[REGRESSION]: SIGINT handler is not called

[aslushnikov]

💥 Regression Report

• OS: Mac
• Jest version: v26.0.1

SIGINT handler is not called in jest scripts.

I'm coming here originally from microsoft/playwright#2261 (and we had some previous history with this at puppeteer/puppeteer#2428)

Last working version

Definitely works for me in v20.0.0

To Reproduce

1. Save the following as example.test.js:

// this is `example.test.js`

process.on('SIGINT', () => console.log('SIGINT was called!'));

test("demo", async () => {
  console.log('running test');
  await new Promise(() => {});
});

2. Run test: npx jest@v26.0.1

3. Once running test is printed, hit Ctrl-C.

Expected behavior

Expected to see SIGINT was called! in the console

Link to repl or repo (highly encouraged)

Here's the repo with a similar repro. Due to this bug, Playwright doesn't handle SIGINT and doesn't close browser:

https://github.com/jperl/pw-close-repro

Run npx envinfo --preset jest

System:
OS: macOS 10.15.4
CPU: (12) x64 Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz
Binaries:
Node: 14.2.0 - ~/.nvm/versions/node/v14.2.0/bin/node
npm: 6.14.4 - ~/.nvm/versions/node/v14.2.0/bin/npm
npmPackages:
jest: ^26.0.0 => 26.0.1

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