type RegistryFetch = (url: string, init: RequestInit) => Promise<{
    status: number;
}>;
interface NpmPackageNameAvailabilityBase {
    packageName: string;
}
export type NpmPackageNameAvailabilityUnknown = (NpmPackageNameAvailabilityBase & {
    error: string;
    status: "unknown";
    statusCode?: never;
}) | (NpmPackageNameAvailabilityBase & {
    error?: never;
    status: "unknown";
    statusCode: number;
});
export type NpmPackageNameAvailability = (NpmPackageNameAvailabilityBase & {
    status: "available";
}) | (NpmPackageNameAvailabilityBase & {
    status: "exists";
}) | NpmPackageNameAvailabilityUnknown;
export type NpmPackageNameAvailabilityStatus = NpmPackageNameAvailability["status"];
export interface CheckNpmPackageNameAvailabilityOptions {
    fetch?: RegistryFetch;
    registryUrl?: string;
    timeoutMilliseconds?: number;
}
export declare const checkNpmPackageNameAvailability: (packageName: string, options?: CheckNpmPackageNameAvailabilityOptions) => Promise<NpmPackageNameAvailability>;
export {};
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