lazy-widgets/dist/xml/validateKeyContext.js

Typescript retained mode GUI for the HTML canvas API

/**
 * A validator function which checks whether an input value is a
 * {@link KeyContext}. Doesn't stop the validator chain.
 *
 * @category XML
 */
export function validateKeyContext(value) {
    if (typeof value !== 'object') {
        throw new Error('Invalid KeyContext; not an object');
    }
    if (value === null) {
        throw new Error('Invalid KeyContext; null');
    }
    const kc = value;
    if (typeof kc.callback !== 'function') {
        throw new Error('Invalid KeyContext; callback is not a function');
    }
    if (typeof kc.shift !== 'boolean') {
        throw new Error('Invalid KeyContext; shift is not a boolean');
    }
    if (typeof kc.ctrl !== 'boolean') {
        throw new Error('Invalid KeyContext; ctrl is not a boolean');
    }
    if (typeof kc.alt !== 'boolean') {
        throw new Error('Invalid KeyContext; alt is not a boolean');
    }
    return [kc, false];
}
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