antlr4: TypeScript missing critical class definition exports

I was trying to write a template for TypeScript for testing the new target on grammars-v4. There is (are) important classes that need to be exported. Otherwise, I am blocked, and there will be no testing of the target in grammars-v4 because the trgen templates require a consistent runtime API in order to provide consistent functionality across targets.

• Recognizer missing in export list. https://github.com/antlr/antlr4/blob/c2bfa34a66e6449ff6fb2e388e17e2ff4b7e8e82/runtime/JavaScript/src/antlr4/index.d.ts#L10
• List not sorted alphabetically for quick lookup for missing exports. https://github.com/antlr/antlr4/blob/c2bfa34a66e6449ff6fb2e388e17e2ff4b7e8e82/runtime/JavaScript/src/antlr4/index.d.ts#L1
• TokenSource missing export.
• CommonToken missing TypeScript wrapper declaration and export.

I don’t know why certain classes do not have corresponding TypeScript export class definition files. It should be identical to the list of exported symbols in Java.