Force dts emit (microsoft#3084)

Author: jakebailey

packages/sandbox/src/index.ts

@@ -296,10 +296,13 @@ export const createTypeScriptSandbox = (
   }
 
   /** Gets the results of compiling your editor's code */
-  const getEmitResult = async () => {
+  const getEmitResult = async (
+    emitOnlyDtsFiles?: boolean,
+    forceDtsEmit?: boolean
+  ) => {
     const model = editor.getModel()!
     const client = await getWorkerProcess()
-    return await client.getEmitOutput(model.uri.toString())
+    return await client.getEmitOutput(model.uri.toString(), emitOnlyDtsFiles, forceDtsEmit)
   }
 
   /** Gets the JS  of compiling your editor's code */
@@ -318,7 +321,7 @@ export const createTypeScriptSandbox = (
 
   /** Gets the DTS for the JS/TS  of compiling your editor's code */
   const getDTSForCode = async () => {
-    const result = await getEmitResult()
+    const result = await getEmitResult(/*emitOnlyDtsFiles*/ undefined, /*forceDtsEmit*/ true)
     return result.outputFiles.find((o: any) => o.name.endsWith(".d.ts"))?.text || ""
   }
 

packages/sandbox/src/tsWorker.ts

@@ -53,7 +53,7 @@ export declare class TypeScriptWorker implements ts.LanguageServiceHost {
     providePrefixAndSuffixTextForRename: boolean
   ): Promise<readonly ts.RenameLocation[] | undefined>
   getRenameInfo(fileName: string, position: number, options: ts.RenameInfoOptions): Promise<ts.RenameInfo>
-  getEmitOutput(fileName: string): Promise<ts.EmitOutput>
+  getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean, forceDtsEmit?: boolean): Promise<ts.EmitOutput>
   getCodeFixesAtPosition(
     fileName: string,
     start: number,