method Command.prototype.hasEnvVarRe-exportimport { Command } from "https://deno.land/x/lume@v1.16.1/deps/cliffy.ts"; hasEnvVar(name: string, hidden?: boolean): booleanChecks whether the command has an environment variable with given name or not. Parametersname: stringName of the environment variable. optionalhidden: booleanInclude hidden environment variable. Returnsboolean