Function createBuildOptions

helpers/compile/build.ts:70–78

* Create two deferred builds for esm and cjs. The one follows the other: * - 1. The code gets compiled to an optimized tree-shaken esm output * - 2. We take that output and compile it to an optimized cjs output * @param options the original build options * @returns if options = [a, b], we get [a

(options: BuildOptions[])

 * @returns if options = [a, b], we get [a-esm, a-cjs, b-esm, b-cjs]
 */
function createBuildOptions(options: BuildOptions[]) {
  return flatten(
    map(options, (options) => [
      // we defer it so that we don't trigger glob immediately
      () => applyDefaults(options),
      // ... here can go more steps
    ]),
  )
}

/**
 * We only want to trigger the glob search once we are ready, and that is when