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/* @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: "${key}"`,
vm
)
})
} else {
defineReactive(vm, key, result[key])
}
})
toggleObserving(true)
}
}
export function resolveInject (inject: any, vm: Component): ?Object {
if (inject) {
// inject is :any because flow is not smart enough to figure out cached
const result = Object.create(null)
const keys = hasSymbol
? Reflect.ownKeys(inject)
: Object.keys(inject)
for (let i = 0; i < keys.length; i++) {
const key = keys[i]
// #6574 in case the inject object is observed...
if (key === '__ob__') continue
const provideKey = inject[key].from
let source = vm
while (source) {
if (source._provided && hasOwn(source._provided, provideKey)) {
result[key] = source._provided[provideKey]
break
}
source = source.$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
}
}