export type FetchFn = (url: string, init: {
    method: string;
    headers: Record<string, string>;
    signal: AbortSignal;
}) => Promise<Response>;
export type GetEnvFn = (name: string) => string | undefined;
export interface FetchOidcOptions {
    fetchFn?: FetchFn;
    getEnv?: GetEnvFn;
    /** Audience claim requested from the runner. Defaults to "agentlint". */
    audience?: string;
}
/**
 * Request a GitHub Actions OIDC token. Returns the JWT string on success or
 * null if we're not on Actions, if the request fails, or if the response
 * shape is unexpected. Never throws.
 */
export declare function fetchGithubOidcToken(opts?: FetchOidcOptions): Promise<string | null>;
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