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65 рядки
2.2 KiB
65 рядки
2.2 KiB
/**
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* Worker thread to minify JS & CSS files out of the main NodeJS thread
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*/
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const CleanCSS = require('clean-css');
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const Terser = require('terser');
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const path = require('path');
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const Threads = require('threads');
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function compressJS(content) {
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return Terser.minify(content);
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}
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function compressCSS(filename, ROOT_DIR) {
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return new Promise((res, rej) => {
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try {
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const absPath = path.join(ROOT_DIR, filename);
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/*
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* Changes done to migrate CleanCSS 3.x -> 4.x:
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*
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* 1. Rework the rebase logic, because the API was simplified (but we have
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* less control now). See:
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* https://github.com/jakubpawlowicz/clean-css/blob/08f3a74925524d30bbe7ac450979de0a8a9e54b2/README.md#important-40-breaking-changes
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*
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* EXAMPLE:
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* The URLs contained in a CSS file (including all the stylesheets
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* imported by it) residing on disk at:
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* /home/muxator/etherpad/src/static/css/pad.css
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*
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* Will be rewritten rebasing them to:
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* /home/muxator/etherpad/src/static/css
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*
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* 2. CleanCSS.minify() can either receive a string containing the CSS, or
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* an array of strings. In that case each array element is interpreted as
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* an absolute local path from which the CSS file is read.
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*
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* In version 4.x, CleanCSS API was simplified, eliminating the
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* relativeTo parameter, and thus we cannot use our already loaded
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* "content" argument, but we have to wrap the absolute path to the CSS
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* in an array and ask the library to read it by itself.
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*/
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const basePath = path.dirname(absPath);
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new CleanCSS({
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rebase: true,
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rebaseTo: basePath,
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}).minify([absPath], (errors, minified) => {
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if (errors) return rej(errors);
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return res(minified.styles);
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});
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} catch (error) {
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// on error, just yield the un-minified original, but write a log message
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console.error(`Unexpected error minifying ${filename} (${absPath}): ${error}`);
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callback(null, content);
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}
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});
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}
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Threads.expose({
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compressJS,
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compressCSS,
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});
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