core/packages/reactivity/__tests__/readonly.spec.ts

import {
  reactive,
  readonly,
  toRaw,
  isReactive,
  isReadonly,
  markRaw,
  effect,
  ref,
  shallowReadonly,
  isProxy
} from '../src'
import { mockWarn } from '@vue/shared'

/**
 * @see https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-4.html
 */
type Writable<T> = { -readonly [P in keyof T]: T[P] }

describe('reactivity/readonly', () => {
  mockWarn()

  describe('Object', () => {
    it('should make nested values readonly', () => {
      const original = { foo: 1, bar: { baz: 2 } }
      const wrapped = readonly(original)
      expect(wrapped).not.toBe(original)
      expect(isProxy(wrapped)).toBe(true)
      expect(isReactive(wrapped)).toBe(false)
      expect(isReadonly(wrapped)).toBe(true)
      expect(isReactive(original)).toBe(false)
      expect(isReadonly(original)).toBe(false)
      expect(isReactive(wrapped.bar)).toBe(false)
      expect(isReadonly(wrapped.bar)).toBe(true)
      expect(isReactive(original.bar)).toBe(false)
      expect(isReadonly(original.bar)).toBe(false)
      // get
      expect(wrapped.foo).toBe(1)
      // has
      expect('foo' in wrapped).toBe(true)
      // ownKeys
      expect(Object.keys(wrapped)).toEqual(['foo', 'bar'])
    })

    it('should not allow mutation', () => {
      const qux = Symbol('qux')
      const original = {
        foo: 1,
        bar: {
          baz: 2
        },
        [qux]: 3
      }
      const wrapped: Writable<typeof original> = readonly(original)

      wrapped.foo = 2
      expect(wrapped.foo).toBe(1)
      expect(
        `Set operation on key "foo" failed: target is readonly.`
      ).toHaveBeenWarnedLast()

      wrapped.bar.baz = 3
      expect(wrapped.bar.baz).toBe(2)
      expect(
        `Set operation on key "baz" failed: target is readonly.`
      ).toHaveBeenWarnedLast()

      wrapped[qux] = 4
      expect(wrapped[qux]).toBe(3)
      expect(
        `Set operation on key "Symbol(qux)" failed: target is readonly.`
      ).toHaveBeenWarnedLast()

      delete wrapped.foo
      expect(wrapped.foo).toBe(1)
      expect(
        `Delete operation on key "foo" failed: target is readonly.`
      ).toHaveBeenWarnedLast()

      delete wrapped.bar.baz
      expect(wrapped.bar.baz).toBe(2)
      expect(
        `Delete operation on key "baz" failed: target is readonly.`
      ).toHaveBeenWarnedLast()

      delete wrapped[qux]
      expect(wrapped[qux]).toBe(3)
      expect(
        `Delete operation on key "Symbol(qux)" failed: target is readonly.`
      ).toHaveBeenWarnedLast()
    })

    it('should not trigger effects', () => {
      const wrapped: any = readonly({ a: 1 })
      let dummy
      effect(() => {
        dummy = wrapped.a
      })
      expect(dummy).toBe(1)
      wrapped.a = 2
      expect(wrapped.a).toBe(1)
      expect(dummy).toBe(1)
      expect(`target is readonly`).toHaveBeenWarned()
    })
  })

  describe('Array', () => {
    it('should make nested values readonly', () => {
      const original = [{ foo: 1 }]
      const wrapped = readonly(original)
      expect(wrapped).not.toBe(original)
      expect(isProxy(wrapped)).toBe(true)
      expect(isReactive(wrapped)).toBe(false)
      expect(isReadonly(wrapped)).toBe(true)
      expect(isReactive(original)).toBe(false)
      expect(isReadonly(original)).toBe(false)
      expect(isReactive(wrapped[0])).toBe(false)
      expect(isReadonly(wrapped[0])).toBe(true)
      expect(isReactive(original[0])).toBe(false)
      expect(isReadonly(original[0])).toBe(false)
      // get
      expect(wrapped[0].foo).toBe(1)
      // has
      expect(0 in wrapped).toBe(true)
      // ownKeys
      expect(Object.keys(wrapped)).toEqual(['0'])
    })

    it('should not allow mutation', () => {
      const wrapped: any = readonly([{ foo: 1 }])
      wrapped[0] = 1
      expect(wrapped[0]).not.toBe(1)
      expect(
        `Set operation on key "0" failed: target is readonly.`
      ).toHaveBeenWarned()
      wrapped[0].foo = 2
      expect(wrapped[0].foo).toBe(1)
      expect(
        `Set operation on key "foo" failed: target is readonly.`
      ).toHaveBeenWarned()

