Files F97922100

index.js
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Created: Tue, Jan 7, 14:34

index.js
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	'use strict';
	const fs = require('fs');
	const stream = require('stream');
	const zlib = require('zlib');
	const {promisify} = require('util');
	const duplexer = require('duplexer');

	const getOptions = options => ({level: 9, ...options});
	const gzip = promisify(zlib.gzip);

	module.exports = async (input, options) => {
	if (!input) {
	return 0;
	}

	const data = await gzip(input, getOptions(options));
	return data.length;
	};

	module.exports.sync = (input, options) => zlib.gzipSync(input, getOptions(options)).length;

	module.exports.stream = options => {
	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;
	};

	module.exports.file = (path, options) => {
	return new Promise((resolve, reject) => {
	const stream = fs.createReadStream(path);
	stream.on('error', reject);

	const gzipStream = stream.pipe(module.exports.stream(options));
	gzipStream.on('error', reject);
	gzipStream.on('gzip-size', resolve);
	});
	};

	module.exports.fileSync = (path, options) => module.exports.sync(fs.readFileSync(path), options);

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