Tone.js/Tone/core/util/Debug.ts

/**
 * Assert that the statement is true, otherwise invoke an error with the given message.
 */
export function assert(statement: boolean, error: string): void {
	if (!statement) {
		throw new Error(error);
	}
}

/**
 * Make sure that the given value is within the range
 */
export function assertRange(value: number, gte: number, lte: number = Infinity): void {
	if (!(gte <= value && value <= lte)) {
		throw new RangeError(`Value must be within [${gte}, ${lte}], got: ${value}`);
	}
}

/**
 * A basic logging interface
 */
interface Logger {
	log: (args?: any[]) => void;
	warn: (args?: any[]) => void;
}

/**
 * The default logger is the console
 */
let defaultLogger: Logger = console;

/**
 * Set the logging interface
 */
export function setLogger(logger: Logger): void {
	defaultLogger = logger;
}

/**
 * Log anything
 */
export function log(...args: any[]): void {
	defaultLogger.log(...args);
}

/**
 * Warn anything
 */
export function warn(...args: any[]): void {
	defaultLogger.warn(...args);
}