update

.eslintrc

@@ -8,6 +8,6 @@
   },
   "parser": "babel-eslint",
   "globals": {
-        "Buffer": true
+        "OperationBuffer": true
     }
 }

.flowconfig

 [ignore]
-./build_node
-./build
 ./build_test
-./y.js
 
 [include]
 ./src

src/Buffer.js → src/OperationBuffer.js

 /* @flow */
-/* global Buffer */
 
-class Buffer { //eslint-disable-line no-unused-vars
+class OperationBuffer { //eslint-disable-line no-unused-vars
   i : number;
   constructor () {
     this.i = 4;
   }
 }
-
-
-function add(x : string){
-  return x + 4;
-}
-
-
-add("5");
-add("6");

src/OperationBuffer.spec.js

+/* @flow */
+/*eslint-env browser,jasmine,console */
+
+describe("Operation Buffer", function() {
+  var OB = new OperationBuffer(void 0);
+
+  it("contains spec with an expectation", function(done) {
+    setTimeout(function(){
+      done();
+    }, 1000);
+    expect(OB.i).toBe(4);
+  });
+});

src/y.js

 /* @flow */
-/* global Buffer */
-
-export default Buffer;

y.js

-"use strict";function _classCallCheck(n,t){if(!(n instanceof t))throw new TypeError("Cannot call a class as a function")}function add(n){return n+4}var Buffer=function n(){_classCallCheck(this,n),this.i=4};add("5"),add("6"),describe("A suite",function(){it("contains spec with an expectation",function(){expect(!0).toBe(!0)})});
+"use strict";function _classCallCheck(n,e){if(!(n instanceof e))throw new TypeError("Cannot call a class as a function")}var OperationBuffer=function n(){_classCallCheck(this,n),this.i=4};describe("Operation Buffer",function(){var n=new OperationBuffer(void 0);window.console.log(n),it("contains spec with an expectation",function(n){setTimeout(function(){n()},1e3),expect(!0).toBe(!0)})});
 //# sourceMappingURL=y.js.map
\ No newline at end of file

y.js.map

-{"version":3,"sources":["y.js","Buffer.js","Buffer.spec.js"],"names":["_classCallCheck","instance","Constructor","TypeError","add","x","Buffer","this","i","describe","it","expect","toBe"],"mappings":"AAGA,YAEA,SAASA,iBAAgBC,EAAUC,GAAe,KAAMD,YAAoBC,IAAgB,KAAM,IAAIC,WAAU,qCCMhH,QAAAC,KAAAC,GACA,MAAAA,GAAA,EDLA,GCJAC,QAEA,QAFAA,KDKEN,gBAAgBO,KCLlBD,GAGAC,KAAAC,EAAA,EAUAJ,KAAA,KACAA,IAAA,KCdAK,SAAA,UAAA,WACAC,GAAA,oCAAA,WACAC,QAAA,GAAAC,MAAA","file":"y.js","sourcesContent":["/* @flow */\n/* global Buffer */\n\nexport default Buffer;\n","/* @flow */\n/* global Buffer */\n\nclass Buffer { //eslint-disable-line no-unused-vars\n  i : number;\n  constructor () {\n    this.i = 4;\n  }\n}\n\n\nfunction add(x : string){\n  return x + 4;\n}\n\n\nadd(\"5\");\nadd(\"6\");\n","/* @flow */\n/*eslint-env jasmine */\n\ndescribe(\"A suite\", function() {\n  it(\"contains spec with an expectation\", function() {\n    expect(true).toBe(true);\n  });\n});\n"],"sourceRoot":"/source/"}
+{"version":3,"sources":["y.js","OperationBuffer.js","OperationBuffer.spec.js"],"names":["_classCallCheck","instance","Constructor","TypeError","OperationBuffer","this","i","describe","OB","window","console","log","it","done","setTimeout","expect","toBe"],"mappings":"AAEA,YAEA,SAASA,iBAAgBC,EAAUC,GAAe,KAAMD,YAAoBC,IAAgB,KAAM,IAAIC,WAAU,qCAEhH,GCJAC,iBAEA,QAFAA,KDKEJ,gBAAgBK,KCLlBD,GAGAC,KAAAC,EAAA,ECFAC,UAAA,mBAAA,WACA,GAAAC,GAAA,GAAAJ,iBAAA,OACAK,QAAAC,QAAAC,IAAAH,GAEAI,GAAA,oCAAA,SAAAC,GACAC,WAAA,WACAD,KACA,KACAE,QAAA,GAAAC,MAAA","file":"y.js","sourcesContent":["/* @flow */\n","/* @flow */\n\nclass OperationBuffer { //eslint-disable-line no-unused-vars\n  i : number;\n  constructor () {\n    this.i = 4;\n  }\n}\n","/* @flow */\n/*eslint-env browser,jasmine */\n\ndescribe(\"Operation Buffer\", function() {\n  var OB = new OperationBuffer(void 0);\n  window.console.log(OB);\n\n  it(\"contains spec with an expectation\", function(done) {\n    setTimeout(function(){\n      done();\n    }, 1000);\n    expect(true).toBe(true);\n  });\n});\n"],"sourceRoot":"/source/"}
\ No newline at end of file