Generates friendly trace info for pipe() / compose()

trace.js

// Use like: trace("Friendly name", pipe)(map(...), filter(...), etc(...))

export const trace = (name, comp) => (...fns) => comp(...fns.map((fn, i) => {
  return (...args) => {
    try { return fn(...args); } catch(e) {
      e.message = `Error in ${comp.name}() sequence ${name} at step ${i} (${fn.name || '<anon>'}()): ${e.message}`;
      throw e;
    }
  };
}));