Revised batchTasks generator

batchTasks-spread.js

export async function* batchTasks(tasks = [], limit = 5, taskCallback = r => r) {
  for (let i = 0; i < tasks.length; i = i + limit) {
    const batch = tasks.slice(i, i + limit)
    yield* await Promise.all(
      batch.map((task) => task().then(taskCallback))
    )
  }
}