first i use fill function
const range = new Array(layernum.length).fill(NaN);//[ts] Property 'fill' does not exist on type 'any[]'
to deal with this problem,i use
const range = new Int32Array(layernum.length).fill(NaN);
instead
while,it cause another problem
let layer = range.map(e => range.map(e => e)); //Type 'Int32Array' is not assignable to type 'number'
so how to use prototype in Typescript
The fill method of array exists only in ES6 or above. In order for typescript to recognize the propper ES6 version of the Array class you need to make sure you include es6 in the lib property of your tsconfig.json. For example:
{
"compilerOptions": {
"target": "es5",
"lib" : ["es6", "dom"]
}
}
If you don't want/can't use the lib.es6.d.ts, then you can update the compiler with the method signature:
declare global {
interface Array<T> {
fill(value: T, start?: number, end?: number): this;
}
}
