chore(compiler-core/codegen): avoid generate indent spaces of empty lines. (#701)

packages/compiler-core/__tests__/__snapshots__/codegen.spec.ts.snap

@@ -72,14 +72,16 @@ return function render() {
 }"
 `;
 
-exports[`compiler: codegen assets 1`] = `
+exports[`compiler: codegen assets + temps 1`] = `
 "
 return function render() {
   with (this) {
     const _component_Foo = _resolveComponent(\\"Foo\\")
     const _component_bar_baz = _resolveComponent(\\"bar-baz\\")
     const _component_barbaz = _resolveComponent(\\"barbaz\\")
-const _directive_my_dir = _resolveDirective(\\"my_dir\\")
+    const _directive_my_dir_0 = _resolveDirective(\\"my_dir_0\\")
+    const _directive_my_dir_1 = _resolveDirective(\\"my_dir_1\\")
+    let _temp0, _temp1, _temp2
 
     return null
   }

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

@@ -119,10 +119,11 @@ describe('compiler: codegen', () => {
     expect(code).toMatchSnapshot()
   })
 
-  test('assets', () => {
+  test('assets + temps', () => {
     const root = createRoot({
       components: [`Foo`, `bar-baz`, `barbaz`],
-      directives: [`my_dir`]
+      directives: [`my_dir_0`, `my_dir_1`],
+      temps: 3
     })
     const { code } = generate(root, { mode: 'function' })
     expect(code).toMatch(
@@ -139,10 +140,16 @@ describe('compiler: codegen', () => {
       }("barbaz")\n`
     )
     expect(code).toMatch(
-      `const _directive_my_dir = _${
+      `const _directive_my_dir_0 = _${
         helperNameMap[RESOLVE_DIRECTIVE]
-      }("my_dir")\n`
+      }("my_dir_0")\n`
     )
+    expect(code).toMatch(
+      `const _directive_my_dir_1 = _${
+        helperNameMap[RESOLVE_DIRECTIVE]
+      }("my_dir_1")\n`
+    )
+    expect(code).toMatch(`let _temp0, _temp1, _temp2`)
     expect(code).toMatchSnapshot()
   })
 

packages/compiler-core/src/codegen.ts

@@ -216,11 +216,11 @@ export function generate(
           .map(s => `${helperNameMap[s]}: _${helperNameMap[s]}`)
           .join(', ')} } = _Vue`
       )
-      newline()
       if (ast.cached > 0) {
-        push(`const _cache = $cache`)
         newline()
+        push(`const _cache = $cache`)
       }
+      push(`\n`)
       newline()
     }
   } else if (!__BROWSER__ && !ssr) {
@@ -235,18 +235,24 @@ export function generate(
   // generate asset resolution statements
   if (ast.components.length) {
     genAssets(ast.components, 'component', context)
+    if (ast.directives.length || ast.temps > 0) {
+      newline()
+    }
   }
   if (ast.directives.length) {
     genAssets(ast.directives, 'directive', context)
+    if (ast.temps > 0) {
+      newline()
+    }
   }
   if (ast.temps > 0) {
     push(`let `)
     for (let i = 0; i < ast.temps; i++) {
       push(`${i > 0 ? `, ` : ``}_temp${i}`)
     }
-    push(`\n`)
   }
   if (ast.components.length || ast.directives.length || ast.temps) {
+    push(`\n`)
     newline()
   }
 
@@ -419,8 +425,6 @@ function genAssets(
     )
     if (i < assets.length - 1) {
       newline()
-    } else {
-      push(`\n`)
     }
   }
 }