fix(type): avoid ThisType incompatibility of the nextTick function

[HcySunYang]

Fix: #3599

When the component has the emits options, the ThisType of the nextTick function may be incompatible with the component instance, e.g.

  defineComponent({
    emits: ['click']
  })

The $emit's type of the component instance is:

(event: "click", n: number) => void

But the $emit's type of ThisType of $nextTick is:

(event: string, n: number) => void

So there is a type incompatibility 'Type 'string' is not assignable to type '"click"''. At first, I tried to unify their types, but I failed, maybe @pikax can give it another try.

[pikax]

Suggested change

	this.$nextTick()
	this.$nextTick(function() {
	this.$emit('click', 1)
	this.$emit('input', 'foo')
	// @ts-expect-error
	expectError(this.$emit('nope'))
	// @ts-expect-error
	expectError(this.$emit('click'))
	// @ts-expect-error
	expectError(this.$emit('click', 'foo'))
	// @ts-expect-error
	expectError(this.$emit('input'))
	// @ts-expect-error
	expectError(this.$emit('input', 1))
	})

[pikax]

Suggested change

	export function nextTick(this: object | void, fn?: () => void): Promise<void> {
	export function nextTick<T = ComponentPublicInstance | void>(
	this: T,
	fn?: (this: T) => void
	): Promise<void> {

[HcySunYang]

@pikax will give a new PR