shelving/util/class.js

Toolkit for using data in JavaScript.

import { RequiredError } from "../error/RequiredError.js";
/** Is a given value a class constructor? */
export function isConstructor(value) {
    return typeof value === "function" && value.toString().startsWith("class");
}
/** Is a value an instance of a class? */
export function isInstance(value, type) {
    return value instanceof type;
}
/** Assert that a value is an instance of something. */
export function assertInstance(value, type) {
    if (!(value instanceof type))
        throw new RequiredError(`Must be instance of class "${type.name}"`, { received: value, expected: type, caller: assertInstance });
}
/** Get the 'getter' function for a given property, or `undefined` if it doesn't exist. */
// biome-ignore lint/complexity/noBannedTypes: This is correct here.
export function getGetter(obj, prop) {
    const descriptor = Object.getOwnPropertyDescriptor(obj, prop);
    return descriptor && typeof descriptor.get === "function" ? descriptor.get : undefined;
}
/** Get the 'setter' function for a given property, or `undefined` if it doesn't exist. */
// biome-ignore lint/complexity/noBannedTypes: This is correct here.
export function getSetter(obj, prop) {
    const descriptor = Object.getOwnPropertyDescriptor(obj.constructor.prototype, prop);
    return descriptor && typeof descriptor.set === "function" ? descriptor.set : undefined;
}