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1. Retrieve the mime type via the types... Retrieve the mime type via the types magic number from a base 64 string

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   export async function getMimeType(base64String: string): Promise<string> {

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       // convert to data url

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       const url = base64String.startsWith('data') ? base64String : `data:undefined;base64,${base64String}`;

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       const buffer = await urlToArrayBuffer(url);

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       const uint = new Uint8Array(buffer);

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