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denoland-deno/cli/js/web/util.ts
crowlKats e435c2be15
Remove doc strings from cli/js TS files (#4329)
Co-authored-by: Ryan Dahl <ry@tinyclouds.org>
2020-03-13 10:22:22 +01:00

55 lines
1.4 KiB
TypeScript

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
export type TypedArray = Uint8Array | Float32Array | Int32Array;
const TypedArrayConstructor = Object.getPrototypeOf(Uint8Array);
export function isTypedArray(x: unknown): x is TypedArray {
return x instanceof TypedArrayConstructor;
}
// @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);
}