export interface ChainMetadataWithRpcUrls {
    rpcUrls?: {
        http: string;
    }[];
}
interface ApplyRpcUrlOverridesOptions {
    chainNames?: string[];
    env?: NodeJS.ProcessEnv;
}
/**
 * Applies RPC URL overrides from environment variables.
 * Looks for variables with the form RPC_URL_<CHAIN_NAME>.
 */
export declare function applyRpcUrlOverridesFromEnv(chainMetadata: Record<string, ChainMetadataWithRpcUrls | undefined>, options?: ApplyRpcUrlOverridesOptions): string[];
export {};
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