trusktr-dummy-test-pkg/instanceOf.js

JavaScript/TypeScript class inheritance tools.

// helper function to use instead of instanceof for classes that implement the
// static Symbol.hasInstance method, because the behavior of instanceof isn't
// polyfillable.
export default function instanceOf(instance, Constructor) {
    if (typeof Constructor == 'function' && Constructor[Symbol.hasInstance])
        return Constructor[Symbol.hasInstance](instance);
    else
        return instance instanceof Constructor;
}
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