fix(cache): respect zero ttl

[Flo0806]

🔗 Linked issue

Fixes: #4125
Fixes: nuxt/nuxt#34307

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

swr: 0 set in nuxt.config.ts (see linked issue to Nuxt) it should be handled like max-age=0 - but it will be ignored, because Nitro checks if (swr) what is false with 0, too.
This fix checks explicitly for 0.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Modified SWR cache handling in route rules resolver to distinguish zero values from other falsy values. The swr: 0 configuration now correctly enables caching with maxAge=0 for explicit no-caching behavior, rather than being ignored. A comment documenting the behavior change was added.

Changes

Cohort / File(s)	Summary
SWR Cache Handling src/config/resolvers/route-rules.ts	Updated normalizeRouteRules to treat non-null and non-false SWR values (including zero) as enabling cache. Changed condition to explicitly check for null/false instead of relying on truthiness, allowing swr: 0 to set maxAge=0 for explicit no-caching.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~4 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix(cache): respect zero ttl' follows conventional commits format with type 'fix' and scope 'cache', clearly summarizing the main change.
Description check	✅ Passed	The description explains the bug fix, linked issues, and the problem with swr: 0 being treated as falsy, directly relating to the code changes.
Linked Issues check	✅ Passed	The code changes directly address the objectives in issues #4125 and #34307 by explicitly checking for 0 to treat swr: 0 the same as max-age=0.
Out of Scope Changes check	✅ Passed	The changes in route-rules.ts are scoped to fixing the swr: 0 handling issue; no out-of-scope modifications are present.

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✨ Finishing Touches

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📝 Coding Plan

• Generate coding plan for human review comments

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[coderabbitai]

🧹 Nitpick comments (1)

src/config/resolvers/route-rules.ts (1)

52-52: Remove the explanatory inline comment to match repo style.

Please drop this new comment and keep the logic self-descriptive through code alone.

As per coding guidelines: "Do not add comments explaining what the line does unless prompted".

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@src/config/resolvers/route-rules.ts` at line 52, Remove the inline
explanatory comment "// Cache: swr - allow `swr: 0` to set maxAge=0 (no cache)"
so the code follows repo style; leave the logic that handles the swr/maxAge
behavior intact (wherever swr and maxAge are used in this module, e.g., handling
swr: 0 -> maxAge = 0) but drop the comment so the implementation is
self-descriptive.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@src/config/resolvers/route-rules.ts`:
- Line 52: Remove the inline explanatory comment "// Cache: swr - allow `swr: 0`
to set maxAge=0 (no cache)" so the code follows repo style; leave the logic that
handles the swr/maxAge behavior intact (wherever swr and maxAge are used in this
module, e.g., handling swr: 0 -> maxAge = 0) but drop the comment so the
implementation is self-descriptive.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 056b06b6-caf5-44a4-868a-90ad46de3297

📥 Commits

Reviewing files that changed from the base of the PR and between 5d51b7f and 4dc0840.

📒 Files selected for processing (1)

• src/config/resolvers/route-rules.ts

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/nitro@4126

commit: 4dc0840