import type { Chunk, DataType, Scalar, TypedArray } from "../metadata.js";
export type Indices = [start: number, stop: number, step: number];
export interface Slice {
    start: number | null;
    stop: number | null;
    step: number | null;
}
export type Projection = {
    from: null;
    to: number;
} | {
    from: number;
    to: null;
} | {
    from: Indices;
    to: Indices;
};
export type Prepare<D extends DataType, NdArray extends Chunk<D>> = (data: TypedArray<D>, shape: number[], stride: number[]) => NdArray;
export type SetScalar<D extends DataType, NdArray extends Chunk<D>> = (target: NdArray, selection: (Indices | number)[], value: Scalar<D>) => void;
export type SetFromChunk<D extends DataType, NdArray extends Chunk<D>> = (a: NdArray, b: NdArray, proj: Projection[]) => void;
export type Setter<D extends DataType, Arr extends Chunk<D>> = {
    prepare: Prepare<D, Arr>;
    set_from_chunk: SetFromChunk<D, Arr>;
    set_scalar: SetScalar<D, Arr>;
};
export type Options = {
    create_queue?: () => ChunkQueue;
};
export type GetOptions<O> = Options & {
    opts?: O;
};
export type SetOptions = Options;
export type ChunkQueue = {
    add(fn: () => Promise<void>): void;
    onIdle(): Promise<Array<void>>;
};