snowpack/lib/logger.js

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.logger = void 0;
const colors = __importStar(require("kleur/colors"));
const levels = {
    debug: 20,
    info: 30,
    warn: 40,
    error: 50,
    silent: 90,
};
/** Custom logger heavily-inspired by https://github.com/pinojs/pino with extra features like log retentian */
class SnowpackLogger {
    constructor() {
        /** set the log level (can be changed after init) */
        this.level = 'info';
        /** configure maximum number of logs to keep (default: 500) */
        this.logCount = 500;
        this.history = []; // this is immutable; must be accessed with Logger.getHistory()
        this.callbacks = {
            debug: (message) => {
                console.log(message);
            },
            info: (message) => {
                console.log(message);
            },
            warn: (message) => {
                console.warn(message);
            },
            error: (message) => {
                console.error(message);
            },
        };
    }
    log({ level, name, message, task, }) {
        // test if this level is enabled or not
        if (levels[this.level] > levels[level]) {
            return; // do nothing
        }
        // format
        let text = message;
        if (level === 'warn')
            text = colors.yellow(text);
        if (level === 'error')
            text = colors.red(text);
        const log = `${colors.dim(`[${name}]`)} ${text}`;
        // add to log history and remove old logs to keep memory low
        const lastHistoryItem = this.history[this.history.length - 1];
        if (lastHistoryItem && lastHistoryItem.val === log) {
            lastHistoryItem.count++;
        }
        else {
            this.history.push({ val: log, count: 1 });
        }
        while (this.history.length > this.logCount) {
            this.history.shift();
        }
        // log
        if (typeof this.callbacks[level] === 'function') {
            this.callbacks[level](log);
        }
        else {
            throw new Error(`No logging method defined for ${level}`);
        }
        // logger takes a possibly processor-intensive task, and only
        // processes it when this log level is enabled
        task && task(this);
    }
    /** emit messages only visible when --debug is passed */
    debug(message, options) {
        const name = (options && options.name) || 'snowpack';
        this.log({ level: 'debug', name, message, task: options === null || options === void 0 ? void 0 : options.task });
    }
    /** emit general info */
    info(message, options) {
        const name = (options && options.name) || 'snowpack';
        this.log({ level: 'info', name, message, task: options === null || options === void 0 ? void 0 : options.task });
    }
    /** emit non-fatal warnings */
    warn(message, options) {
        const name = (options && options.name) || 'snowpack';
        this.log({ level: 'warn', name, message, task: options === null || options === void 0 ? void 0 : options.task });
    }
    /** emit critical error messages */
    error(message, options) {
        const name = (options && options.name) || 'snowpack';
        this.log({ level: 'error', name, message, task: options === null || options === void 0 ? void 0 : options.task });
    }
    /** get full logging history */
    getHistory() {
        return this.history;
    }
    /** listen for events */
    on(event, callback) {
        this.callbacks[event] = callback;
    }
}
/** export one logger to rest of app */
exports.logger = new SnowpackLogger();