fix: Add missing error message when req.continue is used incorrectly

cli/CHANGELOG.md

@@ -13,6 +13,7 @@ _Released 03/1/2023 (PENDING)_
 - Added missing TypeScript type definitions for the [`cy.reload()`](https://docs.cypress.io/api/commands/reload) command. Addressed in [#25779](https://github.com/cypress-io/cypress/pull/25779).
 - Ensure Angular components are mounted inside the correct element. Fixes [#24385](https://github.com/cypress-io/cypress/issues/24385)
 - Fix a bug where files outside the project root in a monorepo are not correctly served when using Vite. Addressed in [#25801](https://github.com/cypress-io/cypress/pull/25801)
+- Fixed an issue where using [`cy.intercept`](https://docs.cypress.io/api/commands/intercept)'s `req.continue()` with a non-function parameter would not provide an appropriate error message. Fixed in [#25884](https://github.com/cypress-io/cypress/pull/25884).
 
 **Misc:**
 

packages/driver/cypress/e2e/commands/net_stubbing.cy.ts

@@ -2496,6 +2496,30 @@ describe('network stubbing', { retries: 15 }, function () {
         }).visit('/dump-method')
       })
 
+      it('fails test if both req.reply and req.continue are called in req handler', function (done) {
+        testFail((err) => {
+          expect(err.message).to.contain('`req.reply()` and/or `req.continue()` were called to signal request completion multiple times, but a request can only be completed once')
+          done()
+        })
+
+        cy.intercept('/dump-method', function (req) {
+          req.reply()
+
+          req.continue()
+        }).visit('/dump-method')
+      })
+
+      it('fails test if req.continue is called with a non-function parameter', function (done) {
+        testFail((err) => {
+          expect(err.message).to.contain('\`req.continue\` requires the parameter to be a function')
+          done()
+        })
+
+        cy.intercept('/dump-method', function (req) {
+          req.continue({} as any)
+        }).visit('/dump-method')
+      })
+
       it('fails test if req.reply is called after req handler finishes', function (done) {
         testFail((err) => {
           expect(err.message).to.contain('> `req.reply()` was called after the request handler finished executing')

packages/driver/src/cypress/error_messages.ts

@@ -1135,6 +1135,7 @@ export default {
 
           You passed: ${format(eventName)}`, 10)
       },
+      req_continue_fn_only: '\`req.continue\` requires the parameter to be a function',
       event_needs_handler: `\`req.on()\` requires the second parameter to be a function.`,
       defineproperty_is_not_allowed: `\`defineProperty()\` is not allowed.`,
       setprototypeof_is_not_allowed: `\`setPrototypeOf()\` is not allowed.`,