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x/lol_html/build.ts

Low output latency streaming HTML parser/rewriter with CSS selector-based API in Deno, via Webassembly.
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import { dim } from "https://deno.land/std@0.128.0/fmt/colors.ts";import { encode } from "https://deno.land/std@0.128.0/encoding/base64.ts";import { ensureDir } from "https://deno.land/std@0.128.0/fs/ensure_dir.ts";import { compress } from "https://deno.land/x/lz4@v0.1.2/mod.ts";
async function run(cmd: string[]) { const p = Deno.run({ cmd, stdout: "inherit", stderr: "inherit", }); const status = await p.status(); p.close(); return status.success;}
if (import.meta.main) { const ok = await run(["wasm-pack", "build", "--target", "web"]); if (ok) { const wasmData = await Deno.readFile("./pkg/deno_lol_html_bg.wasm"); const jsCode = await Deno.readTextFile("./pkg/deno_lol_html.js"); const dtsCode = await Deno.readTextFile("./pkg/deno_lol_html.d.ts"); let prevWasmSize = 0; try { prevWasmSize = (await Deno.stat("./wasm.js")).size; } catch (e) {} await ensureDir("./dist"); await Deno.writeTextFile( "./wasm.js", `import { decompress } from "https://deno.land/x/lz4@v0.1.2/mod.ts";\nexport default () => decompress(Uint8Array.from(atob("${ encode(compress(wasmData)) }"), c => c.charCodeAt(0)));`, ); await Deno.writeTextFile( "./mod.js", jsCode .replace(`import * as __wbg_star0 from 'env';`, "") .replace(`imports['env'] = __wbg_star0;`, `imports['env'] = { now: () => Date.now() };`), ); await Deno.writeTextFile("./types.d.ts", dtsCode); await run(["deno", "fmt", "-q", "./mod.js", "./types.d.ts"]); const wasmSize = (await Deno.stat("./wasm.js")).size; const increased = ((wasmSize - prevWasmSize) / prevWasmSize) * 100; if (increased) { console.log( `${dim("[INFO]")}: wasm.js ${increased.toFixed(2)}% (${ [prevWasmSize, wasmSize].filter(Boolean).map((n) => (n / (1024 * 1024)).toFixed(2) + "MB") .join(" -> ") })`, ); } }}