import { EventEmitter } from 'node:events';
import type { Writable } from 'node:stream';
import type { InspectOptions } from 'node:util';
import type { LogLevel } from './levels';
/** Options for our {@link Logger} instances */
export interface LogOptions {
    /** The current output. */
    output: Writable;
    /** The current level for logging. */
    level: LogLevel;
    /** Whether to log in colors or not. */
    colors: boolean;
    /** The format of the log to use: `plain` or `fancy`. */
    format: 'plain' | 'fancy';
    /** Whether to enable the tasks spinner or not. */
    spinner: boolean;
    /** Width of the current terminal (if any) or `80`. */
    lineLength: number;
    /** The maximum length of a task name (for pretty alignment). */
    taskLength: number;
    /** The number of spaces used for indenting. */
    indentSize: number;
    /** Whether to show sources in reports or not. */
    showSources: boolean;
    /** Whether GitHub annotations are enabled or not. */
    githubAnnotations: boolean;
    /** The options used by NodeJS for object inspection. */
    readonly inspectOptions: InspectOptions;
    /** Add an event listener for the specified event. */
    on(eventName: 'changed', listener: (logOptions: this) => void): this;
    /** Add an event listener for the specified event triggering only once. */
    once(eventName: 'changed', listener: (logOptions: this) => void): this;
    /** Remove an event listener for the specified event. */
    off(eventName: 'changed', listener: (logOptions: this) => void): this;
    /**
     * Return a record of environment variables for forking.
     *
     * @param taskName The default task name of the forked process
     */
    forkEnv(taskName?: string): Record<string, string>;
}
declare class LogOptionsImpl extends EventEmitter implements LogOptions {
    private _output;
    private _level;
    private _colors;
    private _format;
    private _colorsSet;
    private _spinner;
    private _lineLength;
    private _lineLengthSet;
    private _showSources;
    private _githubAnnotations;
    private _inspectOptions;
    private _taskLength;
    private _indentSize;
    constructor();
    private _notifyListeners;
    forkEnv(taskName?: string): Record<string, string>;
    get output(): Writable;
    set output(output: Writable);
    get level(): LogLevel;
    set level(level: LogLevel);
    get colors(): boolean;
    set colors(color: boolean);
    get format(): 'plain' | 'fancy';
    set format(format: 'plain' | 'fancy');
    get spinner(): boolean;
    set spinner(spinner: boolean);
    get lineLength(): number;
    set lineLength(lineLength: number);
    get taskLength(): number;
    set taskLength(taskLength: number);
    get indentSize(): number;
    set indentSize(indentSize: number);
    get showSources(): boolean;
    set showSources(showSources: boolean);
    get githubAnnotations(): boolean;
    set githubAnnotations(githubAnnotations: boolean);
    get inspectOptions(): InspectOptions;
}
/** Shared instance of our {@link LogOptions}. */
export declare const logOptions: LogOptionsImpl;
export {};