A gist containing all System Environment Variables from Vercel in `.d.ts` form so it can be used from a TypeScript deployed project

vercel.env.d.ts

/**
 * For more info on this variables, please check System Environment Variables on Vercel:
 *
 * https://vercel.com/docs/concepts/projects/environment-variables/system-environment-variables#system-environment-variables
 *
 * - Palhari, 2023/6/13
 */

declare namespace NodeJS {
  export interface ProcessEnv {
    /**
     * An indicator that the app is deployed and running on Vercel.
     *
     * Example: `1`.
     */
    VERCEL: number;

    /**
     * An indicator that the code is running in a Continuous Integration environment.
     *
     * Example: `1`.
     *
     * **NOTE**: This Variable is only exposed during Build Step.
     */
    CI: number;

    /**
     * The Environment that the app is deployed and running on.
     *
     * The value can be either `production`, `preview`, or `development`.
     */
    VERCEL_ENV: "production" | "preview" | "development";

    /**
     * The domain name of the generated deployment URL.
     *
     * Example: `*.vercel.app`.
     *
     * The value does not include the protocol scheme `https://`.
     */
    VERCEL_URL: string;

    /**
     * The domain name of the generated Git branch URL.
     *
     * Example: *-git-*.vercel.app.
     *
     * The value does not include the protocol scheme `https://`.
     */
    VERCEL_BRANCH_URL: string;

    /**
     * The ID of the Region where the app is running.
     *
     * Example: `cdg1`. **NOTE**: This Variable is only exposed during Runtime for Serverless Functions.
     */
    VERCEL_REGION: string;

    /**
     * The Git Provider the deployment is triggered from.
     *
     * Example: `github`.
     */
    VERCEL_GIT_PROVIDER: string;

    /**
     * The origin repository the deployment is triggered from.
     *
     * Example: `my-site`.
     */
    VERCEL_GIT_REPO_SLUG: string;

    /**
     * The account that owns the repository the deployment is triggered from.
     *
     * Example: `acme`.
     */
    VERCEL_GIT_REPO_OWNER: string;

    /**
     * The ID of the repository the deployment is triggered from.
     *
     * Example: `117716146`.
     */
    VERCEL_GIT_REPO_ID: number;

    /**
     * The git branch of the commit the deployment was triggered by.
     *
     * Example: `improve-about-page`.
     */
    VERCEL_GIT_COMMIT_REF: string;

    /**
     * The git SHA of the commit the deployment was triggered by.
     *
     * Example: `fa1eade47b73733d6312d5abfad33ce9e4068081`.
     */
    VERCEL_GIT_COMMIT_SHA: string;

    /**
     * The message attached to the commit the deployment was triggered by.
     *
     * Example: `Update about page`.
     */
    VERCEL_GIT_COMMIT_MESSAGE: string;

    /**
     * The username attached to the author of the commit that the project was deployed by.
     *
     * Example: `johndoe`.
     */
    VERCEL_GIT_COMMIT_AUTHOR_LOGIN: string;

    /**
     * The name attached to the author of the commit that the project was deployed by.
     *
     * Example: `John Doe`.
     */
    VERCEL_GIT_COMMIT_AUTHOR_NAME: string;

    /**
     * The git SHA of the last successful deployment for the project and branch.
     *
     * Example: `fa1eade47b73733d6312d5abfad33ce9e4068080.`
     *
     * **NOTE**: This Variable is only exposed when an Ignored Build Step is provided.
     */
    VERCEL_GIT_PREVIOUS_SHA: string;

    /**
     * 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: number;
  }
}