'Jenkins pipeline - Set environment variable in nodejs code

I have a Jenkins pipeline which is executing few nodejs files like below -

stage('validate_paramters') {
       steps {
               sh 'node ${WORKSPACE}/file1.js'
            }
        }
stage('test') {
        steps {
               sh 'node ${WORKSPACE}/file2.js'
            }
        }

How can I set variables in file1 which can be accessed inside file2? I tried below approach but its giving undefined as value -

file1.js -

process.env['OPERATIONS'] = "10"

file2.js -

var operations = process.env.OPERATIONS


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