UCHover is a VS Code extension that previews Unicode escape sequences in hover tooltips. It decodes supported escape forms directly from file text and shows the rendered character, its code point, and its Unicode name.

What it does

Hover a supported Unicode escape to see the rendered character.
Decode BMP and astral code points.
Combine valid UTF-16 surrogate-pair escapes.
Show a selection preview when you select multiple escapes and hover one of them.

Supported escape forms

\uXXXX
\u{...}
\UXXXXXXXX
Adjacent surrogate pairs such as \uD83D\uDE00

Examples:

\u0041 -> A
\u{1F600} -> 😀
\U0001F600 -> 😀
\uD83D\uDE00 -> 😀

Hover behavior

When the cursor is inside a supported escape token, UCHover shows:

the decoded character
the original escape text
the Unicode code point
the Unicode name

Invalid escapes do not produce a hover. Isolated surrogates and out-of-range scalar values are ignored.

Selection preview

If you select text that contains supported escapes and hover one of those escapes inside the selection, UCHover adds a second hover block with the decoded character sequence.

Selection preview rules:

only decoded characters are shown
plain text between escapes is ignored
valid escapes are decoded in source order
invalid escapes are skipped

Example selection:

\u0041 hello \u{1F600}

Sequence preview:

A😀

Development

Requirements:

Node.js
pnpm
VS Code 1.120.0 or newer for the extension host

Useful commands:

pnpm run compile
pnpm run watch
pnpm test
npm run vsix:package

Notes:

pnpm run compile builds the bundled extension into dist/.
pnpm test runs the VS Code extension test host. The first run may download the VS Code test binary.
npm run vsix:package uses the project-local @vscode/vsce to build a VSIX and avoids relying on a global vsce install.