How to use Environment Variables inside Vue3+Vite component library? - vue.js

Question

I have created a component as part of my component library that I am building with Vue3 and Vite. Everything works well, except when I try to use environment variables. I want the app that consumes this component library to be able to provide the component with environment specific data.
I have played around and found that if I have a .env file as part of the component library project, I am able to access those variables, but I want to be able to provide that during runtime and not during build time.
Here is my vite.config.ts
import { defineConfig } from "vite";
import { resolve } from "path";
import vue from "#vitejs/plugin-vue";
import dts from "vite-plugin-dts";
export default ({ mode }) => {
return defineConfig({
optimizeDeps: {
exclude: ["vue-demi"],
},
plugins: [
vue(),
dts({
insertTypesEntry: true,
}),
],
server: {
open: true,
},
build: {
lib: {
entry: resolve(__dirname, "src/lib.ts"),
name: "complib",
fileName: "complib",
},
rollupOptions: {
external: ["vue"],
output: {
globals: {
vue: "Vue",
},
exports: "named",
},
},
},
});
};
The entry looks like:
import { App, install } from "vue-demi";
import TestComp from "./components/TestComp.vue";
import "./tailwind.css";
install();
export default {
install: (app: App) => {
app.component("TestComp", TestComp);
},
};
export { Header };
And here is a minimal component TestComp.vue:
<script setup lang="ts">
import { onMounted } from "vue";
onMounted(() => {
console.log(import.meta.env.VITE_TEST_VAR);
});
</script>
<template>
<span>Test Comp</span>
</template>