@beenotung/tslib/log.js

utils library in Typescript

"use strict";
/**
 * for Node.js
 * */
Object.defineProperty(exports, "__esModule", { value: true });
exports.genLogFilename = genLogFilename;
exports.wrapConsoleLog = wrapConsoleLog;
function to2Dig(n) {
    if (n < 10) {
        return '0' + n;
    }
    return n.toString();
}
function genLogFilename(name = 'log', ext = 'txt') {
    const d = new Date();
    const dateText = [
        d.getFullYear(),
        to2Dig(d.getMonth() + 1),
        to2Dig(d.getDate()),
        '-',
        to2Dig(d.getHours()),
        to2Dig(d.getMinutes()),
        to2Dig(d.getSeconds()),
    ].join('');
    return [name, dateText, ext].join('.');
}
function formatLog(args) {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const util = require('util');
    return util.format.apply(null, args);
}
function wrapConsoleLog(filename = genLogFilename()) {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const fs = require('fs');
    // Or 'w' to truncate the file every time the process starts.
    const logFile = fs.createWriteStream(filename, { flags: 'a' });
    // eslint-disable-next-line no-console
    console.log = function () {
        const text = formatLog(arguments) + '\n';
        logFile.write(text);
        process.stdout.write(text);
    };
    console.error = function () {
        const text = formatLog(arguments) + '\n';
        logFile.write(text);
        process.stderr.write(text);
    };
}