fix(pg): emit query error even when callback is present

packages/pg/lib/query.js

@@ -125,12 +125,10 @@ class Query extends EventEmitter {
       err = this._canceledDueToError
       this._canceledDueToError = false
     }
-    // if callback supplied do not emit error event as uncaught error
-    // events will bubble up to node process
-    if (this.callback) {
-      return this.callback(err)
+    if (this.listenerCount('error') > 0) {
+      this.emit('error', err)
     }
-    this.emit('error', err)
+    if (this.callback) return this.callback(err)
   }
 
   handleReadyForQuery(con) {

packages/pg/test/unit/client/query-timeout-tests.js

@@ -32,3 +32,23 @@ test('query timeout with Submittable with callback delivers error via callback',
     done()
   })
 })
+
+test('handleError emits error even when callback is present', function (done) {
+  const query = new Query({ text: 'SELECT 1' })
+  const err = new Error('boom')
+  let emitted = false
+  let called = false
+
+  query.on('error', (emittedErr) => {
+    assert.equal(emittedErr, err)
+    emitted = true
+    if (called) done()
+  })
+  query.callback = (callbackErr) => {
+    assert.equal(callbackErr, err)
+    called = true
+    if (emitted) done()
+  }
+
+  query.handleError(err)
+})