logger.ts•1.67 kB
/**
* Copyright 2024 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import * as clc from 'colorette';
import * as winston from 'winston';
const defaultTransport = new winston.transports.Console();
export function forceStderr() {
logger.remove(defaultTransport);
logger.add(
// log to stderr to avoid
new winston.transports.Stream({
stream: process.stderr,
})
);
}
export const logger = winston.createLogger({
level: process.env.DEBUG ? 'debug' : 'info',
format: winston.format.printf((log) => {
// Anything logged at 'info' level will show as just the plain message
if (log.level === 'info') return log.message as string;
let levelColor: clc.Color;
switch (log.level) {
case 'error':
levelColor = clc.red;
break;
case 'warn':
levelColor = clc.yellow;
break;
default:
// Default is nothing.
levelColor = (text) => text.toString();
break;
}
const level = log.level.charAt(0).toUpperCase() + log.level.slice(1);
return `${clc.bold(levelColor(level))}: ${log.message}`;
}),
transports: [defaultTransport],
});