sparky.js

// This works
Sparky.task("copy:assets", () => Sparky.watch("./assets/**/*", { base: homeDir }).dest("./dist"));
Sparky.task("copy:vendor", () => Sparky.watch("./vendor/**/*", { base: homeDir }).dest("./dist"));
Sparky.task("copy:index", () => Sparky.watch("./index.html", { base: homeDir }).dest("./dist"));
Sparky.task("copy", ["copy:assets", "copy:vendor", "copy:index"], () => {});

// But this doesn't
Sparky.task("copy", () => {
  return Promise.all([
    Sparky.watch("./assets/**/*", { base: homeDir }).dest("./dist"),
    Sparky.watch("./vendor/**/*", { base: homeDir }).dest("./dist"),
    Sparky.watch("./index.html", { base: homeDir }).dest("./dist")
  ]);
});