diff --git a/cli/types/index.d.ts b/cli/types/index.d.ts
index 6f8aa4629c84..7786c0c3a660 100644
--- a/cli/types/index.d.ts
+++ b/cli/types/index.d.ts
@@ -327,6 +327,12 @@ declare namespace Cypress {
      */
     on: Actions
 
+    /**
+     * These events come from Cypress as it issues commands and reacts to their state. These are all useful to listen to for debugging purposes.
+     * @see https://on.cypress.io/catalog-of-events#App-Events
+     */
+    once: Actions
+
     /**
      * These events come from Cypress as it issues commands and reacts to their state. These are all useful to listen to for debugging purposes.
      * @see https://on.cypress.io/catalog-of-events#App-Events
@@ -934,6 +940,12 @@ declare namespace Cypress {
      */
     on: Actions
 
+    /**
+     * These events come from Cypress as it issues commands and reacts to their state. These are all useful to listen to for debugging purposes.
+     * @see https://on.cypress.io/catalog-of-events#App-Events
+     */
+    once: Actions
+
     /**
      * These events come from Cypress as it issues commands and reacts to their state. These are all useful to listen to for debugging purposes.
      * @see https://on.cypress.io/catalog-of-events#App-Events
diff --git a/cli/types/tests/cypress-tests.ts b/cli/types/tests/cypress-tests.ts
index 13838bc77418..7b7ccb23eb09 100644
--- a/cli/types/tests/cypress-tests.ts
+++ b/cli/types/tests/cypress-tests.ts
@@ -246,6 +246,18 @@ namespace CypressOnTests {
   })
 }
 
+namespace CypressOnceTests {
+  Cypress.once('uncaught:exception', (error, runnable) => {
+    error // $ExpectType Error
+    runnable // $ExpectType IRunnable
+  })
+
+  cy.once('uncaught:exception', (error, runnable) => {
+    error // $ExpectType Error
+    runnable // $ExpectType IRunnable
+  })
+}
+
 namespace CypressOffTests {
   Cypress.off('uncaught:exception', (error, runnable) => {
     error // $ExpectType Error