add snapshot as build step instead of gulp task

build/lib/snapshotLoader.ts

@@ -0,0 +1,62 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+namespace snaps {
+
+	const fs = require('fs');
+	const path = require('path');
+	const os = require('os');
+	const cp = require('child_process');
+
+	const mksnapshot = path.join(__dirname, `../../node_modules/.bin/${process.platform === 'win32' ? 'mksnapshot.cmd' : 'mksnapshot'}`);
+	const product = require('../../product.json');
+
+	//
+	let loaderFilepath: string;
+	let startupBlobFilepath: string;
+
+	switch (process.platform) {
+		case 'darwin':
+			loaderFilepath = `VSCode-darwin/${product.nameLong}.app/Contents/Resources/app/out/vs/loader.js`;
+			startupBlobFilepath = `VSCode-darwin/${product.nameLong}.app/Contents/Frameworks/Electron Framework.framework/Resources/snapshot_blob.bin`;
+			break;
+
+		case 'win32':
+		case 'linux':
+			loaderFilepath = `VSCode-${process.platform}/loader.js`;
+			startupBlobFilepath = `VSCode-${process.platform}/snapshot_blob.bin`;
+	}
+
+	loaderFilepath = path.join(__dirname, '../../../', loaderFilepath);
+	startupBlobFilepath = path.join(__dirname, '../../../', startupBlobFilepath);
+
+	snapshotLoader(loaderFilepath, startupBlobFilepath);
+
+	function snapshotLoader(loaderFilepath: string, startupBlobFilepath: string): void {
+
+		const inputFile = fs.readFileSync(loaderFilepath);
+		const wrappedInputFile = `
+		var Monaco_Loader_Init;
+		(function() {
+			var doNotInitLoader = true;
+			${inputFile.toString()};
+			Monaco_Loader_Init = function() {
+				AMDLoader.init();
+				CSSLoaderPlugin.init();
+				NLSLoaderPlugin.init();
+
+				return define;
+			}
+		})();
+		`;
+		const wrappedInputFilepath = path.join(os.tmpdir(), 'wrapped-loader.js');
+		console.log(wrappedInputFilepath);
+		fs.writeFileSync(wrappedInputFilepath, wrappedInputFile);
+
+		cp.execFileSync(mksnapshot, [wrappedInputFilepath, `--startup_blob`, startupBlobFilepath]);
+	}
+}