Function expandEnvs

src/expand-envs.ts:7–12

(str: string, envs: Environment)

 * if the environment variable doesn't exist, it leaves it as is.
*/
export function expandEnvs (str: string, envs: Environment): string {
  return str.replace(/(?<!\\)\$(\{\w+\}|\w+)?/g, (varName) => {
    const varValue = envs[varName.startsWith('${') ? varName.slice(2, varName.length - 1) : varName.slice(1)]
    return varValue ?? varName
  })
}