squash: fixing

Author: nonara

src/transformer.ts

@@ -43,9 +43,17 @@ function getTsProperties(args: Parameters<typeof transformer>) {
   }
   // RunMode: TsNode
   else if (maybeIsTsNode) {
-    runMode = RunMode.TsNode;
     fileNames = tsNodeProps.fileNames;
-    compilerOptions = tsNodeProps.compilerOptions;
+
+    runMode =
+      !program || (fileNames.length > 1 && program.getRootFileNames().length === 1)
+        ? RunMode.TsNodeTranspileOnly
+        : RunMode.TsNode;
+
+    compilerOptions = {
+      ...(program?.getCompilerOptions() ?? {}),
+      ...tsNodeProps!.compilerOptions
+    };
   } else {
     throw new Error(
       `Cannot transform without a Program, ts-node instance, or manual parameters supplied. ` +
@@ -89,7 +97,7 @@ export default function transformer(
 
     /* Add supplements for various run modes */
     let emitHost = transformationContext.getEmitHost();
-    if (!emitHost) {
+    if (!emitHost || runMode === RunMode.TsNodeTranspileOnly) {
       if (!fileNames)
         throw new Error(
           `No EmitHost found and could not determine files to be processed. Please file an issue with a reproduction!`

src/types.ts

@@ -64,8 +64,9 @@ export interface VisitorContext extends TsTransformPathsContext {
 
 export enum RunMode {
   TsNode = "ts-node",
+  TsNodeTranspileOnly = "ts-node-transpile-only",
   Manual = "manual",
-  Program = "program",
+  Program = "program"
 }
 
 // endregion