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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
export type TypedArray =
| Int8Array
| Uint8Array
| Uint8ClampedArray
| Int16Array
| Uint16Array
| Int32Array
| Uint32Array
| Float32Array
| Float64Array;
export function isTypedArray(x: unknown): x is TypedArray {
return (
x instanceof Int8Array ||
x instanceof Uint8Array ||
x instanceof Uint8ClampedArray ||
x instanceof Int16Array ||
x instanceof Uint16Array ||
x instanceof Int32Array ||
x instanceof Uint32Array ||
x instanceof Float32Array ||
x instanceof Float64Array
);
}
// @internal
export function requiredArguments(
name: string,
length: number,
required: number
): void {
if (length < required) {
const errMsg = `${name} requires at least ${required} argument${
required === 1 ? "" : "s"
}, but only ${length} present`;
throw new TypeError(errMsg);
}
}
// @internal
export function immutableDefine(
// eslint-disable-next-line @typescript-eslint/no-explicit-any
o: any,
p: string | number | symbol,
// eslint-disable-next-line @typescript-eslint/no-explicit-any
value: any
): void {
Object.defineProperty(o, p, {
value,
configurable: false,
writable: false,
});
}
// Returns values from a WeakMap to emulate private properties in JavaScript
export function getPrivateValue<
K extends object,
V extends object,
W extends keyof V
>(instance: K, weakMap: WeakMap<K, V>, key: W): V[W] {
if (weakMap.has(instance)) {
return weakMap.get(instance)![key];
}
throw new TypeError("Illegal invocation");
}
export function hasOwnProperty<T>(obj: T, v: PropertyKey): boolean {
if (obj == null) {
return false;
}
return Object.prototype.hasOwnProperty.call(obj, v);
}
/** Returns whether o is iterable.
*
* @internal */
export function isIterable<T, P extends keyof T, K extends T[P]>(
o: T
): o is T & Iterable<[P, K]> {
// checks for null and undefined
if (o == null) {
return false;
}
return (
typeof ((o as unknown) as Iterable<[P, K]>)[Symbol.iterator] === "function"
);
}
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