/** A contiguous segment of items sharing the same group key. */
export type Segment<A> = Readonly<{
    key: string;
    items: ReadonlyArray<A>;
}>;
/** Groups items into contiguous segments by a key function. Adjacent items with the same key are collected into a single segment. */
export declare const groupContiguous: <A>(items: ReadonlyArray<A>, toKey: (item: A, index: number) => string) => ReadonlyArray<Segment<A>>;
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