1 files changed, 74 insertions, 0 deletions
diff --git a/node_modules/vue/src/core/instance/inject.js b/node_modules/vue/src/core/instance/inject.js
new file mode 100644
index 00000000..e464e12a
--- /dev/null
+++ b/node_modules/vue/src/core/instance/inject.js
@@ -0,0 +1,74 @@
+/* @flow */
+
+import { hasOwn } from 'shared/util'
+import { warn, hasSymbol } from '../util/index'
+import { defineReactive, toggleObserving } from '../observer/index'
+
+export function initProvide (vm: Component) {
+  const provide = vm.$options.provide
+  if (provide) {
+    vm._provided = typeof provide === 'function'
+      ? provide.call(vm)
+      : provide
+  }
+}
+
+export function initInjections (vm: Component) {
+  const result = resolveInject(vm.$options.inject, vm)
+  if (result) {
+    toggleObserving(false)
+    Object.keys(result).forEach(key => {
+      /* istanbul ignore else */
+      if (process.env.NODE_ENV !== 'production') {
+        defineReactive(vm, key, result[key], () => {
+          warn(
+            `Avoid mutating an injected value directly since the changes will be ` +
+            `overwritten whenever the provided component re-renders. ` +
+            `injection being mutated: "${key}"`,
+            vm
+          )
+        })
+      } else {
+        defineReactive(vm, key, result[key])
+      }
+    })
+    toggleObserving(true)
+  }
+}
+
+export function resolveInject (inject: any, vm: Component): ?Object {
+  if (inject) {
+    // inject is :any because flow is not smart enough to figure out cached
+    const result = Object.create(null)
+    const keys = hasSymbol
+      ? Reflect.ownKeys(inject).filter(key => {
+        /* istanbul ignore next */
+        return Object.getOwnPropertyDescriptor(inject, key).enumerable
+      })
+      : Object.keys(inject)
+
+    for (let i = 0; i < keys.length; i++) {
+      const key = keys[i]
+      const provideKey = inject[key].from
+      let source = vm
+      while (source) {
+        if (source._provided && hasOwn(source._provided, provideKey)) {
+          result[key] = source._provided[provideKey]
+          break
+        }
+        source = source.$parent
+      }
+      if (!source) {
+        if ('default' in inject[key]) {
+          const provideDefault = inject[key].default
+          result[key] = typeof provideDefault === 'function'
+            ? provideDefault.call(vm)
+            : provideDefault
+        } else if (process.env.NODE_ENV !== 'production') {
+          warn(`Injection "${key}" not found`, vm)
+        }
+      }
+    }
+    return result
+  }
+}