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Bun supports TLS out of the box, powered by BoringSSL. Enable TLS by passing in a value for key and cert; both are required to enable TLS. 
Bun.serve({
  tls: {
    key: Bun.file("./key.pem"), 
    cert: Bun.file("./cert.pem"), 
  },
});
The key and cert fields expect the contents of your TLS key and certificate, not a path to it. This can be a string, BunFile, TypedArray, or Buffer. 
Bun.serve({
  tls: {
    key: Bun.file("./key.pem"), // BunFile
    key: fs.readFileSync("./key.pem"), // Buffer
    key: fs.readFileSync("./key.pem", "utf8"), // string
    key: [Bun.file("./key1.pem"), Bun.file("./key2.pem")], // array of above
  },
});

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Passphrase

If your private key is encrypted with a passphrase, provide a value for passphrase to decrypt it. 
Bun.serve({
  tls: {
    key: Bun.file("./key.pem"),
    cert: Bun.file("./cert.pem"),
    passphrase: "my-secret-passphrase", 
  },
});

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CA Certificates

Optionally, you can override the trusted CA certificates by passing a value for ca. By default, the server will trust the list of well-known CAs curated by Mozilla. When ca is specified, the Mozilla list is overwritten. 
Bun.serve({
  tls: {
    key: Bun.file("./key.pem"), // path to TLS key
    cert: Bun.file("./cert.pem"), // path to TLS cert
    ca: Bun.file("./ca.pem"), // path to root CA certificate
  },
});

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Diffie-Hellman

To override Diffie-Hellman parameters: 
Bun.serve({
  tls: {
    dhParamsFile: "/path/to/dhparams.pem", // path to Diffie Hellman parameters
  },
});

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Server name indication (SNI)

To configure the server name indication (SNI) for the server, set the serverName field in the tls object. 
Bun.serve({
  tls: {
    serverName: "my-server.com", // SNI
  },
});
To allow multiple server names, pass an array of objects to tls, each with a serverName field. 
Bun.serve({
  tls: [
    {
      key: Bun.file("./key1.pem"),
      cert: Bun.file("./cert1.pem"),
      serverName: "my-server1.com", 
    },
    {
      key: Bun.file("./key2.pem"),
      cert: Bun.file("./cert2.pem"),
      serverName: "my-server2.com", 
    },
  ],
});