28 lines
870 B
TypeScript
28 lines
870 B
TypeScript
/**
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* Structured logger — writes newline-delimited JSON to stdout/stderr.
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*/
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type LogLevel = 'info' | 'warn' | 'error';
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interface LogEntry {
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level: LogLevel;
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time: string;
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msg: string;
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[key: string]: unknown;
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}
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function write(stream: typeof process.stdout | typeof process.stderr, entry: LogEntry): void {
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stream.write(JSON.stringify(entry) + '\n');
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}
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export const logger = {
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info(msg: string, data?: Record<string, unknown>): void {
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write(process.stdout, { level: 'info', time: new Date().toISOString(), msg, ...data });
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},
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warn(msg: string, data?: Record<string, unknown>): void {
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write(process.stderr, { level: 'warn', time: new Date().toISOString(), msg, ...data });
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},
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error(msg: string, data?: Record<string, unknown>): void {
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write(process.stderr, { level: 'error', time: new Date().toISOString(), msg, ...data });
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},
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};
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