fix(typescript-checker): support prerelease TypeScript versions (#4738)

packages/typescript-checker/src/tsconfig-helpers.ts

@@ -28,7 +28,7 @@ const LOW_EMIT_OPTIONS_FOR_PROJECT_REFERENCES: Readonly<Partial<ts.CompilerOptio
 });
 
 export function guardTSVersion(version = ts.version): void {
-  if (!semver.satisfies(version, '>=3.6')) {
+  if (!semver.satisfies(version, '>=3.6', { includePrerelease: true })) {
     throw new Error(`@stryker-mutator/typescript-checker only supports [email protected] or higher. Found typescript@${version}`);
   }
 }

packages/typescript-checker/test/unit/typescript-helpers.spec.ts

@@ -200,12 +200,20 @@ describe('typescript-helpers', () => {
         '@stryker-mutator/typescript-checker only supports [email protected] or higher. Found [email protected]',
       );
     });
+    it('should throw if [email protected]', () => {
+      expect(guardTSVersion.bind(undefined, '3.5.0-beta')).throws(
+        '@stryker-mutator/typescript-checker only supports [email protected] or higher. Found [email protected]',
+      );
+    });
     it('should not throw if [email protected]', () => {
       expect(guardTSVersion.bind(undefined, '3.6.0')).not.throws();
     });
     it('should not throw if [email protected]', () => {
       expect(guardTSVersion.bind(undefined, '4.0.0')).not.throws();
     });
+    it('should not throw if [email protected]', () => {
+      expect(guardTSVersion.bind(undefined, '5.4.0-beta')).not.throws();
+    });
   });
 
   describe(getSourceMappingURL.name, () => {