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prettier-plugin-eta

Prettier plugin for Eta templates.

Install

npm install --save-dev prettier prettier-plugin-eta

Use

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

npx prettier --write "views/**/*.eta"

Scope

Safe full-document formatting for Eta templates:

• formats JavaScript inside execution and output tags with babel-ts;
• formats surrounding HTML through Prettier's HTML parser;
• preserves Eta trim markers, %> inside JavaScript strings, and template-literal content;
• honors standard Prettier options (printWidth, tabWidth, useTabs, singleQuote, semi, trailingComma, proseWrap, htmlWhitespaceSensitivity).

Range formatting is intentionally out of scope.

Secondary export: prettier-plugin-eta/html-tag-matcher

For editor tooling that needs to find matching HTML tag pairs in Eta templates (e.g. VS Code document-highlight providers), the plugin exposes its Eta-aware matcher as a separate entry point:

import { findMatchingHtmlTag } from "prettier-plugin-eta/html-tag-matcher";

const match = findMatchingHtmlTag(source, cursorOffset);
if (match?.mate) {
  // match.primary and match.mate are { start, end } offsets into `source`.
}

The matcher skips <% … %> regions using the plugin's lexer so tags inside Eta control blocks stay balanced.

Links

• Repository and issues: https://github.com/JoobyPM/eta-template-language
• Release notes: https://github.com/JoobyPM/eta-template-language/blob/main/CHANGELOG.md