Tone.js/Tone/core/context/AudioContext.ts

import {
	AudioContext as stdAudioContext,
	AudioWorkletNode as stdAudioWorkletNode,
	OfflineAudioContext as stdOfflineAudioContext
} from "standardized-audio-context";
import { assert } from "../util/Debug";
import { isDefined } from "../util/TypeCheck";

/**
 * Create a new AudioContext
 */
export function createAudioContext(): AudioContext {
	return new stdAudioContext() as unknown as AudioContext;
}

/**
 * Create a new OfflineAudioContext
 */
export function createOfflineAudioContext(channels: number, length: number, sampleRate: number): OfflineAudioContext {
	return new stdOfflineAudioContext(channels, length, sampleRate) as unknown as OfflineAudioContext;
}

/**
 * Either the online or offline audio context
 */
export type AnyAudioContext = AudioContext | OfflineAudioContext;

/**
 * Interface for things that Tone.js adds to the window
 */
interface ToneWindow extends Window {
	TONE_SILENCE_LOGGING?: boolean;
	TONE_DEBUG_CLASS?: string;
}

/**
 * A reference to the window object
 * @hidden
 */
export const theWindow: ToneWindow | null = typeof self === "object" ? self : null;

/**
 * If the browser has a window object which has an AudioContext
 * @hidden
 */
export const hasAudioContext = theWindow &&
	(theWindow.hasOwnProperty("AudioContext") || theWindow.hasOwnProperty("webkitAudioContext"));

export function createAudioWorkletNode(context: AnyAudioContext, name: string, options?: Partial<AudioWorkletNodeOptions>): AudioWorkletNode {
	assert(isDefined(stdAudioWorkletNode), "This node only works in a secure context (https or localhost)");
	// @ts-ignore
	return new stdAudioWorkletNode(context, name, options);
}

/**
 * This promise resolves to a boolean which indicates if the 
 * functionality is supported within the currently used browse. 
 * Taken from [standardized-audio-context](https://github.com/chrisguttandin/standardized-audio-context#issupported)
 */
export { isSupported as supported } from "standardized-audio-context";