export declare function loadEsmModule<T>(modulePath: string | URL): Promise<T>;
export declare function assertIsError(value: unknown): asserts value is Error & {
    code?: string;
};
export declare function isPackageInstalled(root: string, name: string): boolean;
export declare function getInstalledPackageVersionFromRoot(root: string, name: string): string | null;
export declare function assertNever(input: never): never;
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