* first action!

node_modules/got/source/progress.js

@@ -0,0 +1,96 @@
+'use strict';
+const {Transform} = require('stream');
+
+module.exports = {
+	download(response, emitter, downloadBodySize) {
+		let downloaded = 0;
+
+		return new Transform({
+			transform(chunk, encoding, callback) {
+				downloaded += chunk.length;
+
+				const percent = downloadBodySize ? downloaded / downloadBodySize : 0;
+
+				// Let `flush()` be responsible for emitting the last event
+				if (percent < 1) {
+					emitter.emit('downloadProgress', {
+						percent,
+						transferred: downloaded,
+						total: downloadBodySize
+					});
+				}
+
+				callback(null, chunk);
+			},
+
+			flush(callback) {
+				emitter.emit('downloadProgress', {
+					percent: 1,
+					transferred: downloaded,
+					total: downloadBodySize
+				});
+
+				callback();
+			}
+		});
+	},
+
+	upload(request, emitter, uploadBodySize) {
+		const uploadEventFrequency = 150;
+		let uploaded = 0;
+		let progressInterval;
+
+		emitter.emit('uploadProgress', {
+			percent: 0,
+			transferred: 0,
+			total: uploadBodySize
+		});
+
+		request.once('error', () => {
+			clearInterval(progressInterval);
+		});
+
+		request.once('response', () => {
+			clearInterval(progressInterval);
+
+			emitter.emit('uploadProgress', {
+				percent: 1,
+				transferred: uploaded,
+				total: uploadBodySize
+			});
+		});
+
+		request.once('socket', socket => {
+			const onSocketConnect = () => {
+				progressInterval = setInterval(() => {
+					const lastUploaded = uploaded;
+					/* istanbul ignore next: see #490 (occurs randomly!) */
+					const headersSize = request._header ? Buffer.byteLength(request._header) : 0;
+					uploaded = socket.bytesWritten - headersSize;
+
+					// Don't emit events with unchanged progress and
+					// prevent last event from being emitted, because
+					// it's emitted when `response` is emitted
+					if (uploaded === lastUploaded || uploaded === uploadBodySize) {
+						return;
+					}
+
+					emitter.emit('uploadProgress', {
+						percent: uploadBodySize ? uploaded / uploadBodySize : 0,
+						transferred: uploaded,
+						total: uploadBodySize
+					});
+				}, uploadEventFrequency);
+			};
+
+			/* istanbul ignore next: hard to test */
+			if (socket.connecting) {
+				socket.once('connect', onSocketConnect);
+			} else if (socket.writable) {
+				// The socket is being reused from pool,
+				// so the connect event will not be emitted
+				onSocketConnect();
+			}
+		});
+	}
+};