/**
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* An object whose all properties have the same type.
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*/
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export declare type Dictionary<T = any> = {
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[key: string]: T;
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};
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/**
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* Returns the keys of T that match Dictionary<U> and are not arrays.
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*/
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export declare type DictionaryKeyof<T, U = any> = Exclude<KeyOf<T, Dictionary<U>>, KeyOf<T, any[]>>;
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/**
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* Returns the keys of T that match U.
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*/
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export declare type KeyOf<T, U> = Exclude<{
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[K in keyof T]: T[K] extends U ? K : never;
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}[keyof T], undefined>;
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/**
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* An array whose first element is not undefined.
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*/
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export declare type NotEmptyArray<T = any> = [T, ...T[]];
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/**
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* Returns the type of a Dictionary or array values.
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*/
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export declare type ValueOf<T> = T extends (infer U)[] ? U : T[keyof T];
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/**
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* Typing wrapper around assert.notStrictEqual()
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*/
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export declare function assertNotStrictEqual<N, T>(actual: T | N, expected: N, message?: string | Error): asserts actual is Exclude<T, N>;
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/**
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* Asserts actual is a single key, not a key array or a key map.
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*/
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export declare function assertSingleKey(actual: string | string[] | Dictionary): asserts actual is string;
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/**
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* Typing wrapper around Object.keys()
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*/
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export declare function objectKeys<T>(object: T): (keyof T)[];
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