/**
 * expandEnvs Replaces $var in args and command with environment variables
 * if the environment variable doesn't exist, it leaves it as is.
*/
export function expandEnvs(str, envs) {
    return str.replace(/(?<!\\)\$[a-zA-Z0-9_]+/g, (varName) => {
        const varValue = envs[varName.slice(1)];
        // const test = 42;
        return varValue ?? varName;
    });
}