import { isObject } from "./utils.js";
interface Logger {
error(message: string, error?: Error | undefined): void;
warn(message: string): void;
info(message: string): void;
}
class DefaultLogger implements Logger {
private name: string | undefined;
private logsToStderr: boolean;
constructor(
name: string | undefined = undefined,
{ logsToStderr = false }: { logsToStderr?: boolean } = {}
) {
this.name = name;
this.logsToStderr = logsToStderr;
}
private log(level: string, message: string, data: unknown = undefined) {
let dataOutput = undefined;
if (data) {
if (data instanceof Error) {
dataOutput = {
error: data.stack || data.message || String(data),
};
} else if (isObject(data)) {
dataOutput = JSON.stringify(data);
} else {
dataOutput = String(data);
}
}
const logEntry = {
time: new Date().toISOString(),
level_name: level,
message: `${this.name ? `[${this.name}] ` : ""}${message}`,
data: dataOutput,
};
const logString = JSON.stringify(logEntry);
if (this.logsToStderr || level === "ERROR") {
console.error(logString);
} else {
console.log(logString);
}
}
error(message: string, error: Error | undefined = undefined) {
this.log("error", message, error);
}
warn(message: string, data: unknown = undefined) {
this.log("warn", message, data);
}
info(message: string, data: unknown = undefined) {
this.log("info", message, data);
}
}
export default DefaultLogger;
export type { Logger };
