1. Top-Level Await
You can now use await
at the top level of a module, enabling asynchronous operations without wrapping them in an async function.
2. Class Fields and Static Initialization Blocks
Public and private class fields are now supported, along with static initialization blocks.
3. Private Methods and Accessors in Classes
You can define private methods and accessors using the #
syntax.
4. Error Cause Property
The cause
property in error objects allows you to pass an underlying error when throwing a new one.
5. Array findLast
and findLastIndex
New methods findLast
and findLastIndex
search arrays from the end instead of the beginning.
6. Object.hasOwn
A new method to check for an object's own properties more reliably than Object.prototype.hasOwnProperty
.
7. RegExp d Flag
The d
flag allows you to get the index of the start of the match when using regular expressions.
8. Enhanced import.meta
import.meta
provides metadata about the current module, which can now include environment-specific information.
9. Ergonomic Brand Checks for Private Fields
Improved syntax for checking if a class instance has a private field.
10. JSON Modules
Import JSON files directly as modules, making it easier to work with configuration data.
These features enhance the robustness, readability, and efficiency of modern JavaScript code, making ES13 a significant step forward for developers.
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