declare module '@ember/-internals/utility-types' {
    export type AnyFn = (...args: any[]) => any;
    export type MethodsOf<T> = {
        [K in keyof T as T[K] extends AnyFn ? K : never]: T[K] extends AnyFn ? T[K] : never;
    };
    export type MethodNamesOf<T> = keyof MethodsOf<T>;
    export type MethodParams<T, M extends MethodNamesOf<T>> = Parameters<MethodsOf<T>[M]>;
    export type MethodReturns<T, M extends MethodNamesOf<T>> = ReturnType<MethodsOf<T>[M]>;
    export type OmitFirst<F> = F extends [any, ...infer R] ? R : [];
    const Data: unique symbol;
    export class Opaque<Data> {
        private [Data];
    }
    export type Nullable<T> = T | null;
    export {};
}