exporting value-checker utility functions

Many of the internal libraries use these utility functions. In case
users want to customize code, they may want to reuse some parts of the
original implementation, and as such, they would need these functions.

More details: cucumber#2290

Signed-off-by: Antal Nemes <antal.nemes.hu@gmail.com>

CHANGELOG.md

@@ -9,6 +9,7 @@ Please see [CONTRIBUTING.md](./CONTRIBUTING.md) on how to contribute to Cucumber
 
 ## [Unreleased]
 ### Added
+- value-checker utility functions gets exported ([#2290](https://github.com/cucumber/cucumber-js/issues/2290))
 - New option for JUnit test suite name to be passed in `formatOptions` ([#2265](https://github.com/cucumber/cucumber-js/issues/2265))
 - Logging and calculation is decoupled in `logFailedTestCases()` for easier customization ([#2290](https://github.com/cucumber/cucumber-js/issues/2290))
 

src/index.ts

@@ -89,3 +89,9 @@ export const Runtime = deprecate(
   '`Runtime` is deprecated, use `runCucumber` instead; see https://github.com/cucumber/cucumber-js/blob/main/docs/deprecations.md'
 )
 export { INewRuntimeOptions, IRuntimeOptions } from './runtime'
+
+export {
+  doesHaveValue,
+  doesNotHaveValue,
+  valueOrDefault,
+} from './value_checker'