refactor(compiler): better constant hoist/stringify checks

packages/compiler-sfc/src/templateTransformAssetUrl.ts

@@ -1,5 +1,6 @@
 import path from 'path'
 import {
+  ConstantTypes,
   createSimpleExpression,
   ExpressionNode,
   NodeTransform,
@@ -159,19 +160,26 @@ function getImportsExpressionExp(
       return existing.exp as ExpressionNode
     }
     const name = `_imports_${importsArray.length}`
-    const exp = createSimpleExpression(name, false, loc, true)
-    exp.isRuntimeConstant = true
+    const exp = createSimpleExpression(
+      name,
+      false,
+      loc,
+      ConstantTypes.CAN_HOIST
+    )
     context.imports.add({ exp, path })
     if (hash && path) {
-      const ret = context.hoist(
-        createSimpleExpression(`${name} + '${hash}'`, false, loc, true)
+      return context.hoist(
+        createSimpleExpression(
+          `${name} + '${hash}'`,
+          false,
+          loc,
+          ConstantTypes.CAN_HOIST
+        )
       )
-      ret.isRuntimeConstant = true
-      return ret
     } else {
       return exp
     }
   } else {
-    return createSimpleExpression(`''`, false, loc, true)
+    return createSimpleExpression(`''`, false, loc, ConstantTypes.CAN_HOIST)
   }
 }

packages/compiler-sfc/src/templateTransformSrcset.ts

@@ -1,5 +1,6 @@
 import path from 'path'
 import {
+  ConstantTypes,
   createCompoundExpression,
   createSimpleExpression,
   NodeTransform,
@@ -107,14 +108,14 @@ export const transformSrcset: NodeTransform = (
                     `_imports_${existingImportsIndex}`,
                     false,
                     attr.loc,
-                    true
+                    ConstantTypes.CAN_HOIST
                   )
                 } else {
                   exp = createSimpleExpression(
                     `_imports_${importsArray.length}`,
                     false,
                     attr.loc,
-                    true
+                    ConstantTypes.CAN_HOIST
                   )
                   context.imports.add({ exp, path })
                 }
@@ -125,7 +126,7 @@ export const transformSrcset: NodeTransform = (
                 `"${url}"`,
                 false,
                 attr.loc,
-                true
+                ConstantTypes.CAN_HOIST
               )
               compoundExpression.children.push(exp)
             }
@@ -140,7 +141,7 @@ export const transformSrcset: NodeTransform = (
           })
 
           const hoisted = context.hoist(compoundExpression)
-          hoisted.isRuntimeConstant = true
+          hoisted.constType = ConstantTypes.CAN_HOIST
 
           node.props[index] = {
             type: NodeTypes.DIRECTIVE,