Env file docker

This is a utility package to extract environment variables in Node.js, taking into account the possibility for ENV_FILE type variables as is used a lot in Docker containers.

Configuration

By default the _FILE variant will be preferred. This means if a file is set, it will try to load it before falling back on the environment variable as is. This behavior can be altered by setting the PreferType as shown below.

const envFile = require('env-file-docker');
 
envFile.setPreferType(envFile.PreferTypes.ENV); // the PreferType is envFile.PreferTypes.FILE by default
 
process.env.HELLO_FILE = '/some/file';
process.env.HELLO = 'world';
console.log(envFile('HELLO', 'default'));
// output will be world, since the environment variable as is is now preferred
 

Usage

const envFile = require('env-file-docker');
 
console.log(envFile('HELLO', 'default'));
// output 'default'
 
process.env.HELLO_FILE = '/some/file';
console.log(envFile('HELLO', 'default'));
// output is the content of '/some/file'
 
process.env.HELLO = 'world';
console.log(envFile('HELLO', 'default'));
// output 'world'