add launch & debug configurations

.vscode/launch.json

@@ -0,0 +1,20 @@
+{
+	// Use IntelliSense to learn about possible attributes.
+	// Hover to view descriptions of existing attributes.
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "node",
+			"request": "launch",
+			"name": "Launch Program",
+			"program": "${workspaceFolder}/out/vsce",
+			"args": [
+				"--version"
+			],
+			"sourceMaps": true,
+			"outputCapture": "std",
+			"preLaunchTask": "compile"
+		}
+	]
+}

.vscode/tasks.json

@@ -0,0 +1,16 @@
+{
+	// See https://go.microsoft.com/fwlink/?LinkId=733558
+	// for the documentation about the tasks.json format
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "gulp",
+			"task": "compile",
+			"label": "compile",
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		}
+	]
+}

gulpfile.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const path = require('path');
 const gulp = require('gulp');
 const gts = require('gulp-typescript');
 const sm = require('gulp-sourcemaps');
@@ -23,7 +24,12 @@ function compile() {
 		.pipe(project());
 
 	const js = ts.js
-		.pipe(sm.write('.'));
+		.pipe(sm.write('.', {
+			includeContent: false, sourceRoot: file => {
+				const dirname = path.dirname(file.relative);
+				return dirname === '.' ? '../src' : ('../src/' + dirname);
+			}
+		}));
 
 	const api = ts.dts
 		.pipe(filter('**/api.d.ts'));
@@ -48,7 +54,7 @@ gulp.task('test', ['compile'], test);
 gulp.task('just-test', ['just-compile'], test);
 
 function watch(task) {
-	return () => gulp.watch(['src/**', 'typings/**'], [task]);
+	return cb => gulp.watch(['src/**', 'typings/**'], [task]);
 }
 
 gulp.task('watch', ['compile'], watch('just-compile'));