unenv `createMock`, but optimized

proxy.ts

const fn = function () {}

function createMock(name: string, overrides: Record<any, any> = {}): any {
  fn.prototype.name = name
  const props: Record<any, any> = {}
  return new Proxy(fn, {
    get(_target, prop) {
      if (prop === 'caller') {
        return null
      }
      if (prop === '__createMock__') {
        return createMock
      }
      if (prop === '__unenv__') {
        return true
      }
      if (prop in overrides) {
        return overrides[prop as keyof typeof overrides]
      }
      return (
        props[prop as keyof typeof props] ||= createMock(`${name}.${prop.toString()}`)
      )
    },
    apply(_target, _this, _args) {
      return createMock(`${name}()`)
    },
    construct(_target, _args, _newT) {
      return createMock(`[${name}]`) as object
    },
  })
}

export default createMock('mock')