type-plus/esm/class/isConstructor.js

Provides additional types for TypeScript.

/**
 * Is the subject a constructor function.
 *
 * @deprecated this is not a failsafe test,
 * it will return true for any function that can be called with `new`.
 *
 * If the subject is an arrow function,
 * it can still return true after compilation.
 *
 * Thus this function is not safe to use.
 */
export function isConstructor(subject) {
    try {
        new subject();
    }
    catch (err) {
        const msg = err?.message;
        if (msg && msg.indexOf('is not a constructor') >= 0) {
            return false;
        }
    }
    return true;
}
/**
 * instanceof type guard for unknown value.
 */
export function isInstanceof(subject, constructor) {
    return subject instanceof constructor;
}
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