Improve dev experience (TypeStrong#1854)

* WIP switch to yarn

* WIP switch to yarn

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* confirm node and TS versions on CI

* Fix

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* shrink the test matrix more

* fix

* fix

Author: Hoaiui

.vscode/launch.json

@@ -1,5 +1,42 @@
 {
   "configurations": [
+    {
+      "name": "Electron Main",
+      "program": "${workspaceFolder}/main.js",
+      "request": "launch",
+      "runtimeExecutable": "${workspaceFolder}/node_modules/.bin/electron",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "type": "node"
+    },
+    {
+      "name": "Launch Program",
+      "program": "${workspaceFolder}/app.js",
+      "request": "launch",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "type": "node"
+    },
+    {
+      "name": "Launch Program",
+      "program": "${workspaceFolder}/app.js",
+      "request": "launch",
+      "skipFiles": [
+        "<node_internals>/**"
+      ],
+      "type": "node"
+    },
+  {
+    "name": "Launch Program",
+    "program": "${workspaceFolder}/app.js",
+    "request": "launch",
+    "skipFiles": [
+      "<node_internals>/**"
+    ],
+    "type": "node"
+  },
     {
       "name": "Debug AVA test file",
       "type": "node",