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node_modules/pino/test/transport/crash.test.js

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+'use strict'
+
+const { join } = require('node:path')
+const { once } = require('node:events')
+const { setImmediate: immediate } = require('node:timers/promises')
+const { test } = require('tap')
+const pino = require('../../')
+
+test('pino.transport emits error if the worker exits with 0 unexpectably', async ({ same, teardown, equal }) => {
+  // This test will take 10s, because flushSync waits for 10s
+  const transport = pino.transport({
+    target: join(__dirname, '..', 'fixtures', 'crashing-transport.js'),
+    sync: true
+  })
+  teardown(transport.end.bind(transport))
+
+  await once(transport, 'ready')
+
+  let maybeError
+  transport.on('error', (err) => {
+    maybeError = err
+  })
+
+  const logger = pino(transport)
+  for (let i = 0; i < 100000; i++) {
+    logger.info('hello')
+  }
+
+  await once(transport.worker, 'exit')
+
+  await immediate()
+
+  same(maybeError.message, 'the worker has exited')
+})