Fix auto-suggestion issue for I actor when no helpers configured

When no helpers are configured, the Methods interface was not being generated,
causing TypeScript to fail resolving the type referenced in interface I.
This broke auto-completion for the I actor methods.

The fix ensures that the Methods interface is always generated, even when
empty, so that 'interface I extends WithTranslation<Methods>' always
references a valid type.

Co-authored-by: kobenguyent <[email protected]>

Author: Copilot

lib/command/definitions.js

@@ -41,7 +41,7 @@ const getDefinitionsFileContent = ({ hasCustomHelper, hasCustomStepsFile, helper
 
   const importPathsFragment = importPaths.join('\n')
   const supportObjectsTypeFragment = convertMapToType(supportObject)
-  const methodsTypeFragment = helperNames.length > 0 ? `interface Methods extends ${helperNames.join(', ')} {}` : ''
+  const methodsTypeFragment = helperNames.length > 0 ? `interface Methods extends ${helperNames.join(', ')} {}` : 'interface Methods {}'
   const translatedActionsFragment = JSON.stringify(translations.vocabulary.actions, null, 2)
 
   return generateDefinitionsContent({

test/data/sandbox/configs/custom-helper-esm/steps.d.ts

@@ -0,0 +1,11 @@
+/// <reference types='codeceptjs' />
+type MyHelper = InstanceType<typeof import('./myhelper_helper.js').default>;
+
+declare namespace CodeceptJS {
+  interface SupportObject { I: I, current: any }
+  interface Methods extends FileSystem, MyHelper {}
+  interface I extends WithTranslation<Methods> {}
+  namespace Translation {
+    interface Actions {}
+  }
+}

test/data/sandbox/configs/definitions/codecept.no-helpers.js

@@ -0,0 +1,10 @@
+export const config = {
+  tests: './*_test.js',
+  timeout: 10000,
+  output: './output',
+  helpers: {},
+  include: {},
+  bootstrap: false,
+  mocha: {},
+  name: 'sandbox-no-helpers',
+};

test/runner/definitions_test.js

@@ -283,6 +283,22 @@ describe('Definitions', function () {
       done()
     })
   })
+
+  it('def should create definition file with empty Methods interface when no helpers configured', done => {
+    exec(`${runner} def --config ${codecept_dir}/codecept.no-helpers.js`, (err, stdout) => {
+      stdout.should.include('Definitions were generated in steps.d.ts')
+      const types = typesFrom(`${codecept_dir}/steps.d.ts`)
+      types.should.be.valid
+
+      const definitionFile = types.getSourceFileOrThrow(`${codecept_dir}/steps.d.ts`)
+      const fileContent = definitionFile.getFullText()
+      fileContent.should.include('interface Methods {}')
+      fileContent.should.include('interface I extends WithTranslation<Methods>')
+      
+      assert(!err)
+      done()
+    })
+  })
 })
 
 /**