test_process_emit_warning.cjs
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test_process_emit_warning.cjs
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	const { spawnSync } = require('child_process');

	function assertIncludes(haystack, needle, label) {
	if (!haystack.includes(needle)) {
	throw new Error(`${label}: expected ${JSON.stringify(haystack)} to include ${JSON.stringify(needle)}`);
	}
	}

	function assertNotIncludes(haystack, needle, label) {
	if (haystack.includes(needle)) {
	throw new Error(`${label}: expected ${JSON.stringify(haystack)} not to include ${JSON.stringify(needle)}`);
	}
	}

	function assertMatch(haystack, pattern, label) {
	if (!pattern.test(haystack)) {
	throw new Error(`${label}: expected ${JSON.stringify(haystack)} to match ${pattern}`);
	}
	}

	function run(source) {
	const result = spawnSync(process.execPath, ['-e', source]);
	if (result.error) throw result.error;
	if (result.status !== 0) {
	throw new Error(`child exited ${result.status}\nstdout:\n${result.stdout}\nstderr:\n${result.stderr}`);
	}
	return {
	stdout: String(result.stdout),
	stderr: String(result.stderr),
	};
	}

	const withDetail = run(`
	process.emitWarning('Something happened!', {
	code: 'Custom_Warning',
	detail: 'Additional information about warning'
	});
	`);

	assertMatch(
	withDetail.stderr,
	/\\(ant:\\d+\\) \\[Custom_Warning\\] Warning: Something happened!\\n/,
	'emitWarning formats code, type, and message'
	);
	assertIncludes(
	withDetail.stderr,
	'Additional information about warning\n',
	'emitWarning prints detail'
	);
	assertNotIncludes(
	withDetail.stderr,
	'[Custom_Warning] : Something happened!',
	'emitWarning avoids the old empty type formatting'
	);

	const listenerPayload = run(`
	process.on('warning', warning => {
	console.log([warning.name, warning.message, warning.code, warning.detail].join('\|'));
	});
	process.emitWarning('msg', { code: 'C', detail: 'd' });
	`);

	assertIncludes(listenerPayload.stderr, '[C] Warning: msg\n', 'emitWarning still writes default warning output');
	assertIncludes(listenerPayload.stdout, 'Warning\|msg\|C\|d\n', 'emitWarning emits a warning object');

	console.log('process.emitWarning formatting ok');

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