Typescript blob to base64

You can do it by using FileReader as follows: 

convertBlobToBase64 = (blob) => new Promise((resolve, reject) => {
    const reader = new FileReader;
    reader.onerror = reject;
    reader.onload = () => {
        resolve(reader.result);
    };
    reader.readAsDataURL(blob);
});

const base64String = await convertBlobToBase64(blob);

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