Add WProofreader spelling and grammar check module for Quill

[Artem-Okladov]

Adds the initial implementation of WProofreader as a native Quill module. Spelling and grammar checking is enabled declaratively through Quill's configuration, with a toolbar dropdown button that follows the editor's state.

What's included

• Module (src/index.js entry + src/wproofreader.js), registered as modules/wproofreader. It initializes WProofreader via the @webspellchecker/wproofreader-sdk-js SDK and exposes enable, disable, toggle, openSettings, openDialog, isDisabled, and destroy.
• Toolbar dropdown (src/wproofreader-dropdown.js): when the editor has a toolbar, a WProofreader button is injected; clicking it opens a dropdown with Disable, Settings, and Proofread in dialog when enabled, and Enable when disabled. The actions are performed by the WProofreader engine.
• Read-only support: proofreading and the toolbar button follow the editor's editable state, at init and when toggled at runtime via quill.enable().
• Styles (src/styles.css), exported as @webspellchecker/wproofreader-quill/styles.css, and the button icon (src/icon.svg).
• TypeScript declarations (src/index.d.ts).
• Test suite (Vitest + jsdom): 27 tests in tests/
• CI (.github/workflows/ci.yml): runs test suite on pull requests and pushes to main.

How it works

• Enable it via modules.wproofreader; options are forwarded to the SDK's init(). srcUrl selects the bundle (cloud default, or an on-premise URL).
• Scoped to the editor through init({ container: quill.root }). It does not enable the page-wide autoSearch option.
• The module always sets appType: "wpr_quill" to identify the integration; this value is fixed and ignores any appType passed in the config.
• The module and the dropdown are decoupled: they coordinate through events on quill.root (src/events.js), with no direct references in either direction. WProofreader's destroy() tears down the dropdown via an event.
• quill and @webspellchecker/wproofreader-sdk-js are peer dependencies; the SDK loads the engine at runtime.

Build and packaging

• Vite library build to dist/index.js (ESM) and dist/index.umd.cjs (UMD); quill and the SDK are external.
• Licensed under MIT.

Test plan

• npm test (27 passing)
• npm run build (ESM + UMD)
• Verified against Quill configuration variations (bubble theme, read-only, placeholder, formats whitelist) in a standalone demo and both supported major Quill branches (1.x & 2.x)

Video demo

Screen.Recording.2026-06-23.at.07.55.48.mov

[Bohdan-Chui]

Looks very good. Please, add video example of usage

[Bohdan-Chui]

Is this plugin compatible with quill 1..?