Fix auto imports in JS files in nodenext (#54817)

Author: andrewbranch

src/services/codefixes/importFixes.ts

@@ -803,14 +803,19 @@ function shouldUseRequire(sourceFile: SourceFile, program: Program): boolean {
         return getEmitModuleKind(compilerOptions) < ModuleKind.ES2015;
     }
 
-    // 4. Match the first other JS file in the program that's unambiguously CJS or ESM
+    // 4. In --module nodenext, assume we're not emitting JS -> JS, so use
+    //    whatever syntax Node expects based on the detected module kind
+    if (sourceFile.impliedNodeFormat === ModuleKind.CommonJS) return true;
+    if (sourceFile.impliedNodeFormat === ModuleKind.ESNext) return false;
+
+    // 5. Match the first other JS file in the program that's unambiguously CJS or ESM
     for (const otherFile of program.getSourceFiles()) {
         if (otherFile === sourceFile || !isSourceFileJS(otherFile) || program.isSourceFileFromExternalLibrary(otherFile)) continue;
         if (otherFile.commonJsModuleIndicator && !otherFile.externalModuleIndicator) return true;
         if (otherFile.externalModuleIndicator && !otherFile.commonJsModuleIndicator) return false;
     }
 
-    // 5. Literally nothing to go on
+    // 6. Literally nothing to go on
     return true;
 }
 

tests/cases/fourslash/autoImportNodeNextJSRequire.ts

@@ -0,0 +1,25 @@
+/// <reference path='fourslash.ts' />
+
+// @module: nodenext
+// @allowJs: true
+// @checkJs: true
+// @noEmit: true
+
+// @Filename: /matrix.js
+//// exports.variants = [];
+
+// @Filename: /main.js
+//// exports.dedupeLines = data => {
+////   variants/**/
+//// }
+
+// @Filename: /totally-irrelevant-no-way-this-changes-things-right.js
+//// export default 0;
+
+goTo.file("/main.js");
+verify.importFixAtPosition([
+`const { variants } = require("./matrix")
+
+exports.dedupeLines = data => {
+  variants
+}`]);