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| // Helpers | ||
| //----------------------------------------------------------------------------- | ||
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| const animationPropertyPattern = /^animation(?:-name)?$/iu; |
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This should also check for vendored prefixes (e.g. -webkit-animation) as the @keyframes check also does.
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I’ve addressed the issue you pointed out. Thank you!
| /* | ||
| * If the value can't be matched against the property grammar, | ||
| * its animation name can't be determined reliably. This | ||
| * includes dynamic values such as var(). Invalid property |
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I think the rule should support checking local resolvable var declarations.
There will be a helper for this but this rule could already check the default value of a var, e.g. "slide-in" in animation: var(--animation-name, "slide-in").
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Thanks for pointing this out. After looking into it, I think it makes more sense for this rule to check values that can be determined statically, rather than trying to fully resolve every var() usage.
For example, var(--animation-name) would still be ignored when its actual value cannot be determined, while cases such as var(--animation-name, "slide-in") could be checked by extracting the statically known animation name from the fallback value.
For resolving local custom property values themselves, I think it would be better not to implement that separately in this PR, and instead make use of the helper you mentioned once it is available. So for this PR, I’m planning to support checking statically resolvable fallback values first.
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I ended up implementing var() handling a little more broadly than I initially described. Even when a value contains var(), the rule now checks fallback values as well as any statically known animation names around it. Actual custom property value resolution is still something I plan to handle later using the helper you mentioned.
One thing I’d like your opinion on is that this implementation re-parses the value using parse() from @eslint/css-tree. Since this does not use the custom parser when customSyntax is configured, I’d like to know whether you think this approach is okay.
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| } | ||
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| const name = getAnimationName(child); |
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The name should not be null as the lexer already checks that it is a string or an identifier. Otherwise a test case for this is missing.
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I removed the null check on the usage side. As you pointed out, the lexer only matches an identifier or a string as <keyframes-name>, so it can't be null in this case.
I kept the check on the @keyframes prelude side, though. This part isn't validated by the lexer, so @keyframes 50% can be parsed as Percentage and @keyframes 1s as Dimension. I also added tests for both cases.
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lumirlumir
added
accepted
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@DMartens I’ve updated the PR based on the previous feedback. When you have a chance, I’d appreciate it if you could take another look. |
| } | ||
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| return { | ||
| "Atrule[name=/^(-(o|moz|webkit)-)?keyframes$/i] > AtrulePrelude"( |
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| "Atrule[name=/^(-(o|moz|webkit)-)?keyframes$/i] > AtrulePrelude"( | |
| "Atrule[name=/^(-(o|ms|moz|webkit)-)?keyframes$/i] > AtrulePrelude"( |
The "ms" vendor-prefix is also missing here. Please also add a test case for this.
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Agreed, the ms prefix was missing. I added ms support for both keyframes and animation properties, along with related test cases. Thanks for the review!
| * @param {Array<Object>} varFunctions The `var()` functions to mask. | ||
| * @returns {string} The masked value text. | ||
| */ | ||
| function maskVarFunctions(text, baseOffset, varFunctions) { |
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Rather than using this hack, we should not use the lexer to find the animation names (it is okay that the property values may be wrong).
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I simplified the implementation so we no longer validate the entire property value with the lexer just to find animation names. It now identifies statically known animation names directly from the existing AST and only handles var() fallbacks when needed. I also added related tests.
| * @param {Object} node The node to read the children of. | ||
| * @returns {Array<Object>} The children of the node. | ||
| */ | ||
| function getChildren(node) { |
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The parser already converts every csstree list to an array.
As such this function is unnecessary and could be replaced with node.children ?? [] as it checks whether the node has children (e.g. may be called with an Identifier)
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Yes, thanks for pointing that out!
