Sapper Environment

This module helps you manage env variables in your Sapper App.

The code is really simple and you should be able to manage env variables on your own without this, see DIY section.

So, use this directly or as a guide, just don't hard code your config variables :)

Usage

This module looks for any env variable prefixed with SAPPER_APP_ (configurable) and creates an object that you can use in the build process.

1. Install

npm install sapper-environment --save#or
yarn add sapper-environment 

2. Require

const sapperEnv = require('sapper-environment');

3. Use at compile time

If using rollup template, add ...sapperEnv() to the client replace plugin options.

client: {
    input: config.client.input(),
    output: config.client.output(),
    plugins: [
        replace({
            ...sapperEnv(),
            'process.browser': true,
            'process.env.NODE_ENV': JSON.stringify(mode),
        }),

If using webpack template, add ...sapperEnv() to the webpack.DefinePlugin options.

module.exports = {
    client: {
        //Omitted for readability...
        plugins: [
            // pending https://github.com/sveltejs/svelte/issues/2377
            // dev && new webpack.HotModuleReplacementPlugin(),
            new webpack.DefinePlugin({
                ...sapperEnv(),
                'process.browser': true,
                'process.env.NODE_ENV': JSON.stringify(mode)
            }),

4. Use env variables in Sapper!

Let's say you defined a env variable called SAPPER_APP_API_URL=http://localhost:3000/.

Either from a .env file created at the root of your project with this content:

SAPPER_APP_API_URL=http://localhost:3000/

Or when running/building sapper:

SAPPER_APP_API_URL=http://localhost:3000/ npm run sapper dev

Or from your favorite IDE, from Netlify or really anywhere.

Then from any svelte component in your Sapper App:

console.log(process.env.SAPPER_APP_API_URL)

And you should see http://localhost:3000/ in the console.