Got the tests and code working for supporting non-file documenting

Author: batje

__tests__/test.js

@@ -262,7 +262,9 @@ export default {
     }
   }
 }`;
-  const data = await documentation.build([{ source: documentationSource }], {});
+  const data = await documentation.build([{ source: documentationSource }], {
+    shallow: true
+  });
   normalize(data);
   expect(data).toMatchSnapshot();
 });

src/index.js

@@ -105,10 +105,11 @@ function buildInternal(inputsAndConfig) {
       sourceFile.source = fs.readFileSync(sourceFile.file, 'utf8');
     }
 
-    if (
-      typeof sourceFile.file === 'string' &&
-      path.extname(sourceFile.file) === '.vue'
-    ) {
+    if (!sourceFile.file) {
+      sourceFile.file = '';
+    }
+
+    if (path.extname(sourceFile.file) === '.vue') {
       return parseVueScript(sourceFile, config).map(buildPipeline);
     }
     return parseJavaScript(sourceFile, config).map(buildPipeline);