From e8e3ec6ca7392e43975c75b56eaaa711d5ea9410 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Thu, 23 Nov 2023 23:18:23 +0800
Subject: [PATCH] perf(compiler-sfc): remove magic-string trim on script

magic-string's trim method uses a regex check for aborting which turns
out to be extremely expensive - it cna take up to 10% time in total SFC
compilation! The usage here is purely aesthetic so simply removing it
for a big perf gain is well worth it.
---
 .../__snapshots__/compileScript.spec.ts.snap  | 44 +++++++++++++------
 .../__snapshots__/defineEmits.spec.ts.snap    |  3 +-
 .../__snapshots__/defineExpose.spec.ts.snap   |  3 +-
 .../__snapshots__/defineOptions.spec.ts.snap  |  6 ++-
 .../definePropsDestructure.spec.ts.snap       | 15 ++++---
 .../__snapshots__/hoistStatic.spec.ts.snap    | 15 ++++---
 packages/compiler-sfc/src/compileScript.ts    |  2 -
 7 files changed, 58 insertions(+), 30 deletions(-)

diff --git a/packages/compiler-sfc/__tests__/__snapshots__/compileScript.spec.ts.snap b/packages/compiler-sfc/__tests__/__snapshots__/compileScript.spec.ts.snap
index f4f44284b..4cc3cf611 100644
--- a/packages/compiler-sfc/__tests__/__snapshots__/compileScript.spec.ts.snap
+++ b/packages/compiler-sfc/__tests__/__snapshots__/compileScript.spec.ts.snap
@@ -14,7 +14,8 @@ return { a }
 `;
 
 exports[`SFC analyze <script> bindings > auto name inference > do not overwrite manual name (call) 1`] = `
-"import { defineComponent } from 'vue'
+"
+        import { defineComponent } from 'vue'
         const __default__ = defineComponent({
           name: 'Baz'
         })
@@ -30,7 +31,8 @@ return { a, defineComponent }
 `;
 
 exports[`SFC analyze <script> bindings > auto name inference > do not overwrite manual name (object) 1`] = `
-"const __default__ = {
+"
+        const __default__ = {
           name: 'Baz'
         }
         
@@ -45,7 +47,8 @@ return { a }
 `;
 
 exports[`SFC compile <script setup> > <script> and <script setup> co-usage > export call expression as default 1`] = `
-"function fn() {
+"
+      function fn() {
         return \\"hello, world\\";
       }
       const __default__ = fn();
@@ -63,7 +66,8 @@ return { fn }
 `;
 
 exports[`SFC compile <script setup> > <script> and <script setup> co-usage > keep original semi style 1`] = `
-"export default {
+"
+export default {
   props: ['item'],
   emits: ['change'],
   setup(__props, { expose: __expose, emit: __emit }) {
@@ -535,7 +539,8 @@ return { get a() { return a }, set a(v) { a = v } }
 `;
 
 exports[`SFC compile <script setup> > async/await detection > should ignore await inside functions 1`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
   __expose();
 async function foo() { await bar }
@@ -546,7 +551,8 @@ return { foo }
 `;
 
 exports[`SFC compile <script setup> > async/await detection > should ignore await inside functions 2`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
   __expose();
 const foo = async () => { await bar }
@@ -557,7 +563,8 @@ return { foo }
 `;
 
 exports[`SFC compile <script setup> > async/await detection > should ignore await inside functions 3`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
   __expose();
 const obj = { async method() { await bar }}
@@ -568,7 +575,8 @@ return { obj }
 `;
 
 exports[`SFC compile <script setup> > async/await detection > should ignore await inside functions 4`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
   __expose();
 const cls = class Foo { async method() { await bar }}
@@ -618,7 +626,8 @@ return { a }
 `;
 
 exports[`SFC compile <script setup> > binding analysis for destructure 1`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
   __expose();
 
@@ -838,7 +847,9 @@ return { msg, useCssVars, ref }
 `;
 
 exports[`SFC compile <script setup> > imports > import dedupe between <script> and <script setup> 1`] = `
-"import { x } from './x'
+"
+        
+        import { x } from './x'
         
 export default {
   setup(__props, { expose: __expose }) {
@@ -902,7 +913,9 @@ return { ref }
 `;
 
 exports[`SFC compile <script setup> > imports > should support module string names syntax 1`] = `
-"import { \\"😏\\" as foo } from './foo'
+"
+      
+        import { \\"😏\\" as foo } from './foo'
       
 export default {
   setup(__props, { expose: __expose }) {
@@ -1189,7 +1202,8 @@ return (_ctx, _cache) => {
 `;
 
 exports[`SFC compile <script setup> > inlineTemplate mode > with defineExpose() 1`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
 
         const count = ref(0)
@@ -1352,7 +1366,8 @@ return { a }
 `;
 
 exports[`SFC genDefaultAs > <script> + <script setup> 1`] = `
-"const __default__ = {}
+"
+      const __default__ = {}
       
 const _sfc_ = /*#__PURE__*/Object.assign(__default__, {
   setup(__props, { expose: __expose }) {
@@ -1367,7 +1382,8 @@ return { a }
 `;
 
 exports[`SFC genDefaultAs > <script> + <script setup> 2`] = `
-"const __default__ = {}
+"
+      const __default__ = {}
       
