fix: We need to process typescript now.

Some upstream projects now have tsx files in them that we need to be
able to process. In particular the StudioHeader file from
frontend-component-header.  We add tsconfig support and fix eslint to
now throw errors now that the typescript-eslint rules are running.

Author: feanil

.eslintignore

@@ -1,4 +1,6 @@
 coverage/*
 dist/
 node_modules/
-jest.config.js
+jest.config.js
+*.config.js
+.eslintrc.js

src/index.test.jsx

@@ -3,7 +3,7 @@ import {
 } from '@edx/frontend-platform';
 
 // Jest needs this for module resolution
-import * as app from '.'; // eslint-disable-line no-unused-vars
+import * as app from '.'; // eslint-disable-line @typescript-eslint/no-unused-vars
 
 // These need to be var not let so they get hoisted
 // and can be used by jest.mock (which is also hoisted)

tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "@edx/typescript-config",
+  "compilerOptions": {
+    "rootDir": ".",
+    "outDir": "dist"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["*.js", ".eslintrc.js", "dist", "node_modules"]
+}