Browser and worker usage

sealed-lattice currently ships one real cryptographic helper: sha256Hex. The runtime requirement is intentionally small, which makes the browser and worker story straightforward.

Browser main thread

Use the root package and rely on the platform Web Crypto implementation.

import { sha256Hex } from 'sealed-lattice';

const digest = await sha256Hex('sealed-lattice');

console.log(digest);

What the runtime must provide:

• globalThis.crypto.subtle.digest
• TextEncoder
• ESM support

Web Workers

The same helper works inside a dedicated worker as long as the worker runtime exposes the same Web Crypto surface.

import { sha256Hex } from 'sealed-lattice';

self.addEventListener('message', async (event) => {
    const digest = await sha256Hex(event.data);
    self.postMessage(digest);
});

Input rules

• strings are encoded as UTF-8 before hashing
• Uint8Array inputs are copied before hashing
• output is always lowercase hexadecimal

Failure mode

If the runtime does not expose globalThis.crypto.subtle.digest, the helper throws UnsupportedRuntimeError instead of silently falling back to a weaker or inconsistent path.

Use this package only in runtimes where the native Web Crypto surface is part of your supported deployment contract.