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Tone.js/test/helper/Dispose.ts

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export function isDisposed(instance): void {
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for (const prop in instance) {
if (instance.hasOwnProperty(prop)) {
const member = instance[prop];
if (typeof member !== "function" &&
typeof member !== "string" &&
typeof member !== "number" &&
typeof member !== "boolean" &&
typeof member !== "undefined" &&
prop !== "preset" &&
!(member instanceof AudioContext)) {
if (member !== null) {
throw Error("property was not completely disposed: " + prop);
}
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}
}
}
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}