Functions

Function forms

Function declarations and arrow functions are supported:

function formatUser(user) {
  return `${user.id}:${user.name}`
}

const isActive = (user) => user.active === true

Use whichever form makes ownership and this behavior clearest.

Callbacks

Callbacks are common in Node-style APIs and array methods:

items
  .filter((item) => item.enabled)
  .map((item) => item.name)

For public module APIs, prefer named functions when the callback is reused or tested independently.

Async functions

Async functions work for request handlers, setup routines, and dependency calls:

export async function loadSettings() {
  const raw = await readFile('settings.json', 'utf8')
  return JSON.parse(raw)
}

Make failures explicit with try / catch near the boundary where you can add context.

Patterns to avoid

Avoid runtime function construction:

new Function('return process.env.SECRET')

Prefer explicit imports and named functions. They are easier for Gun to check and easier for your team to review.