1 |
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2 |
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3 | import config from 'core/config'
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4 | import { warn, makeMap, isNative } from '../util/index'
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5 |
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6 | let initProxy
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7 |
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8 | if (process.env.NODE_ENV !== 'production') {
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9 | const allowedGlobals = makeMap(
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10 | 'Infinity,undefined,NaN,isFinite,isNaN,' +
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11 | 'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
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12 | 'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
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13 | 'require'
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14 | )
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15 |
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16 | const warnNonPresent = (target, key) => {
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17 | warn(
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18 | `Property or method "${key}" is not defined on the instance but ` +
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19 | 'referenced during render. Make sure that this property is reactive, ' +
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20 | 'either in the data option, or for class-based components, by ' +
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21 | 'initializing the property. ' +
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22 | 'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
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23 | target
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24 | )
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25 | }
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26 |
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27 | const warnReservedPrefix = (target, key) => {
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28 | warn(
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29 | `Property "${key}" must be accessed with "$data.${key}" because ` +
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30 | 'properties starting with "$" or "_" are not proxied in the Vue instance to ' +
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31 | 'prevent conflicts with Vue internals' +
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32 | 'See: https://vuejs.org/v2/api/#data',
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33 | target
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34 | )
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35 | }
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36 |
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37 | const hasProxy =
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38 | typeof Proxy !== 'undefined' && isNative(Proxy)
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39 |
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40 | if (hasProxy) {
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41 | const isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact')
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42 | config.keyCodes = new Proxy(config.keyCodes, {
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43 | set (target, key, value) {
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44 | if (isBuiltInModifier(key)) {
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45 | warn(`Avoid overwriting built-in modifier in config.keyCodes: .${key}`)
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46 | return false
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47 | } else {
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48 | target[key] = value
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49 | return true
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50 | }
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51 | }
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52 | })
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53 | }
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54 |
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55 | const hasHandler = {
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56 | has (target, key) {
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57 | const has = key in target
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58 | const isAllowed = allowedGlobals(key) ||
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59 | (typeof key === 'string' && key.charAt(0) === '_' && !(key in target.$data))
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60 | if (!has && !isAllowed) {
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61 | if (key in target.$data) warnReservedPrefix(target, key)
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62 | else warnNonPresent(target, key)
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63 | }
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64 | return has || !isAllowed
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65 | }
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66 | }
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67 |
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68 | const getHandler = {
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69 | get (target, key) {
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70 | if (typeof key === 'string' && !(key in target)) {
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71 | if (key in target.$data) warnReservedPrefix(target, key)
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72 | else warnNonPresent(target, key)
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73 | }
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74 | return target[key]
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75 | }
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76 | }
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77 |
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78 | initProxy = function initProxy (vm) {
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79 | if (hasProxy) {
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80 |
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81 | const options = vm.$options
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82 | const handlers = options.render && options.render._withStripped
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83 | ? getHandler
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84 | : hasHandler
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85 | vm._renderProxy = new Proxy(vm, handlers)
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86 | } else {
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87 | vm._renderProxy = vm
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88 | }
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89 | }
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90 | }
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91 |
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92 | export { initProxy }
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