I am watching a video tutorial and I have created a a new typescript project.
First I created in the root directory the following namespace (utilityFunctions.ts) :

namespace Utility {



    export namespace Fees {

        export function CalculateLateFee(daysLate: number): number {

            return daysLate * .25;

        }

    }



    export function MaxBooksAllowed(age: number): number {

        if (age < 12){

            return 3;

        }

        else {

            return 10;

        }

    }



    //function that is not exported

    //use it only inside the namespace

    function privateFunc(): void {

        console.log('This is private...');

    }



}

Then I created another typescript file (app.ts) to use the above namespace code :

/// <reference path=utilityFunctions.ts />





let fee: number = Utility.Fees.CalculateLateFee(10);

console.log(`Fee: ${fee}`);

When I run the app.js file (using webstorm latest version) I am getting the following error :

/Users/Administrator/.nvm/versions/node/v6.5.0/bin/node /Users/Administrator/WebstormProjects/NamespaceDemo/app.js

/Users/Administrator/WebstormProjects/NamespaceDemo/app.js:5

var fee = Utility.Fees.CalculateLateFee(10);

                       ^



ReferenceError: Utility is not defined

    at Object.<anonymous> (/Users/Administrator/WebstormProjects/NamespaceDemo/app.js:5:24)

    at Module._compile (module.js:556:32)

    at Object.Module._extensions..js (module.js:565:10)

    at Module.load (module.js:473:32)

    at tryModuleLoad (module.js:432:12)

    at Function.Module._load (module.js:424:3)

    at Module.runMain (module.js:590:10)

    at run (bootstrap_node.js:394:7)

    at startup (bootstrap_node.js:149:9)

    at bootstrap_node.js:509:3



Process finished with exit code 1

My tsconfig.json file is the following :

{

    compilerOptions: {

        module: commonjs,

        target: es5,

        noImplicitAny: false,

        sourceMap: true

    },

    exclude: [

        node_modules

    ]

}

And my tslint.json file is the following (although I don't think that the linter has anything to do with compilation errors):

{

    extends: tslint:recommended,



    rules: {

        comment-format: [false, check-space],

        eofline: false,

        triple-equals: [false, allow-null-check],

        no-trailing-whitespace: false,

        one-line: false,

        no-empty: false,

        typedef-whitespace: false,

        whitespace: false,

        radix: false,

        no-consecutive-blank-lines: false,

        no-console: false,

        typedef: [true,

            variable-declaration,

            call-signature,

            parameter,

            property-declaration,

            member-variable-declaration

        ],

        quotemark: false,

        one-variable-per-declaration: false,

        max-line-length: 160,

        object-literal-sort-keys: false,

        trailing-comma: false,

        variable-name: [true,

            ban-keywords,

            check-format,

            allow-leading-underscore

        ]

    }



}