prepareAsyncPipe

prepareAsyncPipe() is the asynchronous counterpart of preparePipe(). It declares up to fifteen transformations once, accepts synchronous or promise-returning steps, and returns a reusable asynchronous function.

The prepared function accepts either a direct input or a promise. Its contextual input-to-output signature can drive the local input inference, including when the pipeline participates in a recursive asynchronous function.

Interactive example

Syntax

Explicit input type

const prepared = prepareAsyncPipe<Input>()(
  pipe1,
  pipe2
);

Contextual input-to-output type

const prepared: (input: Input) => Promise<Output> = prepareAsyncPipe()(
  pipe1,
  pipe2
);

Parameters

• Input: optional upper constraint for the direct or promised input.
• pipe1, pipe2, ...: one to fifteen transformations returning either a value or a promise.

Return value

A reusable function accepting Input | PromiseLike<Input> and returning a promise of the final output.

See also

• preparePipe - Synchronous prepared variant.
• asyncInnerPipe - Reusable asynchronous composition inferred directly from its steps.