fix: do not throw when meeting empty source map file (#992)

* fix: do not throw when meeting empty source map file

* Fix lint issue

Co-authored-by: Justin Beckwith <[email protected]>
Co-authored-by: James McTavish <[email protected]>

Author: 3 people

src/agent/io/sourcemapper.ts

@@ -158,10 +158,6 @@ async function processSourcemap(
       return path.normalize(path.join(parentDir, relPath));
     });
 
-  if (normalizedSourcesRelToProc.length === 0) {
-    throw new Error('No sources listed in the sourcemap file ' + mapPath);
-  }
-
   for (const src of normalizedSourcesRelToProc) {
     const inputFile = path.normalize(src);
     infoMap.set(inputFile, {

test/fixtures/sourcemaps/empty-source-map.js.map

@@ -112,12 +112,16 @@ describe('Debuglet', () => {
       const config = extend({}, defaultConfig, {
         workingDirectory: SOURCEMAP_DIR,
       });
+
       const searchResults = await Debuglet.findFiles(config, 'fake-id');
       assert(searchResults.jsStats);
       assert.strictEqual(Object.keys(searchResults.jsStats).length, 1);
       assert(searchResults.jsStats[path.join(SOURCEMAP_DIR, 'js-file.js')]);
-      assert.strictEqual(searchResults.mapFiles.length, 1);
-      assert(searchResults.mapFiles[0].endsWith('js-map-file.js.map'));
+
+      assert.strictEqual(searchResults.mapFiles.length, 2);
+      const mapFiles = searchResults.mapFiles.sort();
+      assert(mapFiles[0].endsWith('empty-source-map.js.map'));
+      assert(mapFiles[1].endsWith('js-map-file.js.map'));
     });
   });