![]() This is useful for performance of deep re-exports where unnecessary setter operations can be avoided, otherwise setter performance ![]() register (, function ( $_export, $_moduleContext ) ) When compiling ES6 modules to ES5, the Traceur instantiate output and Babel system output generates something like the following: This allows the importing environment to name the module into whatever namespace it likes without imposing a specific When files are separately compiled, with only one System.register call per module, the name should not be set. Naming multiple modules in the same JS file creating a bundle format. When a module name string is provided as the first argument in the System.register call, the format is suitable for Just like AMD define, System.register can be both named and anonymous. Internally when transpiling and executing ES6. The ES6 Module Loader polyfill also uses this format SystemJS, SystemJS Self-Executing BundlesĪnd ES6 Micro Loader. To run the format, a suitable loader implementation needs to be used that understands how to execute it. In this way it acts as a safe and comprehensive target format for the polyfill path into ES6 modules. All dynamic binding and circular reference behaviors supported by ES6 modules are supportedīy this format. It is a format that was developed out of collaboration and is supported as a module output in Traceur (as instantiate),īabel, TypeScript and Rollup (as system). The latest iteration (as of ES Module Loader 2.3.0 / SystemJS 0.21.4) also includes support for top-level await via a Promise return from the execute function. System.register can be considered as a new module format designed to support the exact semantics of ES6 modules within ES5.
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