Add method for process env validation

[mhf-ir]

I need to know is there any method for preprocess env variable such as.

export TRUSTED_IPS=192.168.1.10,192.168.1.10
nodejs app.js

const schema = {
  type: 'object',
  required: [ 'TRUSTED_IPS' ],
  properties: {
    TRUSTED_IPS: {
      type: 'array',
      items: {
          type: 'string',
          format: 'ipv4',      
      },
      process(var) {
        return var.split(',');
      },
      default: [],
    }
  }
}

console.log(process.env.TRUSTED_IPS); // [ '192.168.1.10' , '192.168.1.10' ]

process could be array or json object like:

export SAMPLE='{"foo": { "bar": "baz" }}';

In schema could be:

process: 'Array'
// or
process: 'JSON'
// or user define like above example

[mcollina]

Would you like to send a PR?

[mhf-ir]

#2

Documented also updated. see for detail and update it if needed.

Thanks