/**
 * Sets or removes an environment variable at runtime.
 *
 * - If a `value` is provided (string, including empty string), it will be assigned to `process.env[name]`.
 * - If the `value` is `undefined` or `null`, the environment variable will be deleted.
 *
 * @param name - The name of the environment variable to modify.
 * @param value - The value to set. If `undefined` or `null`, the variable will be removed.
 *
 * @example
 * writeEnvVariable("API_KEY", "12345");
 * console.log(process.env.API_KEY); // "12345"
 *
 * writeEnvVariable("API_KEY", undefined);
 * console.log(process.env.API_KEY); // undefined
 */
export declare function writeEnvVariable(name: string, value: string | undefined | null): void;
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