feat(json): log the filename when JSON.parse fails

Helpful when debugging
Sometimes in a large codebase, a single comma buried in a gigantic json file can halt the entire build. This change ensures that users will more easily be able to find and fix those errors.

packages/json/src/index.js

@@ -11,15 +11,21 @@ export default function json(options = {}) {
     transform(json, id) {
       if (id.slice(-5) !== '.json' || !filter(id)) return null;
 
-      return {
-        code: dataToEsm(JSON.parse(json), {
-          preferConst: options.preferConst,
-          compact: options.compact,
-          namedExports: options.namedExports,
-          indent
-        }),
-        map: { mappings: '' }
-      };
+      try {
+        return {
+          code: dataToEsm(JSON.parse(json), {
+            preferConst: options.preferConst,
+            compact: options.compact,
+            namedExports: options.namedExports,
+            indent
+          }),
+          map: { mappings: '' }
+        };
+      } catch (err) {
+        const error = new Error(`Could not parse ${id}`);
+        error.originalError = err;
+        throw error;
+      }
     }
   };
 }

packages/json/test/test.js

@@ -80,7 +80,7 @@ test('handles garbage', async (t) => {
     });
 
   const error = await t.throwsAsync(bundle);
-  t.is(error.message.indexOf('Unexpected token o'), 0);
+  t.regex(error.message, /Could not parse (.*)bad.json$/);
 });
 
 test('does not generate an AST', async (t) => {