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type TypedArray =
| Int8Array
| Uint8Array
| Uint8ClampedArray
| Int16Array
| Uint16Array
| Int32Array
| Uint32Array
| Float32Array
| Float64Array
| BigInt64Array
| BigUint64Array
export const at = {
at<T extends Array<any> | string | TypedArray>(this: T, index: number) {
index = Math.trunc(index) || 0
if (index < 0) index += this.length
if (index < 0 || index >= this.length) return undefined
return this[index]
},
}.at
export const initRelativeIndexingMethod = (
target: any,
exclude: Set<string>
) => {
if (exclude.has('at')) return
const Classes = []
if (!exclude.has('TypedArray'))
Classes.push(
Object.getPrototypeOf(target.Int8Array || globalThis.Int8Array)
)
if (!exclude.has('Array')) Classes.push(target.Array || globalThis.Array)
if (!exclude.has('String')) Classes.push(target.String || globalThis.String)
for (const Class of Classes) {
if (!Class.prototype.at)
Object.defineProperty(Class.prototype, 'at', {
value: at,
writable: true,
enumerable: false,
configurable: true,
})
}
}
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