ES2025 introduces significant enhancements including allowing regex capture groups to be duplicated across alternatives, adding powerful methods to the Set prototype such as intersection and union, and implementing subexpression modifiers for regex. Additionally, a new import type attribute defines MIME types, ensuring secure and validated imports of non-JS files like CSS and JSON. These updates aim to improve coding efficiency and expand the capabilities of JavaScript.
Regex capture groups are now allowed to be duplicated across alternatives in ES2025, which was previously disallowed and resulted in a syntax error.
Sets in ES2025 are expanded with new methods like intersection, union, and difference, enhancing their functionality in JavaScript.
Subexpression modifiers in ES2025 allow developers to apply regular expression flags like case insensitivity to specific portions of a regex rather than the entire expression.
The new import type attribute in ES2025 informs the module system about MIME types, enhancing security and ensuring correct validation for imported assets.
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