export declare function requireValue(value: string | undefined, opts: {
    name: string;
    env: string;
}): string;
export declare function optionalEnv(value: string | undefined, env: string): string | undefined;
export declare function readFileBlob(path: string, contentType?: string): Promise<Blob>;
export declare function readFileArrayBuffer(path: string): Promise<ArrayBuffer>;
export declare function inferContentType(path: string, fallback?: string): string;
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