Add GitHub Copilot instructions configuration

[Copilot]

Summary

Configures GitHub Copilot coding agent per best practices to provide context about project structure, tooling, and conventions.

Details

Added .github/copilot-instructions.md documenting:

• Tech stack: TypeScript, Vitest, Biome, tsdown build toolchain
• Development workflow: Build (npm run build), test (npm test), format (npm run format)
• Code standards: Biome linting rules (2-space indent, single quotes, auto-organize imports)
• Project constraints: Minimal dependencies, maintain performance characteristics, no build artifacts in git
• CI/CD: Test coverage via Codecov, benchmarking via CodSpeed, security scanning via CodeQL
• Architecture: Source in src/, tests in test/, single production dependency (fast-querystring)

This enables Copilot to understand repository-specific patterns and avoid common mistakes when suggesting code changes.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• gh.io
  • Triggering command: curl -L REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ✨ Set up Copilot instructions #86

---

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (14b8455) to head (d4bc7d2).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #87   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          191       216   +25     
  Branches        63        73   +10     
=========================================
+ Hits           191       216   +25     

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[Copilot]

Pull Request Overview

This PR adds comprehensive GitHub Copilot instructions to help the AI coding agent understand the project structure, tooling, and conventions for the fast-url library. The documentation covers development workflow, code standards, architecture, and contribution guidelines.

Key Changes

• Added .github/copilot-instructions.md with 242 lines of comprehensive project documentation
• Documented tech stack (TypeScript, Vitest, Biome, tsdown)
• Included development workflows, CI/CD processes, and quality standards
• Outlined restrictions and performance considerations

[Copilot]

The claim that fast-querystring is a dependency is incorrect. The package.json file shows no 'dependencies' section at all, meaning there are zero production dependencies. The query string functionality is implemented in the local src/querystring/ directory, not via an external package.

Suggested change

	- Lightweight with minimal dependencies (only fast-querystring)
	- Lightweight with zero production dependencies (query string functionality is implemented locally)

[Copilot]

This is incorrect. The package.json file has no production dependencies. The query string functionality is implemented locally in src/querystring/stringify.ts and src/querystring/node.ts, not imported from fast-querystring. This section should either be removed or corrected to state 'No production dependencies'.

Suggested change

	- **fast-querystring**: The only production dependency, used for query string building
	- None (all query string functionality is implemented locally)

[Copilot]

[nitpick] The command should be bun test --coverage (without run), as shown in the actual test.yml workflow which uses bun run test --coverage but the package.json script is just test: vitest. Using bun run test --coverage would work, but the simpler bun test --coverage is more consistent with line 56.

Suggested change

	bun run test --coverage
	bun test --coverage

[codspeed-hq]

CodSpeed Performance Report

Merging #87 will not alter performance

_{Comparing copilot/set-up-copilot-instructions (d4bc7d2) with main (5b7ec21)}

Summary

✅ 158 untouched
⏩ 22 skipped¹

Footnotes

1. 22 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