      // should block length mutation
      wrapped.length = 0
      expect(wrapped.length).toBe(1)
      expect(wrapped[0].foo).toBe(1)
      expect(
        `Set operation on key "length" failed: target is readonly.`
      ).toHaveBeenWarned()

      // mutation methods invoke set/length internally and thus are blocked as well
      wrapped.push(2)
      expect(wrapped.length).toBe(1)
      // push triggers two warnings on [1] and .length
      expect(`target is readonly.`).toHaveBeenWarnedTimes(5)
    })

    it('should not trigger effects', () => {
      const wrapped: any = readonly([{ a: 1 }])
      let dummy
      effect(() => {
        dummy = wrapped[0].a
      })
      expect(dummy).toBe(1)
      wrapped[0].a = 2
      expect(wrapped[0].a).toBe(1)
      expect(dummy).toBe(1)
      expect(`target is readonly`).toHaveBeenWarnedTimes(1)
      wrapped[0] = { a: 2 }
      expect(wrapped[0].a).toBe(1)
      expect(dummy).toBe(1)
      expect(`target is readonly`).toHaveBeenWarnedTimes(2)
    })
  })

  const maps = [Map, WeakMap]
  maps.forEach((Collection: any) => {
    describe(Collection.name, () => {
      test('should make nested values readonly', () => {
        const key1 = {}
        const key2 = {}
        const original = new Collection([[key1, {}], [key2, {}]])
        const wrapped = readonly(original)
        expect(wrapped).not.toBe(original)
        expect(isProxy(wrapped)).toBe(true)
        expect(isReactive(wrapped)).toBe(false)
        expect(isReadonly(wrapped)).toBe(true)
        expect(isReactive(original)).toBe(false)
        expect(isReadonly(original)).toBe(false)
        expect(isReactive(wrapped.get(key1))).toBe(false)
        expect(isReadonly(wrapped.get(key1))).toBe(true)
        expect(isReactive(original.get(key1))).toBe(false)
        expect(isReadonly(original.get(key1))).toBe(false)
      })

      test('should not allow mutation & not trigger effect', () => {
        const map = readonly(new Collection())
        const key = {}
        let dummy
        effect(() => {
          dummy = map.get(key)
        })
        expect(dummy).toBeUndefined()
        map.set(key, 1)
        expect(dummy).toBeUndefined()
        expect(map.has(key)).toBe(false)
        expect(
          `Set operation on key "${key}" failed: target is readonly.`
        ).toHaveBeenWarned()
      })

      if (Collection === Map) {
        test('should retrieve readonly values on iteration', () => {
          const key1 = {}
          const key2 = {}
          const original = new Collection([[key1, {}], [key2, {}]])
          const wrapped: any = readonly(original)
          expect(wrapped.size).toBe(2)
          for (const [key, value] of wrapped) {
            expect(isReadonly(key)).toBe(true)
            expect(isReadonly(value)).toBe(true)
          }
          wrapped.forEach((value: any) => {
            expect(isReadonly(value)).toBe(true)
          })
          for (const value of wrapped.values()) {
            expect(isReadonly(value)).toBe(true)
          }
        })
      }
    })
  })

  const sets = [Set, WeakSet]
  sets.forEach((Collection: any) => {
    describe(Collection.name, () => {
      test('should make nested values readonly', () => {
        const key1 = {}
        const key2 = {}
        const original = new Collection([key1, key2])
        const wrapped = readonly(original)
        expect(wrapped).not.toBe(original)
        expect(isProxy(wrapped)).toBe(true)
        expect(isReactive(wrapped)).toBe(false)
        expect(isReadonly(wrapped)).toBe(true)
        expect(isReactive(original)).toBe(false)
        expect(isReadonly(original)).toBe(false)
        expect(wrapped.has(reactive(key1))).toBe(true)
        expect(original.has(reactive(key1))).toBe(false)
      })

