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'use strict'; const common = require('../common'); const assert = require('assert'); // This test ensures that Workers have the ability to get // their own command line flags. const { Worker } = require('worker_threads'); const { StringDecoder } = require('string_decoder'); const decoder = new StringDecoder('utf8'); // Do not use isMainThread so that this test itself can be run inside a Worker. if (!process.env.HAS_STARTED_WORKER) { process.env.HAS_STARTED_WORKER = 1; const w = new Worker(__filename, { execArgv: ['--trace-warnings'] }); w.stderr.on('data', common.mustCall((chunk) => { const error = decoder.write(chunk); assert.ok( /Warning: some warning[\s\S]*at Object\.<anonymous>/.test(error) ); })); new Worker( "require('worker_threads').parentPort.postMessage(process.execArgv)", { eval: true, execArgv: ['--trace-warnings'] }) .on('message', common.mustCall((data) => { assert.deepStrictEqual(data, ['--trace-warnings']); })); } else { process.emitWarning('some warning'); assert.deepStrictEqual(process.execArgv, ['--trace-warnings']); }