refactor(reactivity): improve tree-shaking annotations

packages/reactivity/src/baseHandlers.ts

@@ -42,37 +42,42 @@ const shallowGet = /*#__PURE__*/ createGetter(false, true)
 const readonlyGet = /*#__PURE__*/ createGetter(true)
 const shallowReadonlyGet = /*#__PURE__*/ createGetter(true, true)
 
-const arrayInstrumentations: Record<string, Function> = {}
-// instrument identity-sensitive Array methods to account for possible reactive
-// values
-;(['includes', 'indexOf', 'lastIndexOf'] as const).forEach(key => {
-  const method = Array.prototype[key] as any
-  arrayInstrumentations[key] = function(this: unknown[], ...args: unknown[]) {
-    const arr = toRaw(this)
-    for (let i = 0, l = this.length; i < l; i++) {
-      track(arr, TrackOpTypes.GET, i + '')
+const arrayInstrumentations = /*#__PURE__*/ createArrayInstrumentations()
+
+function createArrayInstrumentations() {
+  const instrumentations: Record<string, Function> = {}
+  // instrument identity-sensitive Array methods to account for possible reactive
+  // values
+  ;(['includes', 'indexOf', 'lastIndexOf'] as const).forEach(key => {
+    const method = Array.prototype[key] as any
+    instrumentations[key] = function(this: unknown[], ...args: unknown[]) {
+      const arr = toRaw(this)
+      for (let i = 0, l = this.length; i < l; i++) {
+        track(arr, TrackOpTypes.GET, i + '')
+      }
+      // we run the method using the original args first (which may be reactive)
+      const res = method.apply(arr, args)
+      if (res === -1 || res === false) {
+        // if that didn't work, run it again using raw values.
+        return method.apply(arr, args.map(toRaw))
+      } else {
+        return res
+      }
     }
-    // we run the method using the original args first (which may be reactive)
-    const res = method.apply(arr, args)
-    if (res === -1 || res === false) {
-      // if that didn't work, run it again using raw values.
-      return method.apply(arr, args.map(toRaw))
-    } else {
+  })
+  // instrument length-altering mutation methods to avoid length being tracked
+  // which leads to infinite loops in some cases (#2137)
+  ;(['push', 'pop', 'shift', 'unshift', 'splice'] as const).forEach(key => {
+    const method = Array.prototype[key] as any
+    instrumentations[key] = function(this: unknown[], ...args: unknown[]) {
+      pauseTracking()
+      const res = method.apply(this, args)
+      resetTracking()
       return res
     }
-  }
-})
-// instrument length-altering mutation methods to avoid length being tracked
-// which leads to infinite loops in some cases (#2137)
-;(['push', 'pop', 'shift', 'unshift', 'splice'] as const).forEach(key => {
-  const method = Array.prototype[key] as any
-  arrayInstrumentations[key] = function(this: unknown[], ...args: unknown[]) {
-    pauseTracking()
-    const res = method.apply(this, args)
-    resetTracking()
-    return res
-  }
-})
+  })
+  return instrumentations
+}
 
 function createGetter(isReadonly = false, shallow = false) {
   return function get(target: Target, key: string | symbol, receiver: object) {
@@ -224,7 +229,7 @@ export const readonlyHandlers: ProxyHandler<object> = {
   }
 }
 
-export const shallowReactiveHandlers: ProxyHandler<object> = extend(
+export const shallowReactiveHandlers = /*#__PURE__*/ extend(
   {},
   mutableHandlers,
   {
@@ -236,7 +241,7 @@ export const shallowReactiveHandlers: ProxyHandler<object> = extend(
 // Props handlers are special in the sense that it should not unwrap top-level
 // refs (in order to allow refs to be explicitly passed down), but should
 // retain the reactivity of the normal readonly object.
-export const shallowReadonlyHandlers: ProxyHandler<object> = extend(
+export const shallowReadonlyHandlers = /*#__PURE__*/ extend(
   {},
   readonlyHandlers,
   {

packages/reactivity/src/collectionHandlers.ts

@@ -236,93 +236,109 @@ function createReadonlyMethod(type: TriggerOpTypes): Function {
   }
 }
 
