如何扩展AudioNode（没有构造函数的本地对象）

Question

I'm trying to put this code to use (a tone.js piano, not written by me).

The piano class extends AudioNode like so:

class Piano extends AudioNode {

    constructor(){

        super()
        // piano specific stuff...
    }
}

When I try to instantiate it, following the documentation, with

const piano = new Piano()

I get "TypeError: Illegal constructor".

What is then the correct way to extend a native object such as AudioNode that can't be instantiated with new ? Did something change in the recent past so that the above code no longer works?

Answer 1

The AudioNode in the example you are referring to is taken from the tone.js library. Take a look at the import statement:

import Tone, { Gain, Frequency, AudioNode, Buffer} from 'tone'

The error you get is a sign that you did not import the AudioNode from the library. That's why your code is using the native AudioNode type that cannot be extended.