Function composeFunctions

packages/challenge-builder/src/build.ts:54–55

(...fns: ApplyFunctionProps[])

  };

const composeFunctions = (...fns: ApplyFunctionProps[]) =>
  fns.map(applyFunction).reduce((f, g) => x => f(x).then(g));

// Test helpers parse sources.contents across all files. Without this boundary,
// an index.ts first-line declaration can be concatenated onto empty/no-newline