[Nephtys]

Importing an external library for lightweight operations increases overall size of the program.
Using native methods instead reduces the amount of memory and storage to run and store the application.
This is especially critical in environments with limited resources, such as on mobile devices or in web applications
where bandwidth and download times matter.

Smaller programs generally have better runtime performance.
Reducing the number of unnecessary modules minimizes the amount of code that needs to be interpreted or compiled,
leading to faster execution and improved overall performance.

It also increases the maintainability and security of your program by depending on less external dependencies.

[Copilot]

Pull request overview

This PR introduces a new eco-design lint rule (GCI535) to discourage using external number-formatting libraries for lightweight formatting tasks, preferring native Intl.NumberFormat, and wires the rule into the Sonar JavaScript profile and project documentation.

Changes:

• Added ESLint rule @creedengo/no-imported-number-format-library with unit tests and documentation.
• Added Sonar hook class NoImportedNumberFormatLibrary and registered it in CheckList.
• Enabled rule key GCI535 in the Sonar JavaScript profile and added a test-project example + changelog entry.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
test-project/src/no-imported-number-format-library.js	Adds sample compliant/non-compliant code for the new rule.
sonar-plugin/src/main/resources/org/greencodeinitiative/creedengo/profiles/javascript_profile.json	Activates GCI535 in the JS profile.
sonar-plugin/src/main/java/org/greencodeinitiative/creedengo/javascript/checks/NoImportedNumberFormatLibrary.java	Adds Sonar EslintHook mapping for the new rule key.
sonar-plugin/src/main/java/org/greencodeinitiative/creedengo/javascript/CheckList.java	Registers the new hook in the Sonar plugin checklist.
eslint-plugin/tests/lib/rules/no-imported-number-format-library.test.js	Adds ESLint RuleTester coverage for the new rule.
eslint-plugin/README.md	Documents the new rule in the rules table.
eslint-plugin/lib/rules/no-imported-number-format-library.js	Implements the new ESLint rule logic (numbro/numerable detection).
eslint-plugin/docs/rules/no-imported-number-format-library.md	Adds rule documentation and examples.
CHANGELOG.md	Adds an Unreleased changelog entry for GCI535.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.