@pexip/signal/dist/baseLogger.d.ts

an observer pattern while avoiding boilerplate code. https://en.wikipedia.org/wiki/Signals_and_slots

/**
 * Log meta and message with respective log level
 */
export type LogMethod = (meta: unknown, message?: string) => void;
export declare enum LogLevels {
    trace = 10,
    debug = 20,
    info = 30,
    warn = 40,
    error = 50,
    fatal = 60,
    silent = 9007199254740991
}
export type LogLevelsString = keyof typeof LogLevels;
export type LogMethods = {
    [key in LogLevelsString]: LogMethod;
};
/**
 * Log Level from high to low, "fatal" | "error" | "warn" | "info" | "debug" | "trace"
 * Typically, debug and trace logs are only valid for development, and not needed in production
 */
export interface Logger extends LogMethods {
    /**
     * Add a pattern to the redactor and an optional mask for the redaction.
     *
     * @see {@link Redactor}
     *
     * @param value - The pattern to add.
     * @param replaceTo - The mask to use for redaction.
     */
    addRedactPattern(value: string, redactTo?: string): void;
    /**
     * Redact the provided string by replacing all occurrences of the patterns
     * and return a new string with redacted values.
     *
     * @see {@link Redactor}
     *
     * @param text - The string to redact.
     */
    redact(text: string): string;
}
/**
 * Create a logger with console API, and map fatal to error, skipping trace
 * and silent, and there is no redaction
 */
export declare function createConsoleLogger(): Readonly<Logger>;