nl_tokens: Tries to resolve environment variables in the given value in case it is of type string else the given value is returned . Environment variable references look like : $ { env . MY_ENVIRONMENT_VARIABLE } optionally one can configure a fallback if the referenced env variable is not present . E . g . $ { env . NOT_SET : http : // localhost : 8080 } yields http : // localhost : 8080 .
pl_tokens: function resolveValue ( value ) { if ( typeof value !== 'string' ) { return value ; } // "${env.MY_ENVIRONMENT_VARIABLE:http://localhost:8080}".replace(/\$\{env\.([^:]*):?(.*)?\}/,"$1--split--$2").split("--split--") let regex = / \$\{env\.([^:]*):?(.*)?\} / ; // is this an environment variable reference with potential fallback? if ( ! regex . test ( value ) ) { return value ; } let tokens = value . replace ( regex , '$1--split--$2' ) . <mask> ( '--split--' ) ; let envVar = tokens [ 0 ] ; let envVal = process . env [ envVar ] ; let fallbackVal = tokens [ 1 ] ; return envVal || fallbackVal ; }