method Command.prototype.getEnvVarimport { Command } from "https://dotland.deno.dev/x/cliffy@v0.19.0/mod.ts"; getEnvVar(name: string, hidden?: boolean): IEnvVar | undefinedGet environment variable by name. Parametersname: stringName of the environment variable. optionalhidden: booleanInclude hidden environment variable. ReturnsIEnvVar | undefined