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build.ts
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build.ts
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import { readdir } from 'node:fs/promises';
import { basename } from 'node:path'; // eslint-disable-line unicorn/import-style
import { importPlugin } from '@ekscss/plugin-import';
import type { BuildArtifact } from 'bun';
import * as xcss from 'ekscss';
import * as lightningcss from 'lightningcss';
import * as terser from 'terser';
import { createManifest } from './manifest.config';
const mode = Bun.env.NODE_ENV;
const dev = mode === 'development';
/**
* Generate minified CSS from XCSS source.
*/
function compileCSS(src: string, from: string) {
const compiled = xcss.compile(src, {
from,
plugins: [importPlugin],
});
for (const warning of compiled.warnings) {
console.error('XCSS:', warning.message);
if (warning.file) {
console.log(
` at ${[warning.file, warning.line, warning.column]
.filter((x) => x != null)
.join(':')}`,
);
}
}
// TODO: Migrate to bun CSS handling (which is based on lightningcss).
const minified = lightningcss.transform({
filename: from,
code: new TextEncoder().encode(compiled.css),
minify: !dev,
// eslint-disable-next-line no-bitwise
targets: { chrome: 123 << 16 }, // matches manifest minimum_chrome_version
});
for (const warning of minified.warnings) {
console.error('CSS:', warning.message);
}
return minified.code;
}
/**
* Construct HTML and CSS files and save them to disk.
*/
async function makeHTML(pageName: string, stylePath: string) {
const styleSrc = await Bun.file(stylePath).text();
const css = compileCSS(styleSrc, stylePath);
const template = `
<!doctype html>
<meta charset=utf-8>
<meta name=google value=notranslate>
<title>New Tab</title>
<link href=${pageName}.css rel=stylesheet>
<script src=${pageName}.js type=module async></script>
`
.trim()
.replaceAll(/\n\s+/g, '\n'); // remove leading whitespace
await Bun.write(`dist/${pageName}.css`, css);
await Bun.write(`dist/${pageName}.html`, template);
}
/**
* Compile all themes, combine into a single JSON file, and save it to disk.
*/
async function makeThemes() {
const themeFiles = await readdir('src/css/themes');
const themes: Record<string, string> = {};
for (const theme of themeFiles.sort()) {
if (theme.endsWith('.xcss')) {
const path = `src/css/themes/${theme}`;
const code = await Bun.file(path).text();
themes[basename(theme, '.xcss')] = compileCSS(code, path).toString();
}
}
await Bun.write('dist/themes.json', JSON.stringify(themes));
}
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
// XXX: Comment out to keep performance markers for debugging.
pure_funcs: ['performance.mark', 'performance.measure'],
passes: 3,
},
mangle: {
properties: {
regex: /^\$\$|^__click$/,
},
},
});
await Bun.write(artifact.path, result.code ?? '');
}
console.time('prebuild');
await Bun.$`rm -rf dist`;
await Bun.$`cp -r static dist`;
console.timeEnd('prebuild');
// Extension manifest
console.time('manifest');
await Bun.write('dist/manifest.json', JSON.stringify(createManifest()));
console.timeEnd('manifest');
console.time('html+css');
await makeHTML('newtab', 'src/css/newtab.xcss');
await makeHTML('settings', 'src/css/settings.xcss');
console.timeEnd('html+css');
console.time('themes');
await makeThemes();
console.timeEnd('themes');
// New Tab & Settings apps
console.time('build');
const out = await Bun.build({
entrypoints: ['src/newtab.ts', 'src/settings.ts'],
outdir: 'dist',
target: 'browser',
minify: !dev,
sourcemap: dev ? 'linked' : 'none',
});
console.timeEnd('build');
console.log(out);
// Background service worker script
console.time('build2');
const out2 = await Bun.build({
entrypoints: ['src/sw.ts'],
outdir: 'dist',
target: 'browser',
minify: !dev,
sourcemap: dev ? 'linked' : 'none',
});
console.timeEnd('build2');
console.log(out2);
if (!dev) {
console.time('minify');
await minifyJS(out.outputs[0]);
await minifyJS(out.outputs[1]);
await minifyJS(out2.outputs[0]);
console.timeEnd('minify');
}