@weave-framework/prettier-plugin

A Prettier plugin for Weave templates — formats .weave SFCs and Weave-template .html files ( {{ }} interpolation, @if/@for/@switch/@defer/@await control flow, and on:/bind:/use:/class:/style:/ref bindings ).

Prettier's stock HTML parser throws on the first Weave-specific token (SyntaxError: Opening tag "Button" not terminated), so the usual workaround is to .prettierignore every template — meaning the files you edit most never get formatted. This plugin makes Weave templates first-class in the standard toolchain: format-on-save, prettier --check in CI, and pre-commit hooks all work again.

It does not ship its own grammar. It reuses @weave-framework/compiler's parser, so the formatter can never drift from what actually compiles. Embedded expressions are formatted by delegating to Prettier's own typescript printer; a .weave SFC's <script>/<style> blocks go through the typescript/css/scss printers.

Install

npm install -D @weave-framework/prettier-plugin
# peer dependency:
npm install -D prettier

Usage

Add the plugin to your Prettier config. .weave files are picked up automatically:

// .prettierrc
{
  "plugins": ["@weave-framework/prettier-plugin"]
}

Weave .html templates

.html is also used for plain HTML, so the plugin does not claim every .html globally. Route your Weave templates (the sibling-of-.ts convention) to the weave parser with an overrides entry:

// .prettierrc
{
  "plugins": ["@weave-framework/prettier-plugin"],
  "overrides": [
    { "files": "src/**/*.html", "options": { "parser": "weave" } }
  ]
}

Point the files glob at wherever your Weave templates live. Any .html not matched is left to Prettier's normal HTML formatter, untouched.

What it does

• Elements / components — attributes on one line when they fit, else one per line; void elements self-close.
• Bindings preserved by kind — on:x={{ }}, bind:x={{ }}, use:x={{ }}, class:x={{ }}, style:x={{ }}, ref={{ }}, .prop={{ }}, plain attr={{ }}, static attr="…". Kinds and event modifiers are never rewritten.
• Control flow — @if/@else, @for/@empty, @switch/@case/@default, @defer/ @placeholder, @await/@then/@catch, @let, @snippet/@render, @key are reindented with their @-syntax intact (and @@ stays escaped).
• Interpolations — the inner expression of every {{ … }} is formatted as TypeScript.
• SFCs — <script> (TypeScript), template, and <style> (CSS/SCSS) each formatted; block order preserved.
• Comments — HTML comments are preserved.
• Idempotent — running it twice produces no further changes.

Whitespace: conservative by design

The current release reindents block structure and formats expressions, but does not aggressively reflow inline text runs — so nothing that could change rendering (significant whitespace between inline elements, <pre>/<textarea> content) is altered. Prettier-grade inline whitespace reflow is a planned follow-up.

License

MIT