import/export issue of angularjs constants

Question

I am using common js module system in my angularjs 1.x application and struggling with importing/exporting constants. This is what I have.

index.js

'use strict';
var angular = require('angular');    
module.exports = angular.module('constants', [])
    .constant('constant1', require('./constant1'))
     .constant('constant2', require('./constant2'))
    .constant('constant3', require('./constant3'))

constant1.js

'use strict';
 var SAMPLE1 =  { 'TEST1' : 100 , 'Test2': 200 }
 var SAMPLE2 =  300;
module.exports = SAMPLE1 ;
module.exports = SAMPLE2 ;

constant2.js

 'use strict';
      var SAMPLE3 =  { 'TEST3' : 400 , 'Test4': 500 }
      var SAMPLE4 =  600;
module.exports = SAMPLE3 ;
module.exports = SAMPLE4 ;

constant3.js

 'use strict';
      var SAMPLE5 =  { 'TEST5' : 700 , 'Test6': 800 }
      var SAMPLE6 =  900;
module.exports = SAMPLE5 ;
module.exports = SAMPLE6 ;

app.module.js

'use strict';
var angular = require('angular');
var myApp = angular.module('myApp', [
    require('./common/services').name,
    require('./components/constants').name
]);

I am getting this error while running the application

Error: $injector:unpr

Unknown provider: KEYProvider <- SAMPLE1 <- MyService

Answer 1

It says you have an error in declaration of injections of your service MyService. If you want to export multiple variables you have to write module.exports.var1 = var1; module.exports.var2 = var2 (or exports.var1 = var1; exports.var2 = var2) and not just module.exports = var1; module.exports = var2, because the second assignment simply overrides the first one. Later you use var1 = require('./file').var1 to import var1 and var2 = require('./file').var2 to import var2