@build-connect/utils/log.js

utils for build connect

const fs = require('fs');
const path = require('path');

function getCallerInfo() {
    const originalFunc = Error.prepareStackTrace;
    Error.prepareStackTrace = (_, stack) => stack;

    const err = new Error();
    const { stack } = err;

    Error.prepareStackTrace = originalFunc;

    const caller = stack[2]; // 0 = getCallerInfo, 1 = log, 2 = caller of log()
    const fileName = path.basename(caller.getFileName());
    const lineNumber = caller.getLineNumber();

    return `${fileName}:${lineNumber}`;
}

function log(level, message, meta = {}) {
    const location = getCallerInfo();

    const logLine = `${JSON.stringify({
        level,
        time: new Date().toISOString(),
        location,
        message,
        ...meta,
    })}\n`;

    fs.appendFileSync('app.log', logLine);
}

module.exports = log;