message: [cli] Add a test case for resolving default "typescript" version in `@vercel/node`
  Adds a test case for (it got auto-merged too quickly).
diff: import ms from 'ms';
  +import os from 'os';
  import fs from 'fs-extra';
  import test from 'ava';
  import { join, resolve, delimiter } from 'path';
  @@ -526,6 +527,35 @@ test('[vercel dev] reflects changes to config and env without restart', async t
  }
  });
  +test('[vercel dev] `@vercel/node` TypeScript should be resolved by default', async t => {
  + // The purpose of this test is to test that `@vercel/node` can properly
  + // resolve the default "typescript" module when the project doesn't include
  + // its own version. To properly test for this, a fixture needs to be created
  + // *outside* of the `vercel` repo, since otherwise the root-level
  + // "node_modules/typescript" is resolved as relative to the project, and
  + // not relative to `@vercel/node` which is what we are testing for here.
  + const dir = join(os.tmpdir(), 'vercel-node-typescript-resolve-test');
  + const apiDir = join(dir, 'api');
  + await fs.mkdirp(apiDir);
  + await fs.writeFile(
  + join(apiDir, 'hello.js'),
  + 'export default (req, res) => { res.end("world"); }'
  + );
  +
  + const { dev, port, readyResolver } = await testFixture(dir);
  +
  + try {
  + await readyResolver;
  +
  + const res = await fetch(`http://localhost:${port}/api/hello`);
  + const body = await res.text();
  + t.is(body, 'world');
  + } finally {
  + await dev.kill('SIGTERM');
  + await fs.remove(dir);
  + }
  +});
  +
  test(
  '[vercel dev] validate routes that use `check: true`',
  testFixtureStdio('routes-check-true', async testPath => {
  