Add JSON Schemas to tsconfig.json and package.json

[ShyamGadde]

Summary

Fixes #2329

This PR adds JSON Schema references to tsconfig.json and package.json so that these files can be validated by the existing validate-json-schema.js script.

It also updates the validator to correctly handle schemas defined using different JSON Schema drafts. In particular, the tsconfig.json schema is defined using draft-04, whereas AJV defaults to draft-07.

Relevant technical choices

• Introduced separate AJV instances for draft-07 and draft-04 schemas, since AJV cannot mix schema drafts within a single instance.
• Added ajv-draft-04 as a dependency to support validation of schemas defined using JSON Schema draft-04 (e.g., the tsconfig.json schema).
• Detect the schema draft based on the referenced schema’s $schema value and route validation to the appropriate AJV instance.
• Added a small in-memory cache for fetched schemas to avoid repeated network requests during validation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.17%. Comparing base (11d0f73) to head (934549f).
⚠️ Report is 10 commits behind head on trunk.

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2330   +/-   ##
=======================================
  Coverage   69.17%   69.17%           
=======================================
  Files          90       90           
  Lines        7696     7696           
=======================================
  Hits         5324     5324           
  Misses       2372     2372           

Flag	Coverage Δ
multisite	69.17% <ø> (ø)
single	35.35% <ø> (ø)

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[Copilot]

Pull request overview

This PR adds JSON Schema references to tsconfig.json and package.json files to enable validation via the existing validate-json-schema.js script. It enhances the validator to support multiple JSON Schema draft versions by introducing separate AJV instances for draft-04 and draft-07, along with schema caching to optimize network requests.

• Added $schema references to tsconfig.json and package.json
• Introduced ajv-draft-04 dependency to support draft-04 schema validation
• Refactored the validator to detect schema drafts and route to appropriate AJV instances

Reviewed changes

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

File	Description
tsconfig.json	Added $schema reference for validation support
package.json	Added $schema reference and ajv-draft-04 dependency
package-lock.json	Installed ajv-draft-04 package
bin/validate-json-schema.js	Refactored to support multiple schema drafts with caching and draft detection

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[westonruter]

@ShyamGadde This is great! Any reason why this is still a draft?

[Copilot]

Pull request overview

Copilot reviewed 1 out of 4 changed files in this pull request and generated no new comments.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 4 changed files in this pull request and generated no new comments.

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[github-actions]

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Co-authored-by: ShyamGadde <shyamgadde@git.wordpress.org>
Co-authored-by: westonruter <westonruter@git.wordpress.org>

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[ShyamGadde]

Any reason why this is still a draft?

@westonruter I left it as a draft initially to get feedback on the AJV draft-handling approach. It should be ready now.