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38 lines
999 B
38 lines
999 B
4 years ago
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"use strict";
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const LEVELS = ['debug', 'info', 'warn', 'error', 'silent'];
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const LEVEL_TO_CONSOLE_METHOD = new Map([['debug', 'log'], ['info', 'log'], ['warn', 'log']]);
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class Logger {
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constructor(level = Logger.defaultLevel) {
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this.activeLevels = new Set();
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this.setLogLevel(level);
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}
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setLogLevel(level) {
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const levelIndex = LEVELS.indexOf(level);
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if (levelIndex === -1) throw new Error(`Invalid log level "${level}". Use one of these: ${LEVELS.join(', ')}`);
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this.activeLevels.clear();
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for (const [i, level] of LEVELS.entries()) {
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if (i >= levelIndex) this.activeLevels.add(level);
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}
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}
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_log(level, ...args) {
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console[LEVEL_TO_CONSOLE_METHOD.get(level) || level](...args);
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}
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}
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Logger.levels = LEVELS;
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Logger.defaultLevel = 'info';
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;
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LEVELS.forEach(level => {
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if (level === 'silent') return;
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Logger.prototype[level] = function (...args) {
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if (this.activeLevels.has(level)) this._log(level, ...args);
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};
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});
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module.exports = Logger;
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