API: make 'isExternalOrCommonJsModule' public

Suggestion

🔍 Search Terms

isExternalOrCommonJsModule, commonJsModuleIndicator

✅ Viability Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

⭐ Suggestion

Make the existing utility function ts.isExternalOrCommonJsModule public by moving it from utilities.ts to utilitiesPublic.ts

📃 Motivating Example

TypeScript treats commonJS modules similar to external modules. But currently there's no way for an API user to know whether TypeScript considers a file as commonJS module. SourceFile#commonJsModuleIndicator is not exposed in the public API and there's no ts.isCommonJsModule as pendant to ts.isExternalModule.

💻 Use Cases

My current use case is to determine whether a file (or top-level declaration inside of it) contributes to the global scope. Currently I can only handle external modules, which doesn't match what TypeScript does internally.

Inizia leggendo isExternalOrCommonJsModule in utilities.ts e le esportazioni pubbliche in utilitiesPublic.ts. Verifica come vengono esposte utilità pubbliche correlate come isExternalModule ed esegui i test pertinenti della Compiler API; il lavoro è completato quando l'utilità è disponibile pubblicamente senza modificare il comportamento di runtime esistente.