How to set NODE_ENV for snowpack build?

[martinburger]

Hi:

I have been struggling with setting the NODE_ENV variable to a custom value different than production for the snowpack build command.

I tried many different ways:

• running NODE_ENV=staging npx snowpack build --clean;
• running NODE_ENV=staging npm run build -- --clean;
• using NODE_ENV=staging npm run build -- --clean in npm's "scripts" field;
• using cross-env NODE_ENV=staging npm run build -- --clean in npm's "scripts" field;
• using cross-env NODE_ENV=staging snowpack build --clean in npm's "scripts" field;
• and many, many more.

Every time, the build process ends up with setting MODE and NODE_ENV to production in file __snowpack__/env.js.

Whenever I substitute the command to trigger the build process with node -e 'console.log(process.env.NODE_ENV);', the expected value staging gets printed.

What am I missing? Or, is this a bug?

As far as I understand Snowpack's source code, the actual value of NODE_ENV should be taken into account by the build process:

https://github.com/snowpackjs/snowpack/blob/03f0c150bbac89cec4a07e007b72a2575d5a520e/snowpack/src/commands/build.ts#L62

Kind regards,

Martin

[N8-B]

Looking at the code, it looks like the env variables are set here:
https://github.com/snowpackjs/snowpack/blob/03f0c150bbac89cec4a07e007b72a2575d5a520e/snowpack/src/commands/build.ts#L364
Then here...
https://github.com/snowpackjs/snowpack/blob/03f0c150bbac89cec4a07e007b72a2575d5a520e/snowpack/src/build/build-import-proxy.ts#L234-L240
...the env variables can be either 'development' or 'production'.

Out of curiosity, what's the difference in your 'staging' and 'production' builds as far as snowpack is concerned?

[demosetupuser]

"scripts": {
"start": "snowpack dev",
"build:local": "env $(grep -Z -v '^#' .env.local.target | xargs -0) snowpack build",
"build:staging": "env $(grep -Z -v '^#' .env.staging.target | xargs -0) snowpack build",
"build:production": "env $(grep -Z -v '^#' .env.production.target | xargs -0) snowpack build",
},

https://medium.com/swlh/do-not-relay-on-node-env-hygiene-of-environment-variables-9ffba0cb5544
https://bhirmbani.medium.com/managing-multiple-environment-in-snowpack-18ba46ed78b
https://stackoverflow.com/questions/19331497/set-environment-variables-from-file-of-key-value-pairs

E: Ah, I only now learned about env-cmd...
https://dev.to/jam3/managing-env-variables-for-provisional-builds-h37