feat(build): add vars parameter to transformer function.

packages/build/src/build/buildRefs.js

@@ -140,17 +140,21 @@ class RefBuilder {
           `Invalid _ref definition ${JSON.stringify(refDef.original)} at file ${path}`
         );
       }
+      const parsedVars = JSON.parse(
+        JSON.stringify(refDef.vars),
+        refReviver.bind({ parsedFiles, vars })
+      );
       // eslint-disable-next-line no-await-in-loop
       let parsedFile = await this.recursiveParseFile({
         path: refDef.path,
         // Parse vars before passing down to parse new file
-        vars: JSON.parse(JSON.stringify(refDef.vars), refReviver.bind({ parsedFiles, vars })),
+        vars: parsedVars,
         count: count + 1,
       });
       if (refDef.transformer) {
         const transformerFile = await readFile(nodePath.resolve(process.cwd(), refDef.transformer));
         const transformerFn = eval(transformerFile);
-        parsedFile = transformerFn(parsedFile);
+        parsedFile = transformerFn(parsedFile, parsedVars);
       }
       parsedFiles[refDef.id] = parsedFile;
     }

packages/build/src/build/buildRefs.test.js

@@ -682,6 +682,9 @@ test('buildRefs with transformer function', async () => {
         _ref: {
           path: 'target.yaml',
           transformer: 'src/test/testBuildRefsTransform.js',
+          vars: {
+            var1: 'var1',
+          },
         },
       },
     },
@@ -697,5 +700,6 @@ test('buildRefs with transformer function', async () => {
   expect(res).toEqual({
     add: 43,
     json: '{"a":1}',
+    var: 'var1',
   });
 });

packages/build/src/test/testBuildRefsTransform.js

@@ -2,10 +2,11 @@ function add(a, b) {
   return a + b;
 }
 
-function transformer(obj) {
+function transformer(obj, vars) {
   return {
     json: JSON.stringify(obj),
     add: add(obj.a, 42),
+    var: vars.var1,
   };
 }