-const mutableInstrumentations: Record<string, Function> = {
-  get(this: MapTypes, key: unknown) {
-    return get(this, key)
-  },
-  get size() {
-    return size((this as unknown) as IterableCollections)
-  },
-  has,
-  add,
-  set,
-  delete: deleteEntry,
-  clear,
-  forEach: createForEach(false, false)
+function createInstrumentations() {
+  const mutableInstrumentations: Record<string, Function> = {
+    get(this: MapTypes, key: unknown) {
+      return get(this, key)
+    },
+    get size() {
+      return size((this as unknown) as IterableCollections)
+    },
+    has,
+    add,
+    set,
+    delete: deleteEntry,
+    clear,
+    forEach: createForEach(false, false)
+  }
+
+  const shallowInstrumentations: Record<string, Function> = {
+    get(this: MapTypes, key: unknown) {
+      return get(this, key, false, true)
+    },
+    get size() {
+      return size((this as unknown) as IterableCollections)
+    },
+    has,
+    add,
+    set,
+    delete: deleteEntry,
+    clear,
+    forEach: createForEach(false, true)
+  }
+
+  const readonlyInstrumentations: Record<string, Function> = {
+    get(this: MapTypes, key: unknown) {
+      return get(this, key, true)
+    },
+    get size() {
+      return size((this as unknown) as IterableCollections, true)
+    },
+    has(this: MapTypes, key: unknown) {
+      return has.call(this, key, true)
+    },
+    add: createReadonlyMethod(TriggerOpTypes.ADD),
+    set: createReadonlyMethod(TriggerOpTypes.SET),
+    delete: createReadonlyMethod(TriggerOpTypes.DELETE),
+    clear: createReadonlyMethod(TriggerOpTypes.CLEAR),
+    forEach: createForEach(true, false)
+  }
+
+  const shallowReadonlyInstrumentations: Record<string, Function> = {
+    get(this: MapTypes, key: unknown) {
+      return get(this, key, true, true)
+    },
+    get size() {
+      return size((this as unknown) as IterableCollections, true)
+    },
+    has(this: MapTypes, key: unknown) {
+      return has.call(this, key, true)
+    },
+    add: createReadonlyMethod(TriggerOpTypes.ADD),
+    set: createReadonlyMethod(TriggerOpTypes.SET),
+    delete: createReadonlyMethod(TriggerOpTypes.DELETE),
+    clear: createReadonlyMethod(TriggerOpTypes.CLEAR),
+    forEach: createForEach(true, true)
+  }
+
+  const iteratorMethods = ['keys', 'values', 'entries', Symbol.iterator]
+  iteratorMethods.forEach(method => {
+    mutableInstrumentations[method as string] = createIterableMethod(
+      method,
+      false,
+      false
+    )
+    readonlyInstrumentations[method as string] = createIterableMethod(
+      method,
+      true,
+      false
+    )
+    shallowInstrumentations[method as string] = createIterableMethod(
+      method,
+      false,
+      true
+    )
+    shallowReadonlyInstrumentations[method as string] = createIterableMethod(
+      method,
+      true,
+      true
+    )
+  })
+
+  return [
+    mutableInstrumentations,
+    readonlyInstrumentations,
+    shallowInstrumentations,
+    shallowReadonlyInstrumentations
+  ]
 }
 
-const shallowInstrumentations: Record<string, Function> = {
-  get(this: MapTypes, key: unknown) {
-    return get(this, key, false, true)
-  },
-  get size() {
-    return size((this as unknown) as IterableCollections)
-  },
-  has,
-  add,
-  set,
-  delete: deleteEntry,
-  clear,
-  forEach: createForEach(false, true)
-}
-
-const readonlyInstrumentations: Record<string, Function> = {
-  get(this: MapTypes, key: unknown) {
-    return get(this, key, true)
-  },
-  get size() {
-    return size((this as unknown) as IterableCollections, true)
-  },
-  has(this: MapTypes, key: unknown) {
-    return has.call(this, key, true)
-  },
-  add: createReadonlyMethod(TriggerOpTypes.ADD),
-  set: createReadonlyMethod(TriggerOpTypes.SET),
-  delete: createReadonlyMethod(TriggerOpTypes.DELETE),
-  clear: createReadonlyMethod(TriggerOpTypes.CLEAR),
-  forEach: createForEach(true, false)
-}
-
-const shallowReadonlyInstrumentations: Record<string, Function> = {
-  get(this: MapTypes, key: unknown) {
-    return get(this, key, true, true)
-  },
-  get size() {
-    return size((this as unknown) as IterableCollections, true)
-  },
-  has(this: MapTypes, key: unknown) {
-    return has.call(this, key, true)
-  },
-  add: createReadonlyMethod(TriggerOpTypes.ADD),
-  set: createReadonlyMethod(TriggerOpTypes.SET),
-  delete: createReadonlyMethod(TriggerOpTypes.DELETE),
-  clear: createReadonlyMethod(TriggerOpTypes.CLEAR),
-  forEach: createForEach(true, true)
-}
-
-const iteratorMethods = ['keys', 'values', 'entries', Symbol.iterator]
-iteratorMethods.forEach(method => {
-  mutableInstrumentations[method as string] = createIterableMethod(
-    method,
-    false,
-    false
-  )
-  readonlyInstrumentations[method as string] = createIterableMethod(
-    method,
-    true,
-    false
-  )
-  shallowInstrumentations[method as string] = createIterableMethod(
-    method,
-    false,
-    true
-  )
-  shallowReadonlyInstrumentations[method as string] = createIterableMethod(
-    method,
-    true,
-    true
-  )
-})
+const [
+  mutableInstrumentations,
+  readonlyInstrumentations,
+  shallowInstrumentations,
+  shallowReadonlyInstrumentations
+] = /* #__PURE__*/ createInstrumentations()
 
 function createInstrumentationGetter(isReadonly: boolean, shallow: boolean) {
   const instrumentations = shallow
@@ -357,21 +373,21 @@ function createInstrumentationGetter(isReadonly: boolean, shallow: boolean) {
 }
 
 export const mutableCollectionHandlers: ProxyHandler<CollectionTypes> = {
-  get: createInstrumentationGetter(false, false)
+  get: /*#__PURE__*/ createInstrumentationGetter(false, false)
 }
 
 export const shallowCollectionHandlers: ProxyHandler<CollectionTypes> = {
-  get: createInstrumentationGetter(false, true)
+  get: /*#__PURE__*/ createInstrumentationGetter(false, true)
 }
 
 export const readonlyCollectionHandlers: ProxyHandler<CollectionTypes> = {
-  get: createInstrumentationGetter(true, false)
+  get: /*#__PURE__*/ createInstrumentationGetter(true, false)
 }
 
 export const shallowReadonlyCollectionHandlers: ProxyHandler<
   CollectionTypes
 > = {
-  get: createInstrumentationGetter(true, true)
+  get: /*#__PURE__*/ createInstrumentationGetter(true, true)
 }
 
 function checkIdentityKeys(