esbuild 0.13.10

Implement legal comment preservation for CSS (#1539)

This release adds support for legal comments in CSS the same way they are already supported for JS. A legal comment is one that starts with /*! or that contains the text @license or @preserve. These comments are preserved in output files by esbuild since that follows the intent of the original authors of the code. The specific behavior is controlled via --legal-comments= in the CLI and legalComments in the JS API, which can be set to any of the following options:
- none: Do not preserve any legal comments
- inline: Preserve all rule-level legal comments
- eof: Move all rule-level legal comments to the end of the file
- linked: Move all rule-level legal comments to a .LEGAL.txt file and link to them with a comment
- external: Move all rule-level legal comments to a .LEGAL.txt file but to not link to them
The default behavior is eof when bundling and inline otherwise.
Allow uppercase es* targets (#1717)

With this release, you can now use target names such as ESNext instead of esnext as the target name in the CLI and JS API. This is important because people don't want to have to call .toLowerCase() on target strings from TypeScript's tsconfig.json file before passing it to esbuild (TypeScript uses case-agnostic target names).

This feature was contributed by @timse.
Update to Unicode 14.0.0

The character tables that determine which characters form valid JavaScript identifiers have been updated from Unicode version 13.0.0 to the newly-released Unicode version 14.0.0. I'm not putting an example in the release notes because all of the new characters will likely just show up as little squares since fonts haven't been updated yet. But you can read https://www.unicode.org/versions/Unicode14.0.0/#Summary for more information about the changes.