promise/no-nesting

A then() inside a then() adds a level of indentation for every step, and a catch() on the inner chain doesn't see errors from the outer one. Return the inner promise and continue the chain one level up.

A nested callback that uses a variable from the outer callback can't move up, so it isn't reported.

Configure#

Off by default. To turn it on:

[lint.rules]
"promise/no-nesting" = "error" # or "warn"

Examples#

getUser(id).then(user => {
  return getOrders(user).then(orders => render(orders));
});

getUser(id)
  .then(user => getOrders(user))
  .then(orders => render(orders));

Here the inner callback needs user:

getUser(id).then(user => {
  return getOrders(user).then(orders => render(user, orders));
});