Move prepare method to alt

docs/prepare.md

@@ -0,0 +1,22 @@
+---
+layout: docs
+title: Prepare
+description: Prepare a payload for bootstrapping
+permalink: /docs/prepare/
+---
+
+# prepare
+
+> (Store: AltStore, payload: mixed): string
+
+Given a store and a payload this functions returns a serialized string you can use to bootstrap that particular store.
+
+```js
+const data = alt.prepare(TodoStore, {
+  todos: [{
+    text: 'Buy some milk'
+  ]}
+});
+
+alt.bootstrap(data);
+```

src/alt/AltStore.js

@@ -87,12 +87,6 @@ export default class AltStore {
     this[EE].removeListener('change', cb)
   }
 
-  prepare(state) {
-    const data = {}
-    data[this._storeName] = state
-    return this[ALT].serialize(data)
-  }
-
   getState() {
     return this[ALT].getState(this[STATE_CONTAINER])
   }

src/alt/index.js

@@ -185,6 +185,15 @@ class Alt {
     })
   }
 
+  prepare(store, payload) {
+    const data = {}
+    if (!store._storeName) {
+      throw new ReferenceError('Store provided does not have a name')
+    }
+    data[store._storeName] = payload
+    return this.serialize(data)
+  }
+
   // Instance type methods for injecting alt into your application as context
 
   addActions(name, ActionsClass, ...args) {

test/index.js

@@ -1338,6 +1338,21 @@ const tests = {
 
     actions.fire()
   },
+
+  'prepare a payload for bootstrap'() {
+    const serialized = alt.prepare(myStore, { a: 1, b: 2 })
+    const parsed = JSON.parse(serialized)
+
+    assert.isString(serialized)
+    assert.isObject(parsed.MyStore)
+    assert(parsed.MyStore.a === 1)
+    assert(parsed.MyStore.b === 2)
+    assert.isUndefined(parsed.MyStore.c)
+
+    assert.throws(() => {
+      alt.prepare({}, { x: 0 })
+    }, ReferenceError)
+  },
 }
 
 export default tests