how to export hash from a device in javascript

To export a hash in javascript, you can use the Web Crypto API to create a hash of your data, then export it as a base64-encoded string. Here's an example:

index.tsx
// create a hash of some data
const data = 'hello world';
const hash = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(data));

// export the hash as a base64-encoded string
const exportedHash = btoa(String.fromCharCode(...new Uint8Array(hash)));
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In this example, we use the crypto.subtle.digest method to generate a SHA-256 hash of the string 'hello world'. The result is a buffer of bytes which we then convert to a base64-encoded string using the btoa method.

Note that the crypto.subtle.digest method returns a Promise, so we use the await keyword to wait for the result before continuing. Also, the btoa method expects a string of characters, so we need to convert the byte buffer to an array of integers using the spread operator (...) and String.fromCharCode.