fix(providence): correctly handle exports like "const x=3; export {x};"

Co-authored-by: Thijs Louisse<Thijs.Louisse@ing.com>

.changeset/brown-dodos-own.md

@@ -0,0 +1,5 @@
+---
+'providence-analytics': patch
+---
+
+correctly handle exports like "const x=3; export {x};"

packages-node/providence-analytics/src/program/analyzers/helpers/track-down-identifier.js

@@ -37,7 +37,7 @@ function getBindingAndSourceReexports(astPath, identifierName) {
       if (found) {
         bindingPath = path;
         bindingType = 'ExportSpecifier';
-        source = path.parentPath.node.source.value;
+        source = path.parentPath.node.source ? path.parentPath.node.source.value : '[current]';
         path.stop();
       }
     },
@@ -46,11 +46,14 @@ function getBindingAndSourceReexports(astPath, identifierName) {
 }
 
 /**
- * @desc returns source and importedIdentifierName: We might be an import that was locally renamed.
+ * Retrieves source (like '@lion/core') and importedIdentifierName (like 'lit') from ast for
+ * current file.
+ * We might be an import that was locally renamed.
  * Since we are traversing, we are interested in the imported name. Or in case of a re-export,
  * the local name.
  * @param {object} astPath Babel ast traversal path
  * @param {string} identifierName the name that should be tracked (and that exists inside scope of astPath)
+ * @returns {{ source:string, importedIdentifierName:string }}
  */
 function getImportSourceFromAst(astPath, identifierName) {
   let source;
@@ -183,7 +186,8 @@ async function trackDownIdentifierFn(source, identifierName, currentFilePath, ro
                * export { x }
                */
               newSource = getImportSourceFromAst(path, identifierName).source;
-              if (!newSource) {
+
+              if (!newSource || newSource === '[current]') {
                 /**
                  * @example
                  * const x = 12;
@@ -222,7 +226,7 @@ async function trackDownIdentifierFn(source, identifierName, currentFilePath, ro
     rootFilePath = resObj.file;
     rootSpecifier = resObj.specifier;
   }
-  return /** @type {RootFile } */ { file: rootFilePath, specifier: rootSpecifier };
+  return /** @type { RootFile } */ { file: rootFilePath, specifier: rootSpecifier };
 }
 
 trackDownIdentifier = memoizeAsync(trackDownIdentifierFn);

packages-node/providence-analytics/test-node/program/analyzers/helpers/track-down-identifier.test.js

@@ -137,6 +137,37 @@ describe('trackdownIdentifier', () => {
     });
   });
 
+  it(`tracks down locally declared, reexported identifiers (without a source defined)`, async () => {
+    mockProject(
+      {
+        './src/declarationOfMyNumber.js': `
+        const myNumber = 3;
+
+        export { myNumber };
+      `,
+        './currentFile.js': `
+        import { myNumber } from './src/declarationOfMyNumber.js';
+      `,
+      },
+      {
+        projectName: 'my-project',
+        projectPath: '/my/project',
+      },
+    );
+
+    // Let's say we want to track down 'MyClass' in the code above
+    const source = './src/declarationOfMyNumber.js';
+    const identifierName = 'myNumber';
+    const currentFilePath = '/my/project/currentFile.js';
+    const rootPath = '/my/project';
+
+    const rootFile = await trackDownIdentifier(source, identifierName, currentFilePath, rootPath);
+    expect(rootFile).to.eql({
+      file: './src/declarationOfMyNumber.js',
+      specifier: 'myNumber',
+    });
+  });
+
   // TODO: improve perf
   describe.skip('Caching', () => {});
 });