Bump typescript from 5.9.3 to 6.0.2

[dependabot]

Bumps typescript from 5.9.3 to 6.0.2.

Release notes

Sourced from typescript's releases.

TypeScript 6.0

For release notes, check out the release announcement blog post.

• fixed issues query for TypeScript 6.0.0 (Beta).
• fixed issues query for TypeScript 6.0.1 (RC).
• fixed issues query for TypeScript 6.0.2 (Stable).

Downloads are available on:

• npm

TypeScript 6.0 Beta

For release notes, check out the release announcement.

• fixed issues query for Typescript 6.0.0 (Beta).

Downloads are available on:

• npm

Commits

• 607a22a Bump version to 6.0.2 and LKG
• 9e72ab7 🤖 Pick PR #63239 (Fix missing lib files in reused pro...) into release-6.0 (#...
• 35ff23d 🤖 Pick PR #63163 (Port anyFunctionType subtype fix an...) into release-6.0 (#...
• e175b69 Bump version to 6.0.1-rc and LKG
• af4caac Update LKG
• 8efd7e8 Merge remote-tracking branch 'origin/main' into release-6.0
• 206ed1a Deprecate assert in import() (#63172)
• e688ac8 Update dependencies (#63156)
• 29b300d Bump the github-actions group across 1 directory with 2 updates (#63205)
• 0c2c7a3 DOM update (#63183)
• Additional commits viewable in compare view

TypeScript Fixes

Changes co-authored with Claude and the following was prepared by Claude as well.

Summary

Fix TypeScript 6 type errors across the codebase. TS6 introduces stricter type checking including: requiring explicit type arguments for generic types (Array, Promise), typing catch clause variables as unknown by default, stricter nullable type narrowing, and built-in Navigation API types.

Approach

Wherever possible, fixes use proper null guards and control flow narrowing instead of type casts, so that the code is genuinely safer at runtime — not just silencing the type checker.

Changes by scope

Embed Optimizer

• Use truthiness guard for dataset.odXpath instead of type cast
• Add null check for getElementData() return value

Image Prioritizer

• Use getAttribute() with truthiness guards instead of hasAttribute() + getAttribute() with type casts

Optimization Detective

• Wrap Promise constructors with Promise<void> type assertions; use arrow function wrappers for event listener resolve callbacks (TS6 no longer allows passing resolve directly as an EventListener)
• Use || '' fallback for sessionStorage.getItem() passed to parseInt()
• Add explicit type arguments to bare Array and Promise generics
• Add Record types to recursiveFreeze parameter and headers object for proper index signatures
• Add null guard for Object.assign with Map.get() result
• Add compressedPayload truthiness check in ternary to avoid Blob cast
• Cast getElementById result to HTMLElement for textContent access
• Add string type assertions for getAttribute() where null is excluded by control flow

Performance Lab

• Validate pluginSlug from dataset with early return guard
• Use shift() with undefined check instead of type cast for queue processing
• Use optional chaining for actionButtonList?.appendChild()
• Wrap event handler in arrow function to resolve MouseEvent/Event type mismatch

View Transitions

• Remove custom Window.navigation declaration that conflicts with TS6 built-in Navigation API types
• Add explicit type arguments to bare Array[] JSDoc types
• Use null guards with optional chaining for navigation activation/URL properties

Build Tools

• Install @types/lodash for proper type declarations
• Add @ts-ignore for @wordpress/scripts config modules (no types available)
• Use instanceof Error checks in catch clauses instead of any casts
• Add Record<string, string> type for webpack manifest and Compiler type for webpack plugin callback
• Use import('commander').Command type for CLI command parameter
• Simplify since.js control flow using direct opt.plugin truthiness check
• Add type predicate for changelog label filtering

[mukeshpanchal27]

@dependabot rebase

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: westonruter <westonruter@git.wordpress.org>
Co-authored-by: mukeshpanchal27 <mukesh27@git.wordpress.org>

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[mukeshpanchal27]

npm run tsc failed that need to check and fix.

[westonruter]

I'm putting Claude on this...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.33%. Comparing base (58c9063) to head (a622034).

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2434   +/-   ##
=======================================
  Coverage   69.33%   69.33%           
=======================================
  Files          90       90           
  Lines        7749     7749           
=======================================
  Hits         5373     5373           
  Misses       2376     2376           

Flag	Coverage Δ
multisite	69.33% <ø> (ø)
single	35.73% <ø> (ø)

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[mukeshpanchal27]

Can we move it to separate line?

[westonruter]

Sure. Done in 8d7718e