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logger.js
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logger.js
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const { createLogger, format, transports } = require("winston");
const logPrinter = format.printf(({ level, message, stack, file, timestamp }) => {
let msg = message;
if (message instanceof Error) {
msg = message.stack;
} else if (typeof message === "object") {
msg = JSON.stringify(message, null, 2);
}
const lvl = level === "error" ? "ERROR" : level;
return `${timestamp} [${file}] ${lvl}: ${msg}`;
});
const logger = createLogger({
level: "info",
format: format.combine(
format.timestamp({
format: "YYYY-MM-DD HH:mm:ss"
}),
logPrinter,
),
defaultMeta: { service: "alfred" },
});
if (process.stdin.isTTY) {
// Log to console if dev
logger.add(new transports.Console());
} else {
const prefix = `${__dirname}/../../logs/`;
logger.add(new transports.File({ filename: `${prefix}alfred-error.log`, level: "error" }));
logger.add(new transports.File({ filename: `${prefix}alfred-combined.log` }));
}
module.exports = (file) => ({
info: m => logger.info(m, { file }),
error: m => logger.error(m, { file }),
});