 const _sfc_ = /*#__PURE__*/Object.assign(__default__, {
   setup(__props, { expose: __expose }) {
diff --git a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineEmits.spec.ts.snap b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineEmits.spec.ts.snap
index 78a9834d2..3c6425009 100644
--- a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineEmits.spec.ts.snap
+++ b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineEmits.spec.ts.snap
@@ -1,7 +1,8 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
 exports[`defineEmits > basic usage 1`] = `
-"export default {
+"
+export default {
   emits: ['foo', 'bar'],
   setup(__props, { expose: __expose, emit: __emit }) {
   __expose();
diff --git a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineExpose.spec.ts.snap b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineExpose.spec.ts.snap
index d72726460..f8754f8a9 100644
--- a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineExpose.spec.ts.snap
+++ b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineExpose.spec.ts.snap
@@ -16,7 +16,8 @@ return { n, get x() { return x } }
 `;
 
 exports[`defineExpose() 1`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
 
 __expose({ foo: 123 })
diff --git a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineOptions.spec.ts.snap b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineOptions.spec.ts.snap
index 47f3cef0a..9cb168be1 100644
--- a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineOptions.spec.ts.snap
+++ b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/defineOptions.spec.ts.snap
@@ -1,7 +1,8 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
 exports[`defineOptions() > basic usage 1`] = `
-"export default /*#__PURE__*/Object.assign({ name: 'FooApp' }, {
+"
+export default /*#__PURE__*/Object.assign({ name: 'FooApp' }, {
   setup(__props, { expose: __expose }) {
   __expose();
 
@@ -14,7 +15,8 @@ return {  }
 `;
 
 exports[`defineOptions() > empty argument 1`] = `
-"export default {
+"
+export default {
   setup(__props, { expose: __expose }) {
   __expose();
 
diff --git a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/definePropsDestructure.spec.ts.snap b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/definePropsDestructure.spec.ts.snap
index c31005c40..8b957a862 100644
--- a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/definePropsDestructure.spec.ts.snap
+++ b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/definePropsDestructure.spec.ts.snap
@@ -177,7 +177,8 @@ return () => {}
 `;
 
 exports[`sfc reactive props destructure > defineProps/defineEmits in multi-variable declaration (full removal) 1`] = `
-"export default {
+"
+export default {
   props: ['item'],
   emits: ['a'],
   setup(__props, { emit: __emit }) {
@@ -192,7 +193,8 @@ return () => {}
 `;
 
 exports[`sfc reactive props destructure > multi-variable declaration 1`] = `
-"export default {
+"
+export default {
   props: ['item'],
   setup(__props) {
 
@@ -205,7 +207,8 @@ return () => {}
 `;
 
 exports[`sfc reactive props destructure > multi-variable declaration fix #6757  1`] = `
-"export default {
+"
+export default {
   props: ['item'],
   setup(__props) {
 
@@ -218,7 +221,8 @@ return () => {}
 `;
 
 exports[`sfc reactive props destructure > multi-variable declaration fix #7422 1`] = `
-"export default {
+"
+export default {
   props: ['item'],
   setup(__props) {
 
@@ -250,7 +254,8 @@ return (_ctx, _cache) => {
 `;
 
 exports[`sfc reactive props destructure > nested scope 1`] = `
-"export default {
+"
+export default {
   props: ['foo', 'bar'],
   setup(__props) {
 
diff --git a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/hoistStatic.spec.ts.snap b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/hoistStatic.spec.ts.snap
index 307b3e212..5ab70d9b6 100644
--- a/packages/compiler-sfc/__tests__/compileScript/__snapshots__/hoistStatic.spec.ts.snap
+++ b/packages/compiler-sfc/__tests__/compileScript/__snapshots__/hoistStatic.spec.ts.snap
@@ -1,7 +1,8 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
 exports[`sfc hoist static > should enable when only script setup 1`] = `
-"const foo = 'bar'
+"
+    const foo = 'bar'
     
 export default {
   setup(__props) {
@@ -91,7 +92,8 @@ return () => {}
 `;
 
 exports[`sfc hoist static > should not hoist a function or class 1`] = `
-"export default {
+"
+export default {
   setup(__props) {
 
     const fn = () => {}
@@ -105,7 +107,8 @@ return () => {}
 `;
 
 exports[`sfc hoist static > should not hoist a object or array 1`] = `
-"export default {
+"
+export default {
   setup(__props) {
 
     const obj = { foo: 'bar' }
@@ -118,7 +121,8 @@ return () => {}
 `;
 
 exports[`sfc hoist static > should not hoist a variable 1`] = `
-"export default {
+"
+export default {
   setup(__props) {
 
     let KEY1 = 'default value'
@@ -133,7 +137,8 @@ return () => {}
 `;
 
 exports[`sfc hoist static > should not hoist when disabled 1`] = `
-"export default {
+"
+export default {
   setup(__props) {
 
     const foo = 'bar'
diff --git a/packages/compiler-sfc/src/compileScript.ts b/packages/compiler-sfc/src/compileScript.ts
index 867280c6f..b3f5a1414 100644
--- a/packages/compiler-sfc/src/compileScript.ts
+++ b/packages/compiler-sfc/src/compileScript.ts
@@ -986,8 +986,6 @@ export function compileScript(
     )
   }
 
-  ctx.s.trim()
-
   return {
     ...scriptSetup,
     bindings: ctx.bindingMetadata,