Improve OSS plugin template

Summary:
Based https://github.com/facebook/flipper/issues/1866 and running `npx flipper-plugin init` locally. Doesn't address the original issue

Fixes #1866

Reviewed By: passy

Differential Revision: D26147089

fbshipit-source-id: 608dc92c5ccc741b6e760ea5a5034f9444e951b7

desktop/pkg/src/__tests__/runInit.node.ts

@@ -70,7 +70,7 @@ test('It generates the correct files', async () => {
         \\"prepack\\": \\"flipper-pkg lint && flipper-pkg bundle\\",
         \\"build\\": \\"flipper-pkg bundle\\",
         \\"watch\\": \\"flipper-pkg bundle --watch\\",
-        \\"test\\": \\"jest\\"
+        \\"test\\": \\"jest --no-watchman\\"
       },
       \\"peerDependencies\\": {
         \\"flipper\\": \\"latest\\",
@@ -80,6 +80,7 @@ test('It generates the correct files', async () => {
       \\"devDependencies\\": {
         \\"@babel/preset-react\\": \\"latest\\",
         \\"@babel/preset-typescript\\": \\"latest\\",
+        \\"@testing-library/react\\": \\"latest\\",
         \\"@types/jest\\": \\"latest\\",
         \\"@types/react\\": \\"latest\\",
         \\"@types/react-dom\\": \\"latest\\",
@@ -87,7 +88,8 @@ test('It generates the correct files', async () => {
         \\"flipper\\": \\"latest\\",
         \\"flipper-plugin\\": \\"latest\\",
         \\"flipper-pkg\\": \\"latest\\",
-        \\"jest\\": \\"latest\\"
+        \\"jest\\": \\"latest\\",
+        \\"typescript\\": \\"latest\\"
       }
     }
     ",

desktop/pkg/templates/plugin/package.json.template

@@ -16,7 +16,7 @@
     "prepack": "flipper-pkg lint && flipper-pkg bundle",
     "build": "flipper-pkg bundle",
     "watch": "flipper-pkg bundle --watch",
-    "test": "jest"
+    "test": "jest --no-watchman"
   },
   "peerDependencies": {
     "flipper": "latest",
@@ -26,6 +26,7 @@
   "devDependencies": {
     "@babel/preset-react": "latest",
     "@babel/preset-typescript": "latest",
+    "@testing-library/react": "latest",
     "@types/jest": "latest",
     "@types/react": "latest",
     "@types/react-dom": "latest",
@@ -33,6 +34,7 @@
     "flipper": "latest",
     "flipper-plugin": "latest",
     "flipper-pkg": "latest",
-    "jest": "latest"
+    "jest": "latest",
+    "typescript": "latest"
   }
 }