Prevent unhandled promises in createAsyncThunk

jest.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+  setupFilesAfterEnv: ['./jest.setup.js']
+}

jest.setup.js

@@ -0,0 +1,7 @@
+process.on('unhandledRejection', error => {
+  console.error(
+    `We throw this specifically to break tests if a promise is not handled`,
+    error
+  )
+  throw error
+})

src/createAsyncThunk.test.ts

@@ -549,6 +549,21 @@ describe('conditional skipping of asyncThunks', () => {
     expect(dispatch).toHaveBeenCalledTimes(0)
   })
 
+  test('does not throw when attempting to abort a canceled promise', async () => {
+    const asyncPayloadCreator = jest.fn(async (x: typeof arg) => {
+      await new Promise(resolve => setTimeout(resolve, 2000))
+      return 10
+    })
+
+    const asyncThunk = createAsyncThunk('test', asyncPayloadCreator, {
+      condition
+    })
+    const promise = asyncThunk(arg)(dispatch, getState, extra)
+    promise.abort(
+      `If we didn't abortedPromise.catch(), this would crash the tests`
+    )
+  })
+
   test('rejected action can be dispatched via option', async () => {
     const asyncThunk = createAsyncThunk('test', payloadCreator, {
       condition,

src/createAsyncThunk.ts

@@ -339,6 +339,7 @@ If you want to use the AbortController to react to \`abort\` events, please cons
             options.condition &&
             options.condition(arg, { getState, extra }) === false
           ) {
+            abortedPromise.catch(() => {})
             throw {
               name: 'ConditionError',
               message: 'Aborted due to condition callback returning false.'