comp-undo-steps 1: An example process.

comp-undo-steps-1-proc-example.js

const processFoo =
  stepA(optionsA)(
    stepB(optionsB)(
      stepC(optionsC)(
        // A SACRIFICE TO THE PYRAMID OF DOOM
        // On a more serious note, since each step function requires
        // a next function, we need to pass in a "return" function which
        // doesn't expect a next function to complete the chain.
        // If we didn't do this, stepC would return a function expecting a next
        // function... passing that function an object doesn't cause an error,
        // but it also doesn't result in stepC even running.
        res => res
      )
    )
  );

async function handleSomeThing(ctx) {
  const resultPctx = await processFoo(ctx);
  return resultPctx.resultFoo;
}