Incorrect configuration file for karma

To simplify the configuration of the karma config file, I have utilized variables to store specific parts of the path.

var publicfolder = "public"
var mypath = "packages/vendor/package/";

files: [
  publicfolder+'/assets/libs/jquery/dist/jquery.js',
  publicfolder+'/assets/libs/angular/angular.js',
  publicfolder+'/assets/libs/**/*.js',
  publicfolder+'/app/**/*.js',
  mypath +'/public/app/**/*.test.js',
  mypath +'/public/app/**/*.html'
],

preprocessors: {
    mypath +'/public/app/**/*.html':['ng-html2js']
},

However, during testing, an error occurred:

E:\www\project\karma.conf.js:83
    mypath +'/public/app/**/*.html':['ng-html2js']
           ^
ERROR [config]: Invalid config file!
  SyntaxError: Unexpected token +
    at Module._compile (module.js:439:25)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)

My question is WHY? Why am I unable to use a variable in one place but not in another within the configuration?

javascriptunit-testingkarma-runner

Answer №1

preprocessors is a type of object where you cannot use expressions as keys in initializer notation. However, if you want to use expressions when setting a key, you can utilize square bracket notation instead.

For example:

var mypath = "packages/vendor/package/";
var preprocessors = {};
preprocessors[mypath +'/public/app/**/*.html'] = ['ng-html2js'];

It's important to note that using expressions within the files array is acceptable because you are simply creating regular strings, not defining object keys.

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