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blob-to-base64.ts
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blob-to-base64.ts
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/**
* Converts Blob to Base64.
*
* @param blob - Blob.
* @returns - Base64.
*/
export async function blobToBase64(blob: Blob): Promise<string> {
return typeof FileReader === 'function'
? blobToBase64Browser(blob)
: blobToBase64Node(blob);
}
enum Event {
error = 'error',
loadend = 'loadend',
}
/**
* Converts Blob to Base64 in the browser.
*
* @param blob - Blob.
* @returns - Base64.
*/
async function blobToBase64Browser(blob: Blob): Promise<string> {
return new Promise((resolve, reject) => {
try {
const reader = new FileReader();
const handleLoadend = () => {
resolve(reader.result as string);
reader.removeEventListener(Event.loadend, handleLoadend);
};
reader.addEventListener(Event.loadend, handleLoadend);
/* istanbul ignore next */
const handleError = () => {
reject(reader.error);
reader.removeEventListener(Event.error, handleError);
};
reader.addEventListener(Event.error, handleError);
reader.readAsDataURL(blob);
} catch (error) {
/* istanbul ignore next */
reject(error);
}
});
}
const defaultMimeType = 'application/octet-stream';
/**
* Converts Blob to Base64 in Node.js.
*
* @param blob - Blob.
* @returns - Base64.
*/
async function blobToBase64Node(blob: Blob): Promise<string> {
const buffer = Buffer.from(await blob.text());
const mimeType = blob.type || defaultMimeType;
return `data:${mimeType};base64,${buffer.toString('base64')}`;
}