node - package.json: how to execute script which sets environment variables

Question

I'd like inside my package.json execute some script which will set environment variables that my app could use. I need something like this (in my package.json)

  "scripts": {
    "dev": "set-env-vars.sh && webpack-dev-server --hot --inline & cd server && NODE_ENV=development node app.js",
  },

This is my set-env-vars.sh file:

#!/bin/bash
export ENV_MONGODB_URI="mongodb://localhost:27017/mydb"
...

I know that I need use source or . to export my variables into shell, this is working in shell, but not for my package.json dev-script.

Any solutions to achieve that? Thank you.

teq · Accepted Answer · 2016-09-30 15:25:17Z

1

The problem is in single ampersand (&) after webpack-dev-server invocation. Trailing ampersand directs the shell to run the command in the background. In practice, your command will be split into 2 parts, which are going to be invoked in separate shells asynchronously. If you use ampersand (&) intentionally, then you should source env vars in both parts like this:

. ./set-env-vars.sh && webpack-dev-server --hot --inline & . ./set-env-vars.sh && cd server && NODE_ENV=development node app.js

so, variables from set-env-vars.sh will be available for both webpack-dev-server and node

Or if you want to run it synchronously:

. ./set-env-vars.sh && webpack-dev-server --hot --inline && cd server && NODE_ENV=development node app.js

edited Sep 30, 2016 at 15:25

answered Sep 30, 2016 at 15:11

teq

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3 Comments

CodeBy Over a year ago

The problem is that when I add . or source inside script, I have receive this: sh: line 0: .: set-env-vars.sh: file not found

teq Over a year ago

I think you should use ./set-env-vars.sh instead of set-env-vars.sh to execute file from current directory.

CodeBy Over a year ago

So finally this is works: webpack-dev-server --hot --inline & . ./set-env-vars.sh && cd server && NODE_ENV=development node app.js Thank you! )

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