In Vue.js, if you need to declare global variables or constants that are accessible across your entire application, there are multiple ways you can do it.

Using Vue.prototype:

You can add properties or functions to Vue.prototype to make them globally accessible in your components. This is the easiest way to declare global variables in vuejs

import Vue from 'vue';
Vue.prototype.$myGlobalVariable = 'some value';

Using Vuex Store:

You can create a Vuex store and define global variables or state that can be accessed across your components.

// store.js
import { createStore } from 'vuex';
export default createStore({
 state: {
   globalVariable: 'some value',

Then, in your components, you can access the global variable by using Vuex’s mapState, or directly via this.$store.state.globalVariable.

Using Environment Variables:

For constants that don’t change during runtime or for sensitive information like API keys, using environment variables can be a good practice. You can use tools like dotenv for managing environment variables.

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