fix return type of step hook function to allow async (#2038)

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 Please see [CONTRIBUTING.md](https://github.com/cucumber/cucumber/blob/master/CONTRIBUTING.md) on how to contribute to Cucumber.
 
 ## [Unreleased]
+### Fixed
+- Fix return type of step hook function to allow async functions ([#2038](https://github.com/cucumber/cucumber-js/pull/2038))
 
 ## [8.2.0] - 2022-05-05
 ### Changed

features/support/hooks.ts

@@ -1,11 +1,10 @@
-import { After, Before, formatterHelpers } from '../../'
+import { After, Before, formatterHelpers, ITestCaseHookParameter } from '../../'
 import fs from 'fs'
 import fsExtra from 'fs-extra'
 import path from 'path'
 import tmp from 'tmp'
 import { doesHaveValue } from '../../src/value_checker'
 import { World } from './world'
-import { ITestCaseHookParameter } from '../../src/support_code_library_builder/types'
 import { warnUserAboutEnablingDeveloperMode } from './warn_user_about_enabling_developer_mode'
 
 const projectPath = path.join(__dirname, '..', '..')

src/support_code_library_builder/types.ts

@@ -35,7 +35,7 @@ export type TestCaseHookFunction<WorldType> = (
 export type TestStepHookFunction<WorldType> = (
   this: WorldType,
   arg: ITestStepHookParameter
-) => void
+) => any | Promise<any>
 
 export type TestStepFunction<WorldType> = (
   this: WorldType,

test-d/hooks.ts

@@ -17,6 +17,14 @@ After(function () {})
 BeforeStep(function () {})
 AfterStep(function () {})
 
+// should allow hook functions to be async
+BeforeAll(async function () {})
+AfterAll(async function () {})
+Before(async function () {})
+After(async function () {})
+BeforeStep(async function () {})
+AfterStep(async function () {})
+
 // should allow typed arguments in hooks
 Before(function (param: ITestCaseHookParameter) {})
 After(function (param: ITestCaseHookParameter) {})