repro_obug_format.mjs
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repro_obug_format.mjs
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	import { formatWithOptions } from 'node:util';
	import process from 'node:process';

	function humanize(value) {
	if (value >= 1000) return `${(value / 1000).toFixed(1)}s`;
	return `${value}ms`;
	}

	function writeDebugLine(namespace, args, diff) {
	const prefix = ` \u001B[32;1m${namespace} \u001B[0m`;
	args[0] = prefix + args[0].split('\n').join(`\n${prefix}`);
	args.push(`\u001B[32m+${humanize(diff)}\u001B[0m`);
	return formatWithOptions({}, ...args);
	}

	const raw = formatWithOptions({}, '%s %s : %s', 'fn', '/', '/foo.png');
	const debugLine = writeDebugLine('repro:test', ['%s %s : %s', 'fn', '/', '/foo.png'], 0);

	console.log('raw:');
	console.log(raw);
	console.log('debug:');
	console.log(debugLine);

	if (raw !== 'fn / : /foo.png') {
	throw new Error(`util.formatWithOptions mismatch: ${JSON.stringify(raw)}`);
	}

	if (!debugLine.includes('fn / : /foo.png')) {
	throw new Error(`obug-style line mismatch: ${JSON.stringify(debugLine)}`);
	}

	process.exit(0);

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