feat(twoslash): Introduce forked ESM-only Twoslash

[Adammatthiesen]

This pull request introduces a new ESM-only fork of Twoslash under the @ec-ts/twoslash package, specifically for the expressive-code-twoslash project. It adds the initial package structure, updates configurations and scripts to support the new package, and refactors related tooling for improved maintainability and scalability.

New package: @ec-ts/twoslash

• Initial setup of the ESM-only Twoslash fork for Expressive Code, including package.json, README.md, and LICENSE. The package exports core, fallback, and type definitions, and includes scripts for building and testing. [1] [2] [3] [4]

Core implementation and utilities:

• Added default compiler and handbook options (src/defaults.ts), a custom error class (src/error.ts), flag key generation scripts and output (scripts/flag-keys.ts, src/flag-keys.ts), fallback logic for removing Twoslash notations (src/fallback.ts), and main entry point with legacy compatibility (src/index.ts). [1] [2] [3] [4] [5] [6]

Configuration and tooling updates:

• Updated package.json scripts to support recursive package filtering, and changed Biome schema location for improved local resolution. [1] [2]
• Refactored Allure report configuration to dynamically generate plugin settings for packages with tests, improving maintainability and scalability. [1] [2]

Project metadata and labeler:

• Added ohash to recommended VSCode extensions.
• Updated .github/labeler.yml to recognize and label changes in the new @ec-ts/twoslash package and reorganized label rules for related packages and docs.

---

New package and structure

• Introduced the ESM-only @ec-ts/twoslash package with initial configuration, documentation, and licensing for Expressive Code integration. [1] [2] [3] [4]

Core implementation

• Added default compiler and handbook options, flag key generation, fallback logic, error handling, and main entry point with legacy compatibility for Twoslash. [1] [2] [3] [4] [5] [6]

Configuration and tooling

• Refactored Allure report plugins to be dynamically generated for packages with tests, updated Biome schema location, and improved package filtering in scripts. [1] [2] [3] [4]

Labeler updates

• Updated .github/labeler.yml to support new package and reorganized label rules for related packages and docs.

[changeset-bot]

🦋 Changeset detected

Latest commit: 128027f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@ec-ts/twoslash	Major

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[htg-1-studiocms-cloud]

Dokploy Preview Deployment

Name	Status	Preview	Updated (UTC)
Expressive-Code-Twoslash Docs	✅ Done	Preview URL	2026-02-24T03:54:19.880Z

[pkg-pr-new]

npm i https://pkg.pr.new/withstudiocms/expressive-code-twoslash/css-js-gen@85

npm i https://pkg.pr.new/withstudiocms/expressive-code-twoslash@85

npm i https://pkg.pr.new/withstudiocms/expressive-code-twoslash/@ec-ts/twoslash@85

npm i https://pkg.pr.new/withstudiocms/expressive-code-twoslash/@ec-ts/vfs@85

commit: 128027f

[apollo-git-bot]

Allure Report Summary

	Name	Duration	Stats	New	Flaky	Retry	Report
	css-js-gen Tests	15ms	37	37	0	0
	@ec-ts/twoslash Tests	29s 750ms	29	29	0	0
	@ec-ts/vfs Tests	7s 115ms	21	21	0	0

[dreyfus92]

here we go again 😄