perf(jsx): JSX performance improvement

[usualoma]

This PR fixes #439.

Changes

There are no changes to the external specification in this PR, and we can continue to stringify templates with (<p>text</p>).toString(). However, there are some changes in the internal structure.

jsx returns JSXNode instead of HtmlEscapedString

Previously, upon calling jsx, basic stringification was completed and an HtmlEscapedString object was returned, but with this PR, a data-wrapped JSXNode is returned upon calling jsx. The stringification is done at toString() call.

Discussion

With this PR, escape defined in utils/html is no longer used inside the hono repository. (Only escapeToBuffer is used.)

The escape function is fast enough and convenient for hono users to use in their applications, but depending on policy, it could be removed as unnecessary.

Benchmark

Hono x 173,197 ops/sec ±2.16% (93 runs sampled)
React x 84,569 ops/sec ±2.81% (91 runs sampled)
Preact x 61,307 ops/sec ±3.21% (86 runs sampled)
Nano x 16,871 ops/sec ±5.46% (78 runs sampled)
Fastest is Hono

[yusukebe]

Hi @usualoma !

Great! I confirmed that it also works on Bun.

The escape function is fast enough and convenient for hono users to use in their applications, but depending on policy, it could be removed as unnecessary.

Yes, I think it's better to remove utils/html. I'll do it another PR.

I'll merge this PR!