Revert "Speed up TypeScript v2 (#6406)" (#6585)

This reverts commit 6a5b3cdaaa.

test/fixtures/typescript-typecheck/index.test.js

@@ -1,33 +0,0 @@
-const testSetup = require('../__shared__/test-setup');
-const puppeteer = require('puppeteer');
-
-const expectedErrorMsg = `Argument of type '123' is not assignable to parameter of type 'string'`;
-
-test('shows error overlay in browser', async () => {
-  const { port, done } = await testSetup.scripts.start();
-
-  const browser = await puppeteer.launch({ headless: true });
-  try {
-    const page = await browser.newPage();
-    await page.goto(`http://localhost:${port}/`);
-    await page.waitForSelector('iframe', { timeout: 5000 });
-    const overlayMsg = await page.evaluate(() => {
-      const overlay = document.querySelector('iframe').contentWindow;
-      return overlay.document.body.innerHTML;
-    });
-    expect(overlayMsg).toContain(expectedErrorMsg);
-  } finally {
-    browser.close();
-    done();
-  }
-});
-
-test('shows error in console (dev mode)', async () => {
-  const { stderr } = await testSetup.scripts.start({ smoke: true });
-  expect(stderr).toContain(expectedErrorMsg);
-});
-
-test('shows error in console (prod mode)', async () => {
-  const { stderr } = await testSetup.scripts.build();
-  expect(stderr).toContain(expectedErrorMsg);
-});

test/fixtures/typescript-typecheck/package.json

@@ -1,9 +0,0 @@
-{
-  "dependencies": {
-    "@types/react": "*",
-    "@types/react-dom": "*",
-    "react": "*",
-    "react-dom": "*",
-    "typescript": "3.1.3"
-  }
-}

test/fixtures/typescript-typecheck/src/App.tsx

@@ -1,13 +0,0 @@
-import * as React from 'react';
-
-class App extends React.Component {
-  render() {
-    return <div>{format(123)}</div>;
-  }
-}
-
-function format(value: string) {
-  return value;
-}
-
-export default App;

test/fixtures/typescript-typecheck/src/index.tsx

@@ -1,5 +0,0 @@
-import * as React from 'react';
-import * as ReactDOM from 'react-dom';
-import App from './App';
-
-ReactDOM.render(<App />, document.getElementById('root'));