Function createInstanceofPredicate

packages/mobx/src/utils/utils.ts:132–141

(
    name: string,
    theClass: new (...args: any[]) => T
)

}

export function createInstanceofPredicate<T>(
    name: string,
    theClass: new (...args: any[]) => T
): (x: any) => x is T {
    const propName = "isMobX" + name
    theClass.prototype[propName] = true
    return function (x) {
        return isObject(x) && x[propName] === true
    } as any
}

/**
 * Yields true for both native and observable Map, even across different windows.