How to inject Global constant to a vue component <style>? - vue.js

Question

I'm searching how to inject a global (THEME_NAME in my example) to all the vue components:
<template>..</template>
<style lang="scss">
#import "bulmaswatch/<%=THEME_NAME=>/bulmaswatch.scss";
.foo {
color: $primary;
}
</style>
Context:
I'm using the darkly theme of bulma css in my vue application (vue Cli 3)
<template>..</template>
<style lang="scss">
#import "bulmaswatch/darkly/bulmaswatch.scss";
.foo {
color: $primary;
}
</style>
In order to switch to the cyborg theme, I will have to replace darkly with cyborg everywhere...
Is there a better way? Something like
<template>..</template>
<style lang="scss">
#import "bulmaswatch/<%=THEME_NAME=>/bulmaswatch.scss";
.foo {
color: $primary;
}
</style>
then somewhere in Webpack or vue.config.js, we can decide what is the theme
configureWebpack: () => {
return {
plugins: [
new webpack.DefinePlugin({
THEME_NAME: "cyborg"
}),
],
}
}

Answer 1

In order to switch to the cyborg theme, I will have to replace darkly with cyborg everywhere...
Not if you use the re-export pattern.
There's no need for any external libraries and codegen magics with webpack.
Basically, you create a file where you import your theme.
Let's call it _my-bulma-theme.scss and let's import darkly for now.
// _my-bulma-theme.scss
#import "bulmaswatch/darkly/bulmaswatch.scss";
In your code, you import this file instead of importing from Bulma directly:
// some-component.vue
<style>
#import "../../my-bulma-theme";
</style>
// some-other-component.vue
<style>
#import "../../my-bulma-theme";
</style>
Now, when you want to change the theme, you just need to change it in one place: the _my-bulma-theme.scss file.
// _my-bulma-theme.scss
#import "bulmaswatch/cyborg/bulmaswatch.scss";