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Tempblot Prettier Plugin

Prettier plugin for formatting Tempblot (.blot) templates.

Installation

npm install --save-dev prettier prettier-plugin-tempblot

This package supports Prettier 3 and newer.

Configuration

Add the plugin to your Prettier configuration:

{
  "plugins": ["prettier-plugin-tempblot"]
}

The plugin registers .blot files with the tempblot parser, so Prettier can format Tempblot files once the plugin is loaded.

Usage

Format Tempblot files with the Prettier CLI:

npx prettier --write "**/*.blot"

You can also pass the plugin explicitly:

npx prettier --plugin prettier-plugin-tempblot --write "**/*.blot"

Use the plugin programmatically with parser: "tempblot":

import * as prettier from "prettier";
import tempblotPlugin from "prettier-plugin-tempblot";

const formatted = await prettier.format(source, {
  parser: "tempblot",
  plugins: [tempblotPlugin],
});

What Gets Formatted

The plugin formats the Tempblot document structure and delegates supported block contents to Prettier's built-in parsers.

Supported blocks:

• <setup> is formatted as TypeScript.
• <output> without lang, with lang="json", or with lang="jsonc" is formatted as JSON.
• <output lang="yaml"> and <output lang="yml"> are formatted as YAML.
• <output lang="html"> is formatted as HTML.
• <output lang="css"> is formatted as CSS.
• <output lang="javascript"> and <output lang="js"> are formatted as JavaScript.
• <output lang="typescript"> and <output lang="ts"> are formatted as TypeScript.

Unknown output languages are preserved as plain text after trimming surrounding whitespace.

Example

Input:

<!-- before -->
<setup>
const value={hello:"world",items:[1,2,3]}
</setup>

<output data-z="last" data-a="first" lang="json">
{"hello":"world","items":[1,2,3]}
</output>

Output:

<!-- before -->

<setup>
const value = { hello: "world", items: [1, 2, 3] };
</setup>

<output data-z="last" data-a="first" lang="json">
{ "hello": "world", "items": [1, 2, 3] }
</output>

Formatting Behavior

• Root-level blocks are separated by one blank line.
• Leading and trailing content outside Tempblot blocks is preserved after trimming surrounding whitespace.
• Attribute order is preserved.
• Empty blocks are printed with opening and closing tags on separate lines.
• Files are always written with a trailing newline.
• If an embedded parser cannot format a block, the original trimmed block contents are preserved.