perf(weapp-tailwindcss): 复用默认忽略路径集合

Author: sonofmagic

packages/weapp-tailwindcss/src/js/babel.ts

@@ -16,6 +16,7 @@ import { createTaggedTemplateIgnore } from './taggedTemplateIgnore'
 
 const EXPRESSION_WRAPPER_PREFIX = '(\n'
 const EXPRESSION_WRAPPER_SUFFIX = '\n)'
+const EMPTY_IGNORED_PATHS = new WeakSet<NodePath<StringLiteral | TemplateElement>>()
 const ignoredTaggedTemplateMatcherCache = new WeakMap<IJsHandlerOptions, ReturnType<typeof createNameMatcher>>()
 
 function getIgnoredTaggedTemplateMatcher(options: IJsHandlerOptions) {
@@ -35,17 +36,19 @@ export function analyzeSource(
   handler?: EvalHandler,
 ): SourceAnalysis {
   const jsTokenUpdater = new JsTokenUpdater()
-  const ignoredPaths = new WeakSet<NodePath<StringLiteral | TemplateElement>>()
-  const walker = new NodePathWalker(
-    {
-      ignoreCallExpressionIdentifiers: options.ignoreCallExpressionIdentifiers,
-      callback(path) {
-        if (path.isStringLiteral() || path.isTemplateElement()) {
+  // 仅在需要忽略特定调用参数时记录路径，默认路径复用共享空集合。
+  const needScope = Boolean(options.ignoreCallExpressionIdentifiers && options.ignoreCallExpressionIdentifiers.length > 0)
+  const ignoredPaths = needScope
+    ? new WeakSet<NodePath<StringLiteral | TemplateElement>>()
+    : EMPTY_IGNORED_PATHS
+  const walker = needScope
+    ? new NodePathWalker({
+        ignoreCallExpressionIdentifiers: options.ignoreCallExpressionIdentifiers,
+        callback(path) {
           ignoredPaths.add(path)
-        }
-      },
-    },
-  )
+        },
+      })
+    : new NodePathWalker()
 
   let taggedTemplateIgnore: ReturnType<typeof createTaggedTemplateIgnore> | undefined
 
@@ -59,9 +62,6 @@ export function analyzeSource(
     return taggedTemplateIgnore
   }
 
-  // 仅在需要时才构建作用域信息（例如需要遍历调用表达式的实参）。
-  const needScope = Boolean(options.ignoreCallExpressionIdentifiers && options.ignoreCallExpressionIdentifiers.length > 0)
-
   const targetPaths: NodePath<StringLiteral | TemplateElement>[] = []
   const importDeclarations = new Set<NodePath<ImportDeclaration>>()
   const exportDeclarations = new Set<NodePath<ExportDeclaration>>()

packages/weapp-tailwindcss/test/js/babel-utils.test.ts

@@ -64,6 +64,20 @@ describe('babel helpers additional coverage', () => {
     expect(ms.toString()).toBe(code)
   })
 
+  it('reuses an empty ignored path set when call ignore identifiers are disabled', () => {
+    const firstCode = 'const first = "w-[100px]"'
+    const secondCode = 'const second = "w-[200px]"'
+    const firstAnalysis = babel.analyzeSource(parse(firstCode, { sourceType: 'module' as const }), {})
+    const secondAnalysis = babel.analyzeSource(parse(secondCode, { sourceType: 'module' as const }), {})
+
+    const [firstTarget] = firstAnalysis.targetPaths
+    const [secondTarget] = secondAnalysis.targetPaths
+
+    expect(firstAnalysis.ignoredPaths).toBe(secondAnalysis.ignoredPaths)
+    expect(firstAnalysis.ignoredPaths.has(firstTarget)).toBe(false)
+    expect(secondAnalysis.ignoredPaths.has(secondTarget)).toBe(false)
+  })
+
   it('returns the original source when parsing fails', () => {
     const raw = 'const = 1'
     const result = babel.jsHandler(raw, {})