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Runtime behaviour defined by a host-defined default loader. Implicitly async model — no code executes until requested modules are available and processed. Babel can transpile ES Modules to several different formats including Common. You can even create your own. For more details see the modules docs. What is below is from a previous ES draft. The default module loader can be configured, and new loaders can be constructed to evaluate and load code in isolated or constrained contexts.
Symbols enable access control for object state. Symbols allow properties to be keyed by either string as in ES5 or symbol. Symbols are a new primitive type. Optional name parameter used in debugging - but is not part of identity. Symbols are unique like gensym , but not private since they are exposed via reflection features like Object. Limited support requires the Babel polyfill. Due to language limitations, some features can't be transpiled or polyfilled. See core.
- The GNU C Reference Manual.
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Built-in subclassability should be evaluated on a case-by-case basis as classes such as HTMLElement can be subclassed while many such as Date , Array and Error cannot be due to ES5 engine limitations. Many new library additions, including core Math libraries, Array conversion helpers, and Object.
Most of these APIs are supported by the Babel polyfill. However, certain features are omitted for various reasons e.
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In order to support Promises you must include the Babel polyfill. Full reflection API exposing the runtime-level meta-operations on objects. This is effectively the inverse of the Proxy API, and allows making calls corresponding to the same meta-operations as the proxy traps. Especially useful for implementing proxies. Calls in tail-position are guaranteed to not grow the stack unboundedly. Makes recursive algorithms safe in the face of unbounded inputs.
Only explicit self referencing tail recursion was supported due to the complexity and performance impact of supporting tail calls globally. Removed due to other bugs and will be re-implemented. Guides What is Babel? Usage Options Config Files cli polyfill transform-runtime register.
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Presets env stage-0 stage-1 stage-2 stage-3 flow react minify typescript. Tooling parser core generator code-frame helpers runtime template traverse types. Template Strings Template strings provide syntactic sugar for constructing strings.