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+## SystemJS API
+
+For setting SystemJS configuration see the [Configuration API](config-api.md) page.
+
+#### System.amdDefine
+Type: `Function`
+
+For backwards-compatibility with AMD environments, set `window.define = System.amdDefine`.
+
+#### System.amdRequire
+Type: `Function`
+
+For backwards-compatibility with AMD environments, set `window.require = System.amdRequire`.
+
+#### System.config
+Type: `Function`
+
+SystemJS configuration helper function. See the [Configuration API](config-api.md).
+
+#### System.constructor
+Type: `Function`
+
+This represents the System base class, which can be extended or reinstantiated to create a custom System instance.
+
+Example:
+
+```javascript
+  var clonedSystem = new System.constructor();
+  clonedSystem.baseURL = System.baseURL;
+  clonedSystem.import('x'); // imports in a custom context
+```
+
+#### System.delete(moduleName)
+Type: `Function`
+
+Deletes a module from the registry by normalized name.
+
+```javascript
+System.delete('http://site.com/normalized/module/name.js');
+```
+
+#### System.get(moduleName) -> Module
+Type: `Function`
+
+Returns a module from the registry by normalized name.
+
+```javascript
+System.get('http://site.com/normalized/module/name.js').exportedFunction();
+```
+
+#### System.has(moduleName) -> Boolean
+Type: `Function`
+
+Returns whether a given module exists in the registry by normalized module name.
+
+```javascript
+if (System.has('http://site.com/normalized/module/name.js')) {
+  // ...
+}
+```
+
+#### System.import(moduleName [, normalizedParentName]) -> Promise(Module)
+Type: `Function`
+
+Loads a module by name taking an optional normalized parent name argument.
+
+Promise resolves to the module value.
+
+For loading relative to the current module, ES Modules define a `__moduleName` binding, so that:
+
+```javascript
+System.import('./local', __moduleName);
+```
+
+In CommonJS modules the above would be `module.id` instead.
+
+This is non-standard, but coverse a use case that will be provided by the spec.
+
+#### System.newModule(Object) -> Module
+Type: `Function`
+
+Given a plain JavaScript object, return an equivalent `Module` object.
+
+Useful when writing a custom `instantiate` hook or using `System.set`.
+
+#### System.register([name ,] deps, declare)
+Type: `Function`
+
+Declaration function for defining modules of the `System.register` polyfill module format.
+
+[Read more on the format at the loader polyfill page](https://github.com/ModuleLoader/es6-module-loader/blob/v0.17.0/docs/system-register.md)
+
+#### System.registerDynamic([name ,] deps, executingRequire, declare)
+Type: `Function`
+
+Companion module format to `System.register` for non-ES6 modules.
+
+Provides a `<script>`-injection-compatible module format that any CommonJS or Global module can be converted into for CSP compatibility.
+
+Output created by [SystemJS Builder](https://github.com/systemjs/builder) when creating bundles or self-executing bundles.
+
+For example, the following CommonJS module:
+
+```javascript
+module.exports = require('pkg/module');
+```
+
+Can be written:
+
+```javascript
+System.registerDynamic(['pkg/module'], true, function(require, exports, module) {
+  module.exports = require('pkg/module');
+});
+```
+
+`executingRequire` indicates that the dependencies are executed synchronously only when using the `require` function, and not before execution.
+
+* `require` is a standard CommonJS-style require
+* `exports` the CommonJS exports object, which is assigned to the `default` export of the module, with its own properties available as named exports.
+* `module` represents the CommonJS module object, with `export`, `id` and `url` properties set.
+
+#### System.set(moduleName, Module)
+Type: `Function`
+
+Sets a module into the registry directly and synchronously.
+
+Typically used along with `System.newModule` to create a valid `Module` object:
+
+```javascript
+System.set('custom-module', System.newModule({ prop: 'value' }));
+```
+
+> Note SystemJS stores all module names in the registry as normalized URLs. To be able to properly use the registry with `System.set` it is usually necessary to run `System.set(System.normalizeSync('custom-module'), System.newModule({ prop: 'value' }));` to ensure that `System.import` behaves correctly.
+
+#### System._nodeRequire
+Type: `Function`
+
+In CommonJS environments, SystemJS will substitute the global `require` as needed by the module format being loaded to ensure
+the correct detection paths in loaded code.
+
+The CommonJS require can be recovered within these modules from `System._nodeRequire`.