Angular 4 is throwing an error because it cannot find the reference to the System object

I integrated angular2-recaptcha into my project from https://github.com/xmaestro/angular2-recaptcha.

Here is the snippet I added to my systemjs.config.js:

System.config({
  map: {
    'angular2-recaptcha': 'node_modules/angular2-recaptcha'
  },
  packages: {
    app: {
      format: 'register',
      defaultExtension: 'js'
    },
    'angular2-recaptcha': {defaultExtension: 'js', main:'index'}
  }
});

In my index.html, I included the following script:

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

However, upon checking the browser console, I am encountering this error:

  Uncaught ReferenceError: System is not defined
    at localhost/:29
compiler.es5.js:15996 Uncaught Error: Unexpected module 'ReCaptchaModule' declared by the module 'AppModule'. Please add a @Pipe/@Directive/@Component annotation.
    at syntaxError (compiler.es5.js:1690)
    at compiler.es5.js:15430
    at Array.forEach (<anonymous>)
    at CompileMetadataResolver.webpackJsonp.../../../compiler/@angular/compiler.es5.js.CompileMetadataResolver.getNgModuleMetadata (compiler.es5.js:15412)
    at JitCompiler.webpackJsonp.../../../compiler/@angular/compiler.es5.js.JitCompiler._loadModules (compiler.es5.js:26795)
    at JitCompiler.webpackJsonp.../../../compiler/@angular/compiler.es5.js.JitCompiler._compileModuleAndComponents (compiler.es5.js:26768)
    at JitCompiler.webpackJsonp.../../../compiler/@angular/compiler.es5.js.JitCompiler.compileModuleAsync (compiler.es5.js:26697)
    at PlatformRef_.webpackJsonp.../../../core/@angular/core.es5.js.PlatformRef_._bootstrapModuleWithZone (core.es5.js:4536)
    at PlatformRef_.webpackJsonp.../../../core/@angular/core.es5.js.PlatformRef_.bootstrapModule (core.es5.js:4522)
    at Object.../../../../../src/main.ts (main.ts:11)

I need assistance in identifying and rectifying the error. Can someone guide me? Thank you!

javascriptangulartypescript

Answer №1

Ensure that you are loading the SystemJS library rather than just the configuration:

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

Additionally, it is important to note that using System is now deprecated. Instead, use SystemJS where System expects a global object. For instance, replace instances of System.import with SystemJS.import.

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