/**
 * Get System Environment Variables exposed by Vercel.
 *
 * @see https://vercel.com/docs/projects/environment-variables/system-environment-variables#system-environment-variables
 */
export declare const getEnv: (env?: {
    [key: string]: string | undefined;
}) => {
    /**
     * An indicator to show that System Environment Variables have been exposed to your project's Deployments.
     * @example "1"
     */
    VERCEL: string | undefined;
    /**
     * An indicator that the code is running in a Continuous Integration environment.
     * @example "1"
     */
    CI: string | undefined;
    /**
     * The Environment that the app is deployed and running on.
     * @example "production"
     */
    VERCEL_ENV: string | undefined;
    /**
     * The domain name of the generated deployment URL. The value does not include the protocol scheme https://.
     * NOTE: This Variable cannot be used in conjunction with Standard Deployment Protection.
     * @example "*.vercel.app"
     */
    VERCEL_URL: string | undefined;
    /**
     * The domain name of the generated Git branch URL. The value does not include the protocol scheme https://.
     * @example "*-git-*.vercel.app"
     */
    VERCEL_BRANCH_URL: string | undefined;
    /**
     * A production domain name of the project. This is useful to reliably generate links that point to production such as OG-image URLs.
     * The value does not include the protocol scheme https://.
     * @example "myproject.vercel.app"
     */
    VERCEL_PROJECT_PRODUCTION_URL: string | undefined;
    /**
     * The ID of the Region where the app is running.
     *
     * Possible values:
     * - arn1 (Stockholm, Sweden)
     * - bom1 (Mumbai, India)
     * - cdg1 (Paris, France)
     * - cle1 (Cleveland, USA)
     * - cpt1 (Cape Town, South Africa)
     * - dub1 (Dublin, Ireland)
     * - fra1 (Frankfurt, Germany)
     * - gru1 (São Paulo, Brazil)
     * - hkg1 (Hong Kong)
     * - hnd1 (Tokyo, Japan)
     * - iad1 (Washington, D.C., USA)
     * - icn1 (Seoul, South Korea)
     * - kix1 (Osaka, Japan)
     * - lhr1 (London, United Kingdom)
     * - pdx1 (Portland, USA)
     * - sfo1 (San Francisco, USA)
     * - sin1 (Singapore)
     * - syd1 (Sydney, Australia)
     * - dev1 (Development Region)
     *
     * @example "iad1"
     */
    VERCEL_REGION: string | undefined;
    /**
     * The unique identifier for the deployment, which can be used to implement Skew Protection.
     * @example "dpl_7Gw5ZMBpQA8h9GF832KGp7nwbuh3"
     */
    VERCEL_DEPLOYMENT_ID: string | undefined;
    /**
     * When Skew Protection is enabled in Project Settings, this value is set to 1.
     * @example "1"
     */
    VERCEL_SKEW_PROTECTION_ENABLED: string | undefined;
    /**
     * The Protection Bypass for Automation value, if the secret has been generated in the project's Deployment Protection settings.
     */
    VERCEL_AUTOMATION_BYPASS_SECRET: string | undefined;
    /**
     * The Git Provider the deployment is triggered from.
     * @example "github"
     */
    VERCEL_GIT_PROVIDER: string | undefined;
    /**
     * The origin repository the deployment is triggered from.
     * @example "my-site"
     */
    VERCEL_GIT_REPO_SLUG: string | undefined;
    /**
     * The account that owns the repository the deployment is triggered from.
     * @example "acme"
     */
    VERCEL_GIT_REPO_OWNER: string | undefined;
    /**
     * The ID of the repository the deployment is triggered from.
     * @example "117716146"
     */
    VERCEL_GIT_REPO_ID: string | undefined;
    /**
     * The git branch of the commit the deployment was triggered by.
     * @example "improve-about-page"
     */
    VERCEL_GIT_COMMIT_REF: string | undefined;
    /**
     * The git SHA of the commit the deployment was triggered by.
     * @example "fa1eade47b73733d6312d5abfad33ce9e4068081"
     */
    VERCEL_GIT_COMMIT_SHA: string | undefined;
    /**
     * The message attached to the commit the deployment was triggered by.
     * @example "Update about page"
     */
    VERCEL_GIT_COMMIT_MESSAGE: string | undefined;
    /**
     * The username attached to the author of the commit that the project was deployed by.
     * @example "johndoe"
     */
    VERCEL_GIT_COMMIT_AUTHOR_LOGIN: string | undefined;
    /**
     * The name attached to the author of the commit that the project was deployed by.
     * @example "John Doe"
     */
    VERCEL_GIT_COMMIT_AUTHOR_NAME: string | undefined;
    /**
     * The git SHA of the last successful deployment for the project and branch.
     * NOTE: This Variable is only exposed when an Ignored Build Step is provided.
     * @example "fa1eade47b73733d6312d5abfad33ce9e4068080"
     */
    VERCEL_GIT_PREVIOUS_SHA: string | undefined;
    /**
     * The pull request id the deployment was triggered by. If a deployment is created on a branch before a pull request is made, this value will be an empty string.
     * @example "23"
     */
    VERCEL_GIT_PULL_REQUEST_ID: string | undefined;
};