add file

node_modules/hable/src/utils.js

@@ -0,0 +1,16 @@
+export function flatHooks (configHooks, hooks = {}, parentName) {
+  for (const key in configHooks) {
+    const subHook = configHooks[key]
+    const name = parentName ? `${parentName}:${key}` : key
+    if (typeof subHook === 'object' && subHook !== null) {
+      flatHooks(subHook, hooks, name)
+    } else {
+      hooks[name] = subHook
+    }
+  }
+  return hooks
+}
+
+export function serial (tasks, fn) {
+  return tasks.reduce((promise, task) => promise.then(previous => fn(task, previous)), Promise.resolve(null))
+}