Rename macros $ref to ref

[bomzj]

What problem does this feature solve?

Regarding #420
For consistency sake, rename $ref to ref in order to have the same naming convention as other macros have e.g. defineProps, defineEmits. They are not prefixed with ugly $ sign coming from jquery/php, 'Hungarian' notations or other $$$ rich code.

I know that $ref is experimental, just would like you to consider this once you decide to adopt an approach to reactivity transformation.

What does the proposed API look like?

Old way

let x = $ref(1)

New way

let x = ref(1)

[leopiccionia]

Wouldn't it clash with already existing ref? How could it distinguish between sugared and non-sugared usage?

For example, given the following snippet:

let x = ref(1)
useSomething(x)

Should the compiler translate the second line to useSomething(x.value) or keep it as useSomething(x)? Using the same identifier ref for both usages may avoid gradual adoption and migration.

[quanzaiyu]

本来就是为了区分ref才使用$ref作为语法糖。你的value到底是ref的value，还是响应式对象里面的value呢？