feat: add precompress option to adapter-static

.changeset/healthy-pandas-pull.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-static': minor
+---
+
+add precompress option to adapter-static

packages/adapter-static/index.d.ts

@@ -4,6 +4,7 @@ interface AdapterOptions {
  pages?: string;
  assets?: string;
  fallback?: string;
+ precompress?: boolean;
 }
 
 declare function plugin(options?: AdapterOptions): Adapter;

packages/adapter-static/index.js

@@ -1,5 +1,13 @@
+import { createReadStream, createWriteStream, statSync } from 'fs';
+import { pipeline } from 'stream';
+import glob from 'tiny-glob';
+import { promisify } from 'util';
+import zlib from 'zlib';
+
+const pipe = promisify(pipeline);
+
 /** @type {import('.')} */
-export default function ({ pages = 'build', assets = pages, fallback } = {}) {
+export default function ({ pages = 'build', assets = pages, fallback, precompress = true } = {}) {
  return {
  name: '@sveltejs/adapter-static',
 
@@ -15,6 +23,57 @@ export default function ({ pages = 'build', assets = pages, fallback } = {}) {
  all: !fallback,
  dest: pages
  });
+
+ if (precompress) {
+ if (pages === assets) {
+ utils.log.minor('Compressing assets and pages');
+ await compress(assets);
+ } else {
+ utils.log.minor('Compressing assets');
+ await compress(assets);
+
+ utils.log.minor('Compressing pages');
+ await compress(pages);
+ }
+ }
  }
  };
 }
+
+/**
+ * @param {string} directory
+ */
+async function compress(directory) {
+ const files = await glob('**/*.{html,js,json,css,svg,xml}', {
+ cwd: directory,
+ dot: true,
+ absolute: true,
+ filesOnly: true
+ });
+
+ await Promise.all(
+ files.map((file) => Promise.all([compress_file(file, 'gz'), compress_file(file, 'br')]))
+ );
+}
+
+/**
+ * @param {string} file
+ * @param {'gz' | 'br'} format
+ */
+async function compress_file(file, format = 'gz') {
+ const compress =
+ format == 'br'
+ ? zlib.createBrotliCompress({
+ params: {
+ [zlib.constants.BROTLI_PARAM_MODE]: zlib.constants.BROTLI_MODE_TEXT,
+ [zlib.constants.BROTLI_PARAM_QUALITY]: zlib.constants.BROTLI_MAX_QUALITY,
+ [zlib.constants.BROTLI_PARAM_SIZE_HINT]: statSync(file).size
+ }
+ })
+ : zlib.createGzip({ level: zlib.constants.Z_BEST_COMPRESSION });
+
+ const source = createReadStream(file);
+ const destination = createWriteStream(`${file}.${format}`);
+
+ await pipe(source, compress, destination);
+}

packages/adapter-static/package.json

@@ -24,6 +24,9 @@
  "check-format": "prettier --check . --config ../../.prettierrc --ignore-path .gitignore",
  "test": "uvu test test.js"
  },
+ "dependencies": {
+ "tiny-glob": "^0.2.9"
+ },
  "devDependencies": {
  "@sveltejs/kit": "workspace:*",
  "playwright-chromium": "^1.17.0",