decompress.js
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decompress.js
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	// @flow

	import decompress from 'brotli/decompress.js';
	import { Buffer } from 'buffer';
	import invariant from 'invariant';

	import type { CompressedData } from 'lib/types/compression-types.js';

	function decompressMessage(message: CompressedData): string {
	invariant(message.algo === 'brotli+base64', 'only supports brotli+base64');
	const inBuffer = Buffer.from(message.data, 'base64');
	const decompressed = decompress(inBuffer);
	const outBuffer = Buffer.from(decompressed);
	return outBuffer.toString('utf-8');
	}

	export { decompressMessage };