feat(eslint-config-fluid): generate deprecated-rules data and remove deprecated stylistic rules

[tylerbutler]

Summary

• Adds a generate-deprecated-rules script that introspects rule metadata from ESLint core and every plugin referenced by the flat configs, then writes the results — including replacedBy info and whether each rule is enabled in our resolved configs and/or referenced from our local rule sources — to data/deprecated-rules.json. Wired into npm run build after print-configs.
• Removes a batch of deprecated core ESLint stylistic rules from library/rules/base.mts (arrow-parens, brace-style, comma-dangle, comma-spacing, eol-last, func-call-spacing, keyword-spacing, linebreak-style, max-len, new-parens, newline-per-chained-call, no-extra-semi, no-multiple-empty-lines, no-trailing-spaces, no-whitespace-before-property, object-curly-spacing, padded-blocks, padding-line-between-statements, quote-props, quotes, semi, semi-spacing, space-before-blocks, space-before-function-paren, space-in-parens, space-infix-ops, spaced-comment) plus the deprecated @typescript-eslint/typedef rule. Prettier already covers formatting concerns.
• Stops re-enabling no-multi-spaces after prettierConfig in library/configs/base.mts — left disabled since it is also deprecated.
• Switches print-configs to run via jiti and adds data/ to .prettierignore.
• Regenerates printed-configs/*.json to reflect the rule removals.

[Copilot]

Pull request overview

This PR adds a script to automatically generate a JSON file containing all deprecated ESLint rules from core ESLint and 12 plugins. The script intelligently detects and uses either flat config (flat.mts) or legacy CJS configs (recommended.js, strict.js) to determine which deprecated rules are currently configured in the project.

Changes:

• Adds a new TypeScript script that queries rule metadata from ESLint and all configured plugins to identify deprecated rules
• Generates a comprehensive JSON output tracking 119 deprecated rules, their replacement rules, and configuration status
• Adds the typescript-eslint package as a dependency to support the script's functionality

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
common/build/eslint-config-fluid/scripts/generate-deprecated-rules.ts	New script that extracts deprecated rules from ESLint core and plugins, with fallback logic for config loading
common/build/eslint-config-fluid/printed-configs/deprecated-rules.json	Auto-generated JSON output containing 119 deprecated rules with metadata about replacements and configuration status
common/build/eslint-config-fluid/package.json	Adds generate-deprecated-rules npm script and typescript-eslint dependency
common/build/eslint-config-fluid/pnpm-lock.yaml	Lockfile updates for the new typescript-eslint dependency

Files not reviewed (1)

• common/build/eslint-config-fluid/pnpm-lock.yaml: Language not supported

[github-actions]

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[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

> fluid-framework-docs-site@0.0.0 ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> fluid-framework-docs-site@0.0.0 serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> fluid-framework-docs-site@0.0.0 check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  288859 links
    1925 destination URLs
    2175 URLs ignored
       0 warnings
       0 errors