switch to callback + remove countableCollection (#382)

src/index.js

@@ -476,13 +476,13 @@ export function analyze(css, options = {}) {
         } else if (isProperty('line-height', property)) {
           lineHeights.p(stringifyNode(node), loc)
         } else if (isProperty('transition', property) || isProperty('animation', property)) {
-          let [times, fns] = analyzeAnimation(children, stringifyNode)
-          for (let i = 0; i < times.length; i++) {
-            durations.p(times[i], loc)
-          }
-          for (let i = 0; i < fns.length; i++) {
-            timingFunctions.p(fns[i], loc)
-          }
+          analyzeAnimation(children, function (item) {
+            if (item.type === 'fn') {
+              timingFunctions.p(stringifyNode(item.value), loc)
+            } else if (item.type === 'duration') {
+              durations.p(stringifyNode(item.value), loc)
+            }
+          })
           break
         } else if (isProperty('animation-duration', property) || isProperty('transition-duration', property)) {
           if (children && children.size > 1) {

src/selectors/utils.js

@@ -1,3 +1,4 @@
+// @ts-expect-error CSS Tree types are incomplete
 import walk from 'css-tree/walker'
 import { startsWith, strEquals } from '../string-utils.js'
 import { hasVendorPrefix } from '../vendor-prefix.js'
@@ -28,6 +29,7 @@ function analyzeList(selectorListAst, cb) {
   return childSelectors
 }
 
+/** @param {string} name */
 function isPseudoFunction(name) {
   return (
     strEquals(name, 'not')
@@ -102,7 +104,7 @@ export function isPrefixed(selector) {
 /**
  * Get the Complexity for the AST of a Selector Node
  * @param {import('css-tree').Selector} selector - AST Node for a Selector
- * @return {[number, boolean]} - The numeric complexity of the Selector and whether it's prefixed or not
+ * @return {number} - The numeric complexity of the Selector and whether it's prefixed or not
  */
 export function getComplexity(selector) {
   let complexity = 0

src/values/animations.js

@@ -21,10 +21,8 @@ const TIMING_FUNCTION_VALUES = new KeywordSet([
   'steps'
 ])
 
-export function analyzeAnimation(children, stringifyNode) {
+export function analyzeAnimation(children, cb) {
   let durationFound = false
-  let durations = []
-  let timingFunctions = []
 
   children.forEach(child => {
     let type = child.type
@@ -36,15 +34,22 @@ export function analyzeAnimation(children, stringifyNode) {
     }
     if (type === Dimension && durationFound === false) {
       durationFound = true
-      return durations.push(stringifyNode(child))
+      return cb({
+        type: 'duration',
+        value: child,
+      })
     }
     if (type === Identifier && TIMING_KEYWORDS.has(name)) {
-      return timingFunctions.push(stringifyNode(child))
+      return cb({
+        type: 'fn',
+        value: child,
+      })
     }
     if (type === Func && TIMING_FUNCTION_VALUES.has(name)) {
-      return timingFunctions.push(stringifyNode(child))
+      return cb({
+        type: 'fn',
+        value: child,
+      })
     }
   })
-
-  return [durations, timingFunctions]
 }

src/values/vendor-prefix.js

@@ -11,22 +11,15 @@ export function isValuePrefixed(node) {
     return false
   }
 
-  let list = children.toArray()
-
-  for (let index = 0; index < list.length; index++) {
-    let node = list[index]
+  for (let node of children) {
     let { type, name } = node;
 
     if (type === Identifier && hasVendorPrefix(name)) {
       return true
     }
 
     if (type === Func) {
-      if (hasVendorPrefix(name)) {
-        return true
-      }
-
-      if (isValuePrefixed(node)) {
+      if (hasVendorPrefix(name) || isValuePrefixed(node)) {
         return true
       }
     }