initial commit

node_modules/gzip-size/index.js

@@ -0,0 +1,65 @@
+import fs from 'node:fs';
+import stream from 'node:stream';
+import zlib from 'node:zlib';
+import {promisify} from 'node:util';
+import duplexer from 'duplexer';
+
+const getOptions = options => ({level: 9, ...options});
+const gzip = promisify(zlib.gzip);
+
+export async function gzipSize(input, options) {
+	if (!input) {
+		return 0;
+	}
+
+	const data = await gzip(input, getOptions(options));
+	return data.length;
+}
+
+export function gzipSizeSync(input, options) {
+	return zlib.gzipSync(input, getOptions(options)).length;
+}
+
+export function gzipSizeFromFile(path, options) {
+	// TODO: Use `stream.pipeline` here.
+
+	return new Promise((resolve, reject) => {
+		const stream = fs.createReadStream(path);
+		stream.on('error', reject);
+
+		const gzipStream = stream.pipe(gzipSizeStream(options));
+		gzipStream.on('error', reject);
+		gzipStream.on('gzip-size', resolve);
+	});
+}
+
+export function gzipSizeFromFileSync(path, options) {
+	return gzipSizeSync(fs.readFileSync(path), options);
+}
+
+export function gzipSizeStream(options) {
+	// TODO: Use `stream.pipeline` here.
+
+	const input = new stream.PassThrough();
+	const output = new stream.PassThrough();
+	const wrapper = duplexer(input, output);
+
+	let gzipSize = 0;
+	const gzip = zlib.createGzip(getOptions(options))
+		.on('data', buf => {
+			gzipSize += buf.length;
+		})
+		.on('error', () => {
+			wrapper.gzipSize = 0;
+		})
+		.on('end', () => {
+			wrapper.gzipSize = gzipSize;
+			wrapper.emit('gzip-size', gzipSize);
+			output.end();
+		});
+
+	input.pipe(gzip);
+	input.pipe(output, {end: false});
+
+	return wrapper;
+}