Initial commit (by create-cloudflare CLI)

cool-dawn-3d3b/node_modules/decompress-response/index.js

@@ -0,0 +1,58 @@
+'use strict';
+const {Transform, PassThrough} = require('stream');
+const zlib = require('zlib');
+const mimicResponse = require('mimic-response');
+
+module.exports = response => {
+	const contentEncoding = (response.headers['content-encoding'] || '').toLowerCase();
+
+	if (!['gzip', 'deflate', 'br'].includes(contentEncoding)) {
+		return response;
+	}
+
+	// TODO: Remove this when targeting Node.js 12.
+	const isBrotli = contentEncoding === 'br';
+	if (isBrotli && typeof zlib.createBrotliDecompress !== 'function') {
+		response.destroy(new Error('Brotli is not supported on Node.js < 12'));
+		return response;
+	}
+
+	let isEmpty = true;
+
+	const checker = new Transform({
+		transform(data, _encoding, callback) {
+			isEmpty = false;
+
+			callback(null, data);
+		},
+
+		flush(callback) {
+			callback();
+		}
+	});
+
+	const finalStream = new PassThrough({
+		autoDestroy: false,
+		destroy(error, callback) {
+			response.destroy();
+
+			callback(error);
+		}
+	});
+
+	const decompressStream = isBrotli ? zlib.createBrotliDecompress() : zlib.createUnzip();
+
+	decompressStream.once('error', error => {
+		if (isEmpty && !response.readable) {
+			finalStream.end();
+			return;
+		}
+
+		finalStream.destroy(error);
+	});
+
+	mimicResponse(response, finalStream);
+	response.pipe(checker).pipe(decompressStream).pipe(finalStream);
+
+	return finalStream;
+};