import { Milliseconds } from '@epdoc/timeutil';
export type Microseconds = number;
/**
 * Represents the elapsed time since the start of the program with total and
 * delta properties, where delta is the time since the last call to elapsedTime.
 */
export type AppTimerValues = {
    total: Milliseconds;
    interval: Milliseconds;
};
export type AppTimerStrings = {
    total: string;
    interval: string;
};
/**
 * Measures elapsed time with total and interval properties. Measures in
 * microseconds.
 */
export declare class AppTimer {
    protected _startTime: Microseconds;
    protected _lastMeasurement: Microseconds;
    constructor();
    protected now(): Microseconds;
    /**
     * Resets both the start time and last measurement to the current time.
     * @returns {this} The current instance for method chaining.
     */
    resetAll(): this;
    /**
     * Resets only the last measurement to the current time.
     * @returns {this} The current instance for method chaining.
     */
    resetInterval(): this;
    /**
     * Measures the elapsed time since the start and last measurement.
     * @returns {AppTimerValues} An object containing total and interval elapsed times in milliseconds.
     */
    measure(): AppTimerValues;
    /**
     * Measures the elapsed time and returns it as formatted strings.
     * @returns {AppTimerStrings} An object containing formatted total and interval elapsed times.
     */
    measureFormatted(): AppTimerStrings;
}
/**
 * Measures elapsed time with total and interval properties. Measures in
 * microseconds. Initialized at construction.
 */
export declare const appTimer: AppTimer;