lazy-widgets/dist/xml/makeInstanceOfValidator.js

Typescript retained mode GUI for the HTML canvas API

/**
 * Creates a new validator function which checks whether an input value is an
 * instance of a given class. Doesn't stop the validator chain.
 *
 * @category XML
 */
export function makeInstanceOfValidator(clazz) {
    return (value) => {
        if (value instanceof clazz) {
            return [value, false];
        }
        else {
            throw new Error('Invalid instance; not an instance of the wanted class');
        }
    };
}
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