build: move cssVars logic into compiler-sfc entry

packages/compiler-sfc/src/parse.ts

@@ -10,6 +10,7 @@ import {
 import hash from 'hash-sum'
 import LRU from 'lru-cache'
 import { hmrShouldReload } from './compileScript'
+import { parseCssVars } from './cssVars'
 
 const cache = new LRU<string, SFCDescriptor>(100)
 
@@ -57,6 +58,10 @@ export function parse(options: SFCParseOptions): SFCDescriptor {
   }
 
   output.filename = filename
+
+  // parse CSS vars
+  output.cssVars = parseCssVars(output)
+
   output.shouldForceReload = prevImports =>
     hmrShouldReload(prevImports, output!)
 

packages/compiler-sfc/src/parseComponent.ts

@@ -4,7 +4,6 @@ import { makeMap } from 'shared/util'
 import { ASTAttr, WarningMessage } from 'types/compiler'
 import { BindingMetadata, RawSourceMap } from './types'
 import type { ImportBinding } from './compileScript'
-import { parseCssVars } from './cssVars'
 
 export const DEFAULT_FILENAME = 'anonymous.vue'
 
@@ -209,8 +208,5 @@ export function parseComponent(
     outputSourceRange: options.outputSourceRange
   })
 
-  // parse CSS vars
-  sfc.cssVars = parseCssVars(sfc)
-
   return sfc
 }