      test('should not allow mutation & not trigger effect', () => {
        const set = readonly(new Collection())
        const key = {}
        let dummy
        effect(() => {
          dummy = set.has(key)
        })
        expect(dummy).toBe(false)
        set.add(key)
        expect(dummy).toBe(false)
        expect(set.has(key)).toBe(false)
        expect(
          `Add operation on key "${key}" failed: target is readonly.`
        ).toHaveBeenWarned()
      })

      if (Collection === Set) {
        test('should retrieve readonly values on iteration', () => {
          const original = new Collection([{}, {}])
          const wrapped: any = readonly(original)
          expect(wrapped.size).toBe(2)
          for (const value of wrapped) {
            expect(isReadonly(value)).toBe(true)
          }
          wrapped.forEach((value: any) => {
            expect(isReadonly(value)).toBe(true)
          })
          for (const value of wrapped.values()) {
            expect(isReadonly(value)).toBe(true)
          }
          for (const [v1, v2] of wrapped.entries()) {
            expect(isReadonly(v1)).toBe(true)
            expect(isReadonly(v2)).toBe(true)
          }
        })
      }
    })
  })

  test('calling reactive on an readonly should return readonly', () => {
    const a = readonly({})
    const b = reactive(a)
    expect(isReadonly(b)).toBe(true)
    // should point to same original
    expect(toRaw(a)).toBe(toRaw(b))
  })

  test('calling readonly on a reactive object should return readonly', () => {
    const a = reactive({})
    const b = readonly(a)
    expect(isReadonly(b)).toBe(true)
    // should point to same original
    expect(toRaw(a)).toBe(toRaw(b))
  })

  test('readonly should track and trigger if wrapping reactive original', () => {
    const a = reactive({ n: 1 })
    const b = readonly(a)
    // should return true since it's wrapping a reactive source
    expect(isReactive(b)).toBe(true)

    let dummy
    effect(() => {
      dummy = b.n
    })
    expect(dummy).toBe(1)
    a.n++
    expect(b.n).toBe(2)
    expect(dummy).toBe(2)
  })

  test('wrapping already wrapped value should return same Proxy', () => {
    const original = { foo: 1 }
    const wrapped = readonly(original)
    const wrapped2 = readonly(wrapped)
    expect(wrapped2).toBe(wrapped)
  })

  test('wrapping the same value multiple times should return same Proxy', () => {
    const original = { foo: 1 }
    const wrapped = readonly(original)
    const wrapped2 = readonly(original)
    expect(wrapped2).toBe(wrapped)
  })

  test('markRaw', () => {
    const obj = readonly({
      foo: { a: 1 },
      bar: markRaw({ b: 2 })
    })
    expect(isReadonly(obj.foo)).toBe(true)
    expect(isReactive(obj.bar)).toBe(false)
  })

  test('should make ref readonly', () => {
    const n: any = readonly(ref(1))
    n.value = 2
    expect(n.value).toBe(1)
    expect(
      `Set operation on key "value" failed: target is readonly.`
    ).toHaveBeenWarned()
  })

  describe('shallowReadonly', () => {
    test('should not make non-reactive properties reactive', () => {
      const props = shallowReadonly({ n: { foo: 1 } })
      expect(isReactive(props.n)).toBe(false)
    })

    test('should make root level properties readonly', () => {
      const props = shallowReadonly({ n: 1 })
      // @ts-ignore
      props.n = 2
      expect(props.n).toBe(1)
      expect(
        `Set operation on key "n" failed: target is readonly.`
      ).toHaveBeenWarned()
    })

    // to retain 2.x behavior.
    test('should NOT make nested properties readonly', () => {
      const props = shallowReadonly({ n: { foo: 1 } })
      // @ts-ignore
      props.n.foo = 2
      expect(props.n.foo).toBe(2)
      expect(
        `Set operation on key "foo" failed: target is readonly.`
      ).not.toHaveBeenWarned()
    })
  })
})