomOptions} minimizerOptions
* @return {Promise<MinimizedResult>}
*/
async function parcelCssMinify(input, sourceMap, minimizerOptions) {
const [[filename, code]] = Object.entries(input);
/**
* @param {Partial<import("@parcel/css").TransformOptions>} [parcelCssOptions={}]
* @returns {import("@parcel/css").TransformOptions}
*/
const buildParcelCssOptions = (parcelCssOptions = {}) => {
// Need deep copy objects to avoid https://github.com/terser/terser/issues/366
return {
minify: true,
...parcelCssOptions,
sourceMap: false,
filename,
code: Buffer.from(code)
};
}; // eslint-disable-next-line import/no-extraneous-dependencies, global-require
const parcelCss = require("@parcel/css"); // Copy `esbuild` options
const parcelCssOptions = buildParcelCssOptions(minimizerOptions); // Let `esbuild` generate a SourceMap
if (sourceMap) {
parcelCssOptions.sourceMap = true;
}
const result = await parcelCss.transform(parcelCssOptions);
return {
code: result.code.toString(),
// eslint-disable-next-line no-undefined
map: result.map ? JSON.parse(result.map.toString()) : undefined
};
}
module.exports = {
throttleAll,
cssnanoMinify,
cssoMinify,
cleanCssMinify,
esbuildMinify,
parcelCssMinify
};