带有baseURL的Systemjs配置在角度

Question

我想用baseURL配置systemjs.config，因为我的应用程序位于其他文件夹中。尝试加载时，我收到404错误

/SPA/SPA/App.main.js而不是SPA/App.main.js

SiteRoot

--- SPA

--------- App

-------------- Main.js

--- system.src.js

--- systemjs.config.js

--- gulp.js

SystemJs.config

(function (global) {
  System.config({

    baseURL: "SPA",

    paths: {
        "npm:": "node_modules/"
    },

    map: {

      app: "App",

      // angular bundles
      "@angular/core": "npm:@angular/core/bundles/core.umd.js"
      // all other angular bundles
      // other libraries
      "rxjs": "npm:rxjs",
      "tslib": "npm:tslib/tslib.js"  
    },

    packages: {
      app: { main: "main.js", defaultExtension: "js" },
      rxjs: { defaultExtension: "js" }
    },

    meta: {
      "*": { authorization: true }

    }    
  });
})(this);

SPA / index.html

<base href="/SPA/" />

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

Gulp.js

var SystemJsBuilder = require('systemjs-builder');

var paths = {
  npm: 'node_modules/',
  app: 'SPA/App/',
  appBundle: 'SPA/App/app.bundle.js'  
};

gulp.task('release:bundle-app', ['delete:app-bundle', 'release:embed-templates'], function () {

    var builder = new SystemJsBuilder('./', 'systemjs.config.js');
    var buildStatic = builder.buildStatic('SPA/App/main.js', paths.appBundle, { minify: true, sourceMaps: false });

    return buildStatic;
});

gulp.task('release:bundle-rxjs', function () {

    var options = {
        normalize: false,
        runtime: false,
        sourceMaps: false,
        sourceMapContents: false,
        minify: false,
        mangle: false
    };

    var builder = new SystemJsBuilder('./');

    builder.config({
        paths: {
            //'n:*': 'node_modules/*',
            'rxjs/*': 'node_modules/rxjs/*.js'
        },
        map: { 'rxjs': 'node_modules/rxjs' },
        packages: { 'rxjs': { main: 'Rx.js', defaultExtension: 'js' } }
    });

    return builder.bundle('rxjs', paths.libs + 'rxjs/rxjs.js', options);
});

我不确定配置中出现了什么问题，并试图找出最近几天的结果，但没有任何效果。

当应用程序在子文件夹中运行时，如何配置systemjs.config？我还将这个systemjs.config加载到gulp.js中，因此将其放在根目录中。