Fix the issue that npm preLaunchTask does not exit (#519)

Signed-off-by: Jinbo Wang <jinbwan@microsoft.com>

.vscode/launch.json

@@ -11,7 +11,7 @@
             "stopOnEntry": false,
             "sourceMaps": true,
             "outFiles": [ "${workspaceRoot}/out/src/**/*.js" ],
-            "preLaunchTask": "npm"
+            "preLaunchTask": "npm: watch"
         },
         {
             "name": "Launch Tests",
@@ -22,7 +22,7 @@
             "stopOnEntry": false,
             "sourceMaps": true,
             "outFiles": [ "${workspaceRoot}/out/test/**/*.js" ],
-            "preLaunchTask": "npm"
+            "preLaunchTask": "npm: watch"
         }
     ]
 }

.vscode/tasks.json

@@ -9,27 +9,19 @@
 // A task runner that calls a custom npm script that compiles the extension.
 {
     "version": "2.0.0",
-
+	"tasks": [
-    // we want to run npm
+		{
-    "command": "npm",
+			"type": "npm",
-
+			"script": "watch",
-    // the command is a shell script
+			"problemMatcher": "$tsc-watch",
-    "type": "shell",
-
-    // show the output window only if unrecognized errors occur.
-    "presentation": {
-        "echo": true,
-        "reveal": "silent",
-        "focus": false,
-        "panel": "shared"
-    },
-
-    // we run the custom script "compile" as defined in package.json
-    "args": ["run", "compile", "--loglevel", "silent"],
-
-    // The tsc compiler is started in watching mode
 			"isBackground": true,
-
+			"presentation": {
-    // use the standard tsc in watch mode problem matcher to find compile problems in the output.
+				"reveal": "never"
-    "problemMatcher": "$tsc-watch"
+			},
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		}
+	]
 }

package.json

@@ -407,7 +407,7 @@
   },
   "scripts": {
     "vscode:prepublish": "tsc -p ./",
-    "compile": "tsc -watch -p ./",
+    "watch": "tsc -watch -p ./",
     "postinstall": "node ./node_modules/vscode/bin/install",
     "test": "node ./scripts/download-vscode-for-system-tests && node ./scripts/install-vsix-dependencies redhat.java && node ./scripts/install-vsix-dependencies vscode-java-debug-0.16.0.vsix && node ./scripts/run-vscode-tests"
   },