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| const animationPropertyPattern = /^animation(?:-name)?$/iu; | ||
| const animationPropertyPattern = | ||
| /^(?:-(?:o|moz|webkit)-)?animation(?:-name)?$/iu; |
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| /^(?:-(?:o|moz|webkit)-)?animation(?:-name)?$/iu; | |
| /^(?:-(?:o|moz|ms|webkit)-)?animation(?:-name)?$/iu; |
The "ms" vendor-prefix is missing. Please also add a test case for this.
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Yes, I added the ms vendor prefix and a test case for it. Thanks!
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
📝 Walkthrough
Merge Risk: ⚪ Minimal · up to No actionable issue identified here prevents merging after normal checks. Security Architecture Review
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| Check name | Status | Explanation |
|---|---|---|
| Description Check |  |
Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | |
The title clearly and concisely identifies the main change: adding the no-unknown-animations rule. |
| Linked Issues check | |
Issue #529 requires checks for statically determinable names in animation and animation-name against @keyframes in the same source. The rule collects standard and vendor-prefixed keyframes, chec… |
| Out of Scope Changes check | |
The changes add the requested rule, its tests, its documentation, and its README registration. Vendor-prefixed syntax, fallback parsing, and supporting test fixtures implement the rule objective. No u… |
| Docstring Coverage | |
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files. (1 skipped: 1 … |
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@src/rules/no-unknown-animations.js`:
- Around line 167-168: Update findAnimationNames so shorthand keyword categories
are tracked as consumed within each comma-separated animation, allowing repeated
keywords in the same category to be treated as animation names once that
category is already used. Preserve existing handling across separate animation
entries, and add a regression test covering animation: ease-in ease-out with no
matching keyframes.
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DMartens
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DMartens
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Thank you for applying the requested changes.
I have some more notes for the newly added code.
| /** | ||
| * Keywords that `animation-name` accepts in place of an animation name. | ||
| */ | ||
| const animationNameKeywords = new Set([ |
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These are not "animationNameKeywords" but CSS-wide keywords.
You should access them via sourceCode.lexer.cssWideKeywords as the user can expand them.
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Got it, thanks! One question: none isn't a CSS-wide keyword, but it's still special for animation-name. Should I keep handling none separately and use sourceCode.lexer.cssWideKeywords for the rest?
| * @returns {Object|null} The parsed value node, or `null` if the fallback | ||
| * can't be parsed. | ||
| */ | ||
| function parseVarFallback(fallback) { |
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There should be no need to parse the fallback value.
You can just wrap it as a string (and remove quotes around the value):
({ type: 'String', value: fallback.value })This allows reusing the rest of the code and using a string ensures it cannot be detected as a CSS-wide keyword.
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I removed the extra fallback parsing and now treat the fallback as a string value instead, trimming and unquoting it before reusing the animation-name extraction logic.
| for (const child of value.children ?? []) { | ||
| if (child.type === "Function") { | ||
| if (child.name.toLowerCase() === "var") { | ||
| const fallback = child.children.find( |
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Rather than checking for the "Raw" node, always use third child if it exists.
This should be more future-proof as we may enable parseCustomProperty in the future or a user uses the "tolerant" parsing.
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Good point, thanks! I changed this to always use the third child as the var() fallback when it exists, instead of looking specifically for a Raw node.
| } | ||
| } | ||
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| return fallback.type === "Value" ? fallback.children : [fallback]; |
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I don't see any test failing without this return value, can you share the example of such fallbacks and add to the tests also?
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I checked the case you mentioned and added tests for it. Thank you for taking the time to review and pointing out the case I missed!
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AI acknowledgment
What is the purpose of this pull request?
This PR adds the
no-unknown-animationsrule to report animation names that don't match any@keyframesrule defined in the same source.What changes did you make? (Give an overview)
no-unknown-animationsrule foranimationandanimation-namedeclarations.Related Issues
fixes #529
Disclosure: I'm a participant of open source contribution program OSSCA
Summary by CodeRabbit
Summary
@keyframesdefinitions in the stylesheet. It checks shorthand andanimation-namedeclarations, including vendor-prefixed properties and nested rules.var()fallbacks. Names supplied dynamically cannot be fully checked.