swc_ecma_transforms_base 41.0.1

rust port of babel and closure compiler.
Documentation 
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function _define_property(obj, key, value) {
    if (key in obj) {
        Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true });
    } else {
        obj[key] = value;
    }
    return obj;
}