chore: remove unused util function

packages/compiler-core/__tests__/utils.spec.ts

@@ -1,9 +1,5 @@
-import { Position, NodeTypes } from '../src/ast'
-import {
-  getInnerRange,
-  advancePositionWithClone,
-  isEmptyExpression
-} from '../src/utils'
+import { Position } from '../src/ast'
+import { getInnerRange, advancePositionWithClone } from '../src/utils'
 
 function p(line: number, column: number, offset: number): Position {
   return { column, line, offset }
@@ -71,41 +67,3 @@ describe('getInnerRange', () => {
     expect(loc2.end.offset).toBe(7)
   })
 })
-
-describe('isEmptyExpression', () => {
-  test('empty', () => {
-    expect(
-      isEmptyExpression({
-        content: '',
-        type: NodeTypes.SIMPLE_EXPRESSION,
-        isStatic: true,
-        isConstant: true,
-        loc: null as any
-      })
-    ).toBe(true)
-  })
-
-  test('spaces', () => {
-    expect(
-      isEmptyExpression({
-        content: '  \t  ',
-        type: NodeTypes.SIMPLE_EXPRESSION,
-        isStatic: true,
-        isConstant: true,
-        loc: null as any
-      })
-    ).toBe(true)
-  })
-
-  test('identifier', () => {
-    expect(
-      isEmptyExpression({
-        content: 'foo',
-        type: NodeTypes.SIMPLE_EXPRESSION,
-        isStatic: true,
-        isConstant: true,
-        loc: null as any
-      })
-    ).toBe(false)
-  })
-})