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Vue 'watch' problem: Declaration emit for this file requires using private name 'handler'. An explicit type annotation may unblock declaration emit

I use 'watch' in the component, just like:

watch: {
        config:{
            handler: function(){
                this.colorAnalysis = this.$props.config;
            },
            deep: true,
            immediate: true
        },

It can work, but show message below:

Declaration emit for this file requires using private name 'handler'. An explicit type annotation may unblock declaration emit.

I can not figure out what's the problem, and how to prevent this situation. Please give me some directions.Thanks.

7 months ago · Juan Pablo Isaza

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Answer 1 · 2022-07-03T18:15:51.798Z

I do not figure out the reason. But when I change format to:

watch: {
    config() {
        this.colorAnalysis = this.$props.config;
    },
}

the message disappeared!