This will set one or multiple environment variables to be available in your CircleCI run environment. Any existing environment variable will be overwritten. See unsetenv to delete an environment variable.
# Passing the key and the value
yarn run setenv USER_NAME=tim
# Passing only the key will read the value from the host ENV variables
yarn run setenv API_KEY
# You can also set several variables in one call
yarn run setenv USER_NAME=time API_KEY
const onCircle = require('on-circle');
await onCircle.setEnvironmentVariables({
USER_NAME: 'tim',
API_KEY: '4815162343',
});