Encountering a 404 error for .ts files: The mystery of the missing

Whenever I try to access a page on my live environment, an error appears:

GET http://example.com/Scripts/main.ts 404 (Not Found) error: (SystemJS) XHR error (404 Not Found) loading http://example.com/Scripts/main.ts

This issue does not occur in my development environment.

The problem arises within my index.html file. Upon verification, all paths seem correct and the main.ts file exists in the specified location.

<script src="/Scripts/systemjs.config.js"></script>
<script>
      System.import('/Scripts/main.ts').catch(function(err){ console.error(err); });
</script>

Interestingly, changing the extension of main.ts to main.js eliminates the 404 error entirely.

Below is the content of my systemjs.config.js file:

(function (global) {
  System.config({
    transpiler: 'ts',
    typescriptOptions: {
      "target": "es5",
      "module": "commonjs",
      "moduleResolution": "node",
      "sourceMap": true,
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "lib": ["es2015", "dom"],
      "noImplicitAny": true,
      "suppressImplicitAnyIndexErrors": true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    paths: {
      'npm:': 'https://unpkg.com/'
    },
    map: {
      app: 'app',
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      // Other angular modules...
      // RxJS mappings...

    },

    packages: {
        app: {
            format: 'register',
            main: '/Scripts/main.ts',
            defaultExtension: 'ts'
          },
          rxjs: {
            defaultExtension: 'js'
          }
        }
      });

    })(this);

Answer №1

If your browser does not support TypeScript, remember that only the TypeScript compiler understands it. The result of compiling TypeScript is JavaScript, therefore importing main.js is the appropriate file.

Answer №2

Do not listen to @Cobus Kruger's response, as it is filled with inaccuracies.

Importing TypeScript files directly in the browser during development (or bundling them dynamically) is completely valid, just as you are attempting to do. There is no requirement to run gulp tasks or any other compilation processes for your TypeScript code, whether it be for development purposes or bundling for production.

You simply have a few minor configuration mistakes.

Please see the updated config below. I have indicated the changes by adding extra blank lines around them

function (global) {
  System.config({

    defaultJSExtensions: true,

    baseURL: "/",

    transpiler: 'ts',
    typescriptOptions: {
      "target": "es5",
      "module": "system",
      "moduleResolution": "node",
      "sourceMap": true,
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "lib": ["es2015", "dom"],
      "noImplicitAny": true,
      "suppressImplicitAnyIndexErrors": true
    },
    paths: {
      'npm:': 'https://unpkg.com/'
    },
    map: {



      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
      '@angular/router/upgrade': 'npm:@angular/router/bundles/router-upgrade.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
      '@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',
      '@angular/upgrade/static': 'npm:@angular/upgrade/bundles/upgrade-static.umd.js',

      'rxjs':                      'npm:<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="daa8a2b0a99aeff4eaf4eb">[email protected]</a>',
      'ts':                        'npm:<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="40302c3527292e6d3439302533233229303400756e726e77">[email protected]</a>/lib/plugin.js',
      'typescript':                'npm:<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e7939e97829484958e9793a7d5c9d7c9d6d7">[email protected]</a>/lib/typescript.js',

    },

    packages: {

        // pay close attention to the differences especially here

      app: {

        // assuming Scripts is a subdirectory of app
        main: 'Scripts/main.ts',

        defaultExtension: 'ts',

        meta: {
          "*.ts": {
            loader: "ts"
          },

          "*.js": {
            loader: "ts"
          }
        }
      }
    }
  });

})(this);

Finally, adjust your in-browser bootstrapping to the following

<script src="/Scripts/systemjs.config.js"></script>
<script>
      System.import('app').catch(function(err){ console.error(err); });
</script>

Note that we import from the app package which will provide us with main.ts

Depending on where your Scripts folder is located in relation to your app folder, you may need to make some adjustments as it seems it was originating from the incorrect directory.

If you do not actually have a folder named app containing main.ts, simply update the name of your package in the packages section above from app to Scripts and then use System.import('Scripts').

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