/**
 * Reads an environment variable from the current Node.js process.
 *
 * @param name - The name of the environment variable to read.
 * @returns The value of the environment variable if it exists, otherwise `undefined`.
 *
 * @example
 * process.env.API_KEY = "123";
 * const apiKey = readEnvVariable("API_KEY"); // "123"
 */
export declare function readEnvVariable(name: string): string | undefined;
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