Add ability to debug Jest test from VSCode (#291)

thx to @diberry!

.vscode/launch.json

@@ -3,13 +3,43 @@
     // Hover to view descriptions of existing attributes.
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
-    "configurations": [        
+    "configurations": [
         {
             "type": "node",
             "request": "attach",
             "name": "Attach by Process ID",
             "processId": "${command:PickProcess}",
             "protocol": "inspector"
-        }
+        },
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Jest Current File",
+            "program": "${workspaceFolder}/node_modules/.bin/jest",
+            "args": [
+                "${fileBasenameNoExtension}",
+                "--detectOpenHandles"
+            ],
+            "console": "integratedTerminal",
+            "internalConsoleOptions": "neverOpen",
+            "disableOptimisticBPs": true,
+            "windows": {
+                "program": "${workspaceFolder}/node_modules/jest/bin/jest",
+            }
+        },
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Jest all",
+            "runtimeExecutable": "npm",
+            "runtimeArgs": [
+                "run-script",
+                "test"
+            ],
+            "port": 9229,
+            "skipFiles": [
+                "<node_internals>/**"
+            ]
+        },
     ]
 }