TS migration. #2288. (#2328)

* Added TS. Updated build and linting config. Added types.

* [ts-migrate][.] Rename files from JS/JSX to TS/TSX

Co-authored-by: ts-migrate <>

* [ts-migrate][.] Run TS Migrate

Co-authored-by: ts-migrate <>

* Corrected files mangled by ts-migrate.

* Updated lint config, minor linting.

* Re-enabled Husky.

* Updated tests and config.

* Reverted webpack devtool config.

* Removed obsolete snapshots.

* Added annotations snap.

* Updated tsconfig includes wrt linting.

* Removed ts-migrate.

Co-authored-by: Timmy Huang <tihuan@users.noreply.github.com>

client/tsconfig.json

@@ -0,0 +1,32 @@
+{
+    "compilerOptions": {
+        "allowJs": true,
+        "esModuleInterop": true,
+        // Allow @connect
+        "experimentalDecorators": true,
+        // Ensure Babel can safely transpile files
+        "isolatedModules": true,
+        "jsx": "preserve",
+        "lib": ["dom", "es2020"],
+        "module": "esnext",
+        "moduleResolution": "node",
+        "noEmit": true,
+        "noUnusedLocals": true,
+        "noUnusedParameters": true,
+        "skipLibCheck": true,
+        "strict": true,
+        "target": "esnext",
+        "types": ["jest", "puppeteer", "jest-environment-puppeteer", "expect-puppeteer"],
+        "forceConsistentCasingInFileNames": true,
+        "resolveJsonModule": true
+    },
+    "include": [
+        "src/**/*",
+        "configuration/**/*",
+        "__tests__/**/*",
+        "jest-puppeteer.config.js"
+    ],
+    "exclude": [
+        "__tests__/e2e/__snapshots__/**/*",
+    ]
+}