@heroku-cli/command/lib/prompter.js

base class for Heroku CLI commands

class Prompter {
    /**
     * Wraps inquirer's prompt module so that prompt UI (question text, mask
     * characters, cursor escapes) writes to stderr by default. Routing to stdout
     * — inquirer's default — corrupts piped output (e.g. `heroku run … | tee`).
     *
     * Tests can override `input` and/or `output` via the optional second arg.
     */
    async prompt(questions, streamOpts = {}) {
        const inquirer = (await import('inquirer')).default;
        const promptModule = inquirer.createPromptModule({
            output: process.stderr,
            ...streamOpts,
        });
        return promptModule(questions);
    }
}
export const prompter = new Prompter();