no-try-promise.md

no-try-promise

An exception (including reject) thrown by a promise will not be caught be a nesting try block, due to the asynchronous nature of execution. Instead, use catch method of Promise or wrap it inside await expression.

Rule reports try-catch statements containing nothing else but call(s) to a function returning Promise (thus it's less likely that catch is intended to catch something else than Promise rejection).

Noncompliant Code Example

function runPromise() {
  return Promise.reject("rejection reason");
}

function foo() {
  try { // Noncompliant, the catch clause of the 'try' will not be executed for the code inside promise
    runPromise();
  } catch (e) {
    console.log("Failed to run promise", e);
  }
}

Compliant Solution

function foo() {
  runPromise().catch(e => console.log("Failed to run promise", e));
}

// or
async function foo() {
  try {
    await runPromise();
  } catch (e) {
    console.log("Failed to run promise", e);
  }
}