@stryker-mutator/tap-runner/src/setup/hook.cts

A plugin to use the TAP (test anything protocol) test runner in Stryker, the JavaScript mutation testing framework

import fs from 'fs';

import {
  tempTapOutputFileName,
  strykerDryRun,
  strykerHitLimit,
  strykerNamespace,
} from './env.cjs';

const strykerGlobalNamespace =
  (process.env[strykerNamespace] as
    | '__stryker__'
    | '__stryker2__'
    | undefined) ?? '__stryker__';
const dryRun = process.env[strykerDryRun] === 'true';
const hitLimit = process.env[strykerHitLimit]
  ? +process.env[strykerHitLimit]
  : undefined;

global[strykerGlobalNamespace] = {};

if (hitLimit) {
  global[strykerGlobalNamespace].hitLimit = hitLimit;
  global[strykerGlobalNamespace].hitCount = 0;
}

process.on('exit', finalCleanup);

(['SIGABRT', 'SIGINT', 'SIGHUP', 'SIGTERM'] as const).forEach((signal) =>
  process.on(signal, (_: unknown, signalNumber: number) => {
    process.exit(128 + signalNumber);
  }),
);

function finalCleanup() {
  if (!dryRun) {
    delete global[strykerGlobalNamespace]!.mutantCoverage;
  }
  fs.writeFileSync(
    tempTapOutputFileName(process.pid),
    JSON.stringify(global[strykerGlobalNamespace]),
  );
}