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console_handler.ts
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console_handler.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { type LevelName, LogLevels } from "./levels.ts";
import type { LogRecord } from "./logger.ts";
import { blue, bold, red, yellow } from "../fmt/colors.ts";
import { BaseHandler, type BaseHandlerOptions } from "./base_handler.ts";
export interface ConsoleHandlerOptions extends BaseHandlerOptions {
useColors?: boolean;
}
/**
* This is the default logger. It will output color coded log messages to the
* console via `console.log()`.
*/
export class ConsoleHandler extends BaseHandler {
#useColors?: boolean;
constructor(levelName: LevelName, options: ConsoleHandlerOptions = {}) {
super(levelName, options);
this.#useColors = options.useColors ?? true;
}
override format(logRecord: LogRecord): string {
let msg = super.format(logRecord);
if (this.#useColors) {
msg = this.applyColors(msg, logRecord.level);
}
return msg;
}
applyColors(msg: string, level: number): string {
switch (level) {
case LogLevels.INFO:
msg = blue(msg);
break;
case LogLevels.WARN:
msg = yellow(msg);
break;
case LogLevels.ERROR:
msg = red(msg);
break;
case LogLevels.CRITICAL:
msg = bold(red(msg));
break;
default:
break;
}
return msg;
}
override log(msg: string) {
console.log(msg);
}
}