fix: Implicit 'index' was written to output filename for imports (fixes #105)

Author: nonara

src/utils/resolve-path-update-node.ts

@@ -108,9 +108,18 @@ export function resolvePathAndUpdateNode(
       filePath = tsInstance.normalizePath(path.join(path.relative(sourceFileDir, moduleDir), path.basename(filePath)));
     }
 
-    // Remove extension if implicit
-    if (extension && implicitExtensions.includes(extension))
-      filePath = filePath.slice(0, -extension.length) + maybeGetExplicitExtension(filePath, extension);
+    /* Fixup filename */
+    if (extension) {
+      const isImplicitIndex =
+        path.basename(filePath, extension) === 'index' &&
+        path.basename(moduleName, path.extname(moduleName)) !== 'index';
+
+      // Remove implicit index
+      if (isImplicitIndex) filePath = path.dirname(filePath);
+      // Remove implicit extension
+      else if (implicitExtensions.includes(extension))
+        filePath = filePath.slice(0, -extension.length) + maybeGetExplicitExtension(filePath, extension);
+    }
 
     return filePath[0] === "." || isURL(filePath) ? filePath : `./${filePath}`;
   }

test/projects/specific/src/index.ts

@@ -23,3 +23,5 @@ export { GeneralConstA, GeneralTypeA } from "#root/general";
 export { GeneralConstB } from "#root/general.js";
 
 export const b = 3;
+
+export { ConstB } from '#elision'

test/projects/specific/tsconfig.json

@@ -15,7 +15,9 @@
     "baseUrl": ".",
     "paths": {
       "#root/*": [ "./src/*", "./generated/*" ],
-      "#exclusion/*": [ "./src/excluded/*" ]
+      "#exclusion/*": [ "./src/excluded/*" ],
+      "#elision": [ "./src/type-elision" ],
+      "#elision/*": [ "./src/type-elision/*" ]
     },
     "resolveJsonModule": true
   }

test/tests/transformer/specific.test.ts

@@ -143,5 +143,10 @@ describe(`Transformer -> Specific Cases`, () => {
       expect(normalEmit[indexFile].dts).toMatch(`export { GeneralConstA, GeneralTypeA } from "./general";`);
       expect(normalEmit[indexFile].dts).toMatch(`export { GeneralConstB } from "./general.js";`);
     });
+
+    test(`Does not output implicit index filenames`, () => {
+      expect(normalEmit[indexFile].js).toMatch(`export { ConstB } from "./type-elision"`);
+      expect(normalEmit[indexFile].dts).toMatch(`export { ConstB } from "./type-elision"`);
+    });
   });
 });