diff --git a/packages/compiler-sfc/src/parseComponent.ts b/packages/compiler-sfc/src/parseComponent.ts
index 39322a3efd4..65b858c9fc0 100644
--- a/packages/compiler-sfc/src/parseComponent.ts
+++ b/packages/compiler-sfc/src/parseComponent.ts
@@ -10,7 +10,6 @@ export const DEFAULT_FILENAME = 'anonymous.vue'
 const splitRE = /\r?\n/g
 const replaceRE = /./g
 const isSpecialTag = makeMap('script,style,template', true)
-const isNeedIndentLang = makeMap('pug,jade')
 
 export interface SFCCustomBlock {
   type: string
@@ -179,9 +178,13 @@ export function parseComponent(
       currentBlock.end = start
       let text = source.slice(currentBlock.start, currentBlock.end)
       if (
-        options.deindent ||
-        // certain langs like pug are indent sensitive, preserve old behavior
-        (currentBlock.lang && isNeedIndentLang(currentBlock.lang))
+        options.deindent === true ||
+        // by default, deindent unless it's script with default lang or ts
+        (options.deindent !== false &&
+          !(
+            currentBlock.type === 'script' &&
+            (!currentBlock.lang || currentBlock.lang === 'ts')
+          ))
       ) {
         text = deindent(text)
       }
diff --git a/packages/compiler-sfc/test/parseComponent.spec.ts b/packages/compiler-sfc/test/parseComponent.spec.ts
index 4624bb2040d..83f73483e0c 100644
--- a/packages/compiler-sfc/test/parseComponent.spec.ts
+++ b/packages/compiler-sfc/test/parseComponent.spec.ts
@@ -25,8 +25,7 @@ describe('Single File Component parser', () => {
       <div>
         <style>nested should be ignored</style>
       </div>
-    `,
-      { deindent: true }
+    `
     )
     expect(res.template!.content.trim()).toBe('<div>hi</div>')
     expect(res.styles.length).toBe(4)
@@ -76,8 +75,7 @@ describe('Single File Component parser', () => {
       </style>
     `
     const deindentDefault = parseComponent(content.trim(), {
-      pad: false,
-      deindent: true
+      pad: false
     })
     const deindentEnabled = parseComponent(content.trim(), {
       pad: false,
@@ -89,7 +87,9 @@ describe('Single File Component parser', () => {
     })
 
     expect(deindentDefault.template!.content).toBe('\n<div></div>\n')
-    expect(deindentDefault.script!.content).toBe('\nexport default {}\n')
+    expect(deindentDefault.script!.content).toBe(
+      '\n        export default {}\n      '
+    )
     expect(deindentDefault.styles[0].content).toBe('\nh1 { color: red }\n')
     expect(deindentEnabled.template!.content).toBe('\n<div></div>\n')
     expect(deindentEnabled.script!.content).toBe('\nexport default {}\n')
@@ -203,8 +203,7 @@ describe('Single File Component parser', () => {
       }
       </test>
       <custom src="./x.json"></custom>
-    `,
-      { deindent: true }
+    `
     )
     expect(res.customBlocks.length).toBe(4)