async function sha256(message) {
    let crypto;

    // Check for browser environment
    if (typeof window !== 'undefined' && window.crypto && window.crypto.subtle) {
        crypto = window.crypto;
    } 
    // Check for Node.js environment
    else if (typeof global !== 'undefined' && global.crypto) {
        crypto = global.crypto;
    } 
    // Fallback to native Node.js crypto module
    else {
        crypto = require('crypto'); // maybe wrap with try-catch in case of uncovered runtimes... or you maybe want to fail the program because there's no way to calc hash then
    }

    // In the browser, use crypto.subtle.digest
    if (crypto.subtle) {
        const encoder = new TextEncoder();
        const data = encoder.encode(message);
        const hashBuffer = await crypto.subtle.digest('SHA-256', data);
        const hashArray = Array.from(new Uint8Array(hashBuffer));
        const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
        return hashHex;
    } 
    // In Node.js, use the crypto module's hash function
    else {
        return crypto.createHash('sha256').update(message).digest('hex');
    }
}

// Example usage:
sha256('Hello, world!').then(hash => {
    console.log('SHA-256 hash:', hash);
});