Description

Since Vite 8.0.6, running vite build under the Bun runtime fails with:

TypeError: promises.getDefaultResultOrder is not a function. (In 'promises.getDefaultResultOrder()', 'promises.getDefaultResultOrder' is undefined)
    at getLocalhostAddressIfDiffersFromDNS (node_modules/vite/dist/node/chunks/node.js:2067:15)
    at resolveHostname (node_modules/vite/dist/node/chunks/node.js:2082:31)
    at resolveDevToolsConfig (node_modules/vite/dist/node/chunks/node.js:33872:34)
    at resolveConfig (node_modules/vite/dist/node/chunks/node.js:34317:39)

This works fine with Vite 8.0.5 and earlier.

Root cause

Introduced by commit 56ec256 (PR #22151): "perf: early return in getLocalhostAddressIfDiffersFromDNS when DNS order is verbatim".

packages/vite/src/node/utils.ts imports:

import { promises as dns } from 'node:dns'

The new early-return guard added by that PR calls:

if (dns.getDefaultResultOrder() === 'verbatim') {

Because dns is aliased from dns.promises, this resolves at runtime to dns.promises.getDefaultResultOrder().

Bun implements dns.getDefaultResultOrder (sync) but not dns.promises.getDefaultResultOrder. Tested on Bun 1.3.11 (latest stable) and 1.3.12 (canary) — both missing the method.

Suggested fix

Use the synchronous dns module for this call instead of dns.promises:

import dns from 'node:dns'
// ...
if (dns.getDefaultResultOrder() === 'verbatim') {

Or import both:

import { promises as dnsPromises } from 'node:dns'
import dns from 'node:dns'

getDefaultResultOrder is a synchronous function by nature, so using dns.promises for it is unnecessary.

Environment

• Vite: 8.0.6 (broken), 8.0.5 (works)
• Runtime: Bun 1.3.10 / 1.3.11 / 1.3.12-canary
• OS: Linux (Docker oven/bun:1.3)