How to set a component non-reactive data in Vue 2?

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Vue sets all the properties in the data option to setters/getters to make them reactive. See Reactivity in depth

Since you want myArray to be static you can create it as a custom option which can be accessed using vm.$options

export default{
    data() {
        return{
            someReactiveData: [1, 2, 3]
        }
    },
    //custom option name myArray
    myArray: null,
    created() {
        //access the custom option using $options
        this.$options.myArray = ["value 1", "value 2"];
    }
}

you can iterate over this custom options in your template as follows:

<template>
    <ul>
        <li v-for="item in $options.myArray">{{ item }}</li>
    </ul>
</template>

Here is the fiddle

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