import { encode } from "https://deno.land/std@0.159.0/encoding/ascii85.ts";import { compress } from "https://deno.land/x/lz4@v0.1.2/mod.ts";import { minify } from "https://esm.sh/terser@5.15.1";
const name = "deno_brotli";const target = "wasm.js";const encoder = new TextEncoder();
export async function build() { if (!(await Deno.stat("Cargo.toml")).isFile) { console.log(`the build script should be executed in the "${name}" root`); Deno.exit(1); }
console.log("building rust"); await Deno.run({ cmd: ["wasm-pack", "build", "--target", "web", "--release"], }).status();
const wasm = await Deno.readFile(`pkg/${name}_bg.wasm`); console.log(`read wasm (size: ${wasm.length} bytes)`); const compressed = compress(wasm); console.log( `compressed wasm using lz4 (reduction: ${ wasm.length - compressed.length } bytes, size: ${compressed.length})`, ); const encoded = encode(compressed) .replaceAll("\\", "\\\\") .replaceAll("`", "\\`"); console.log( `encoded wasm using base64, (increase: ${ encoded.length - compressed.length } bytes, size: ${encoded.length})`, );
console.log("inlining wasm and init code in js"); const init = await Deno.readTextFile(`pkg/${name}.js`); const source = `import * as lz4 from "https://deno.land/x/lz4@v0.1.2/mod.ts"; import { decode } from "https://deno.land/std@0.159.0/encoding/ascii85.ts"; export const source = lz4.decompress(decode(\`${encoded}\`)); ${init}`;
console.log("minifying js using terser"); const output = await minify(source, { mangle: { module: true }, output: { preamble: `// deno-lint-ignore-file\n// deno-fmt-ignore-file`, }, });
const reduction = new Blob([source]).size - new Blob([output.code!]).size; console.log(`minified js, size reduction: ${reduction} bytes`);
console.log(`writing output to file (${target})`); await Deno.writeFile(target, encoder.encode(output.code));
const outputFile = await Deno.stat(target); console.log( `output file (${target}), final size is: ${outputFile.size} bytes`, );}
if (import.meta.main) { await build();}