refactor(compiler): better constant hoist/stringify checks

packages/compiler-dom/__tests__/parse.spec.ts

@@ -6,7 +6,8 @@ import {
   ErrorCodes,
   ElementTypes,
   InterpolationNode,
-  AttributeNode
+  AttributeNode,
+  ConstantTypes
 } from '@vue/compiler-core'
 import { parserOptions, DOMNamespaces } from '../src/parserOptions'
 
@@ -253,7 +254,7 @@ describe('DOM parser', () => {
           type: NodeTypes.SIMPLE_EXPRESSION,
           content: `a < b`,
           isStatic: false,
-          isConstant: false,
+          constType: ConstantTypes.NOT_CONSTANT,
           loc: {
             start: { offset: 8, line: 1, column: 9 },
             end: { offset: 16, line: 1, column: 17 },

packages/compiler-dom/__tests__/transforms/stringifyStatic.spec.ts

@@ -2,7 +2,8 @@ import {
   compile,
   NodeTypes,
   CREATE_STATIC,
-  createSimpleExpression
+  createSimpleExpression,
+  ConstantTypes
 } from '../../src'
 import {
   stringifyStatic,
@@ -176,9 +177,8 @@ describe('stringify static html', () => {
                 '_imports_0_',
                 false,
                 node.loc,
-                true
+                ConstantTypes.CAN_HOIST
               )
-              exp.isRuntimeConstant = true
               node.props[0] = {
                 type: NodeTypes.DIRECTIVE,
                 name: 'bind',

packages/compiler-dom/src/transforms/transformStyle.ts

@@ -3,7 +3,8 @@ import {
   NodeTypes,
   createSimpleExpression,
   SimpleExpressionNode,
-  SourceLocation
+  SourceLocation,
+  ConstantTypes
 } from '@vue/compiler-core'
 import { parseStringStyle } from '@vue/shared'
 
@@ -36,5 +37,10 @@ const parseInlineCSS = (
   loc: SourceLocation
 ): SimpleExpressionNode => {
   const normalized = parseStringStyle(cssText)
-  return createSimpleExpression(JSON.stringify(normalized), false, loc, true)
+  return createSimpleExpression(
+    JSON.stringify(normalized),
+    false,
+    loc,
+    ConstantTypes.CAN_STRINGIFY
+  )
 }