Create a way to describe computed schemas.

[iwoplaza]

An example use-case would be an image format, whose size is defined in the header, then the rest of the bytes are dedicated to the bitmap.

import bin from 'typed-binary';

const Size = bin.tupleOf([bin.u32, bin.u32]);

const Bitmap = (width, height) => bin.u8ClampedArray(width * height);

const Image = bin.pipe(
  // -- Header
  bin.object({ size: Size }),
  // -- Body
  ({ size }) =>
    bin.object({
      size: bin.inherent(size),
      bitmap: Bitmap(...size),
    }),
);