del() — vue Function Reference

Architecture documentation for the del() function in index.ts from the vue codebase.

Function typescript CoreInstance Reactivity calls 1

Entity Profile

CoreInstance→ Reactivity→ del() — vue Function Reference

Dependency Diagram

graph TD
  fdd41bd0_851f_d143_642f_dbe8762ae878["del()"]
  066df273_90c0_35dd_cd79_8e43c3f6c8ba["notify()"]
  fdd41bd0_851f_d143_642f_dbe8762ae878 -->|calls| 066df273_90c0_35dd_cd79_8e43c3f6c8ba
  style fdd41bd0_851f_d143_642f_dbe8762ae878 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/core/observer/index.ts lines 283–323

export function del(target: any[] | object, key: any) {
  if (__DEV__ && (isUndef(target) || isPrimitive(target))) {
    warn(
      `Cannot delete reactive property on undefined, null, or primitive value: ${target}`
    )
  }
  if (isArray(target) && isValidArrayIndex(key)) {
    target.splice(key, 1)
    return
  }
  const ob = (target as any).__ob__
  if ((target as any)._isVue || (ob && ob.vmCount)) {
    __DEV__ &&
      warn(
        'Avoid deleting properties on a Vue instance or its root $data ' +
          '- just set it to null.'
      )
    return
  }
  if (isReadonly(target)) {
    __DEV__ &&
      warn(`Delete operation on key "${key}" failed: target is readonly.`)
    return
  }
  if (!hasOwn(target, key)) {
    return
  }
  delete target[key]
  if (!ob) {
    return
  }
  if (__DEV__) {
    ob.dep.notify({
      type: TriggerOpTypes.DELETE,
      target: target,
      key
    })
  } else {
    ob.dep.notify()
  }
}