new skill typescript-coder

[jhauga]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

For full test results ctrl + click support-repo.

Most of the reference files use code examples from w3schools.com. They state in their terms of service that permitted use includes Copying examples and code snippets for non-profit teaching or research, and given that this repo has an MIT license; so non-profit, and it seems these work as a teaching tool, then no problem. The takeaway I get from their terms of use is - don't copy our content and make a competing website.

• Agent: Local
• Model: Claude Sonnet 4.5
• Number of Prompts: 1
• Post Edits: added 1 line:
  • <link href="favicon.png" rel="icon">

Prompt

ts-coder --create web-application 
         --project-scope worlds-most-cliche-type-safe-web-app 
         --use-library react 
         --run-in-browser=true 
         --create-pages [home(index.html), contact.html] 
         --page home="generic form to order parts from a manufacturer" 
         --page contact="generic form to contact customer support" 
         --app-hosting GitHubPages

Results

Good results:

• Functional form
• Throws error on missing required fields
• Throws errors on invalid fields

I think this could be configured and plugged into a server after adding production elements.

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• Other (please specify):

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

Adds a new TypeScript Coder skill to the skills catalog, bundling TypeScript guidance and reference material intended for Copilot-assisted TypeScript adoption and migration tasks.

Changes:

• Added new skill definition at skills/typescript-coder/SKILL.md describing when/how to use the skill and common workflows.
• Added a set of bundled TypeScript reference documents under skills/typescript-coder/references/.
• Registered the new skill in docs/README.skills.md.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
skills/typescript-coder/SKILL.md	New skill definition, usage guidance, and reference index.
skills/typescript-coder/references/typescript-basics.md	Basics/reference content for TypeScript fundamentals and inference.
skills/typescript-coder/references/typescript-cheatsheet.md	Cheatsheet-style reference content (control flow, classes, interfaces, types).
skills/typescript-coder/references/typescript-classes.md	Reference content for classes, generics, and utility types.
skills/typescript-coder/references/typescript-elements.md	Reference content for arrays/tuples/objects/enums/functions/casting.
skills/typescript-coder/references/typescript-handbook.md	Handbook-style reference based on official TS docs concepts.
skills/typescript-coder/references/typescript-keywords.md	Reference content for keyof, null/undefined, DefinitelyTyped, TS 5.x notes.
skills/typescript-coder/references/typescript-miscellaneous.md	Reference content for async, decorators, JSDoc, migration, error handling, etc.
skills/typescript-coder/references/typescript-projects.md	Reference content for tsconfig, Node/React setup, tooling, testing examples.
skills/typescript-coder/references/typescript-types.md	Reference content for advanced types (mapped/conditional/template literal, etc.).
docs/README.skills.md	Adds the new typescript-coder entry to the skills index table.

[aaronpowell]

I'm not sure that w3schools would be the best resource to point people to, why not use the TypeScript website? That way there's confidence that the most up to date content is available to the agent as it works.

Also, there might be some plugins that this would be useful to include with

[Copilot]

Pull request overview

Copilot reviewed 33 out of 55 changed files in this pull request and generated 5 comments.

[Copilot]

The section header suggests this is about readonly tuples, but the first example is a mutable tuple and discusses push(). Also, the statement “no type safety for indexes 3+” is at least misleading in modern TypeScript (tuple push is typed, and extra indices don’t become safely known). Consider renaming/restructuring the section (e.g., split into “Tuple mutation / push behavior” vs “Readonly tuples”) and clarify what is and isn’t type-safe.