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build.ts
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build.ts
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/* eslint-disable no-bitwise, no-console */
import type { BuildArtifact, BunPlugin } from 'bun';
import * as csso from 'csso';
import * as xcss from 'ekscss';
import * as lightningcss from 'lightningcss';
import { PurgeCSS } from 'purgecss';
import * as terser from 'terser';
import { createManifest } from './manifest.config';
import xcssConfig from './xcss.config';
const mode = Bun.env.NODE_ENV;
const dev = mode === 'development';
let css = '';
// XXX: Temporary workaround to build CSS until Bun.build supports css loader
const extractCSS: BunPlugin = {
name: 'extract-css',
setup(build) {
build.onLoad({ filter: /\.css$/ }, async (args) => {
css += await Bun.file(args.path).text();
return { contents: '', loader: 'js' };
});
build.onLoad({ filter: /\.xcss$/ }, async (args) => {
const source = await Bun.file(args.path).text();
const compiled = xcss.compile(source, {
from: args.path,
globals: xcssConfig.globals,
plugins: xcssConfig.plugins,
});
for (const warning of compiled.warnings) {
console.error('XCSS:', warning.message);
if (warning.file) {
console.log(
` at ${[warning.file, warning.line, warning.column]
.filter(Boolean)
.join(':')}`,
);
}
}
css += compiled.css;
return { contents: '', loader: 'js' };
});
},
};
function makeHTML() {
return `
<!doctype html>
<meta charset=utf-8>
<meta name=google value=notranslate>
<link href=literata.woff2 rel=preload as=font type=font/woff2 crossorigin>
<link href=reader.css rel=stylesheet>
<script src=health.js defer></script>
<script src=reader.js defer></script>
`
.trim()
.replaceAll(/\n\s+/g, '\n'); // remove leading whitespace
}
async function minifyCSS(artifact: BuildArtifact) {
const js = await artifact.text();
const purged = await new PurgeCSS().purge({
content: [{ extension: '.js', raw: js }],
css: [{ raw: css }],
safelist: ['html', 'body'],
blocklist: [
// XXX: Remember to remove if actually using the element tag
'article',
'aside',
'blockquote',
'break',
'canvas',
'dd',
// 'disabled',
'dt',
'embed',
'figcaption',
'figure',
// 'footer',
'h1',
'h2',
'h3',
'h4',
'h5',
'h6',
'header',
'hgroup',
'hr',
'iframe',
'img',
'input',
'link',
'main',
'nav',
'ol',
'pre',
'section',
'select',
'source',
'svg',
'table',
'textarea',
'ul',
],
});
// TODO: Migrate to bun CSS handling (which is based on lightningcss).
const minified = lightningcss.transform({
filename: 'popup.css',
code: new TextEncoder().encode(purged[0].css),
minify: true,
targets: { chrome: 123 << 16 }, // matches manifest minimum_chrome_version
});
for (const warning of minified.warnings) {
console.error('CSS:', warning.message);
}
const minified2 = csso.minify(minified.code.toString(), {
filename: 'popup.css',
// forceMediaMerge: true, // somewhat unsafe
usage: {
blacklist: {
classes: [
'button', // #apply mapped to 'button'
'disabled', // not actually used (as class)
],
},
},
// debug: true,
});
await Bun.write('dist/reader.css', minified2.css);
}
async function minifyJS(artifact: BuildArtifact) {
let source = await artifact.text();
// Improve collapsing variables; terser doesn't do this so we do it manually.
source = source.replaceAll('const ', 'let ');
const result = await terser.minify(source, {
ecma: 2020,
module: true,
compress: {
reduce_funcs: false, // prevent functions being inlined
hoist_funs: true,
// XXX: Comment out to keep performance markers for debugging.
pure_funcs: ['performance.mark', 'performance.measure'],
passes: 3,
},
mangle: {
properties: {
regex: /^\$\$/,
},
},
});
await Bun.write(artifact.path, result.code!);
}
console.time('prebuild');
await Bun.$`rm -rf dist`;
await Bun.$`cp -r static dist`;
console.timeEnd('prebuild');
// Extension manifest
console.time('manifest');
const manifest = createManifest();
const release = manifest.version_name ?? manifest.version;
await Bun.write('dist/manifest.json', JSON.stringify(manifest));
console.timeEnd('manifest');
// Reader app HTML
console.time('html');
await Bun.write('dist/reader.html', makeHTML());
console.timeEnd('html');
// Reader app JS
console.time('build');
const out = await Bun.build({
entrypoints: ['src/reader.ts'],
outdir: 'dist',
target: 'browser',
define: {
'process.env.APP_RELEASE': JSON.stringify(release),
'process.env.NODE_ENV': JSON.stringify(mode),
},
loader: {
'.svg': 'text',
},
external: ['literata-ext.woff2', 'literata-italic.woff2', 'literata.woff2'],
plugins: [extractCSS],
// minify: !dev,
minify: {
whitespace: !dev,
identifiers: !dev,
// FIXME: Bun macros break if syntax minify is disabled (due to string
// interpolation and concatenation not being resolved).
syntax: true,
},
sourcemap: dev ? 'linked' : 'none',
});
console.timeEnd('build');
console.log(out);
// Health insights (exception monitoring)
console.time('build2');
const out2 = await Bun.build({
entrypoints: ['src/health.ts'],
outdir: 'dist',
target: 'browser',
// FIXME: Consider using iife once bun supports it.
// format: 'iife', // monitoring code must not mutate global state
define: {
'process.env.APP_RELEASE': JSON.stringify(release),
'process.env.NODE_ENV': JSON.stringify(mode),
},
minify: !dev,
sourcemap: dev ? 'linked' : 'none',
});
console.timeEnd('build2');
console.log(out2);
if (dev) {
await Bun.write('dist/reader.css', css);
} else {
console.time('minify:css');
await minifyCSS(out.outputs[0]);
console.timeEnd('minify:css');
console.time('minify:js');
await minifyJS(out.outputs[0]);
await minifyJS(out2.outputs[0]);
console.timeEnd('minify:js');
}