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handling case where window is not defined

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either because it's loaded in node.js or because of the context that the script is loaded in
This commit is contained in:
Yotam Mann 2019-07-25 18:28:17 -04:00
parent cd73792659
commit 7a099b2310
2 changed files with 39 additions and 14 deletions
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21
Tone/core/Global.ts
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@ -1,20 +1,26 @@
import { version } from "../version";
import { hasAudioContext, theWindow } from "./context/AudioContext";
import { Context } from "./context/Context";
/**
* This dummy context is used to avoid throwing immediate errors when importing in Node.js
*/
const dummyContext: Context = {
destination: {},
transport: {},
} as Context;
/**
* The global audio context which is getable and assignable through
* getContext and setContext
*/
let globalContext: Context;
// @ts-ignore
globalContext = window.TONE_CONTEXT;
let globalContext: Context = dummyContext;
/**
* Returns the default system-wide AudioContext
*/
export function getContext(): Context {
if (!globalContext) {
if (!globalContext && hasAudioContext) {
setContext(new Context());
}
return globalContext;
@ -26,8 +32,6 @@ export function getContext(): Context {
export function setContext(context: Context): void {
globalContext = context;
context.initialize();
// @ts-ignore
window.TONE_CONTEXT = context;
}
/**
@ -46,9 +50,8 @@ export function start(): Promise <void> {
/**
* Log Tone.js + version in the console.
*/
if (!this.TONE_SILENCE_LOGGING) {
if (theWindow && !theWindow.TONE_SILENCE_LOGGING) {
let prefix = "v";
// @ts-ignore
if (version === "dev") {
prefix = "";
}

32
Tone/core/context/AudioContext.ts
View file

@ -1,17 +1,38 @@
/**
* Interface for things that Tone.js adds to the window
*/
interface ToneWindow extends Window {
TONE_AUDIO_CONTEXT?: BaseAudioContext;
TONE_SILENCE_LOGGING?: boolean;
}
/**
* A reference to the window object
*/
export const theWindow: ToneWindow | null = typeof self === "object" ? self : null;
/**
* If the browser has a window object which has an AudioContext
*/
export const hasAudioContext = theWindow && theWindow.hasOwnProperty("AudioContext");
/**
* The global audio context which is getable and assignable through
* getAudioContext and setAudioContext
*/
let globalContext: BaseAudioContext;
// @ts-ignore
globalContext = window.TONE_AUDIO_CONTEXT;
// if it was created already, use that one
// this enables multiple versions of Tone.js to run on the same page.
if (theWindow && theWindow.TONE_AUDIO_CONTEXT) {
globalContext = theWindow.TONE_AUDIO_CONTEXT;
}
/**
* Returns the default system-wide AudioContext
*/
export function getAudioContext(): BaseAudioContext {
if (!globalContext) {
if (!globalContext && hasAudioContext) {
setAudioContext(new AudioContext());
}
return globalContext;
@ -22,6 +43,7 @@ export function getAudioContext(): BaseAudioContext {
*/
export function setAudioContext(context: BaseAudioContext): void {
globalContext = context;
// @ts-ignore
window.TONE_AUDIO_CONTEXT = globalContext;
if (theWindow) {
theWindow.TONE_AUDIO_CONTEXT = globalContext;
}
}