fix: prevent from mutating original sfc, fixes #243

package.json

@@ -36,6 +36,7 @@
     "fs-extra": "^9.1.0",
     "is-binary-path": "^2.1.0",
     "joycon": "^3.0.1",
+    "lodash.clonedeep": "^4.5.0",
     "postcss": "^8.2.10",
     "postcss-load-config": "^3.0.1",
     "resolve": "^1.20.0",
@@ -49,6 +50,7 @@
     "@types/fs-extra": "^8.0.0",
     "@types/is-binary-path": "^2.1.0",
     "@types/jest": "^26.0.14",
+    "@types/lodash.clonedeep": "^4.5.6",
     "@types/node-sass": "^4.11.0",
     "@types/stringify-attributes": "^2.0.0",
     "@typescript-eslint/eslint-plugin": "^4.22.0",

src/index.ts

@@ -6,6 +6,7 @@ import isBinaryPath from 'is-binary-path'
 import createDebug from 'debug'
 import { parse } from '@vue/compiler-sfc'
 import glob from 'fast-glob'
+import cloneDeep from 'lodash.clonedeep'
 import {
   replaceContants,
   cssExtensionsRe,
@@ -19,7 +20,7 @@ import { writeSFC } from './writeSFC'
 
 const debug = createDebug('vue-compile:cli')
 
-type OptionContants = Record<string, string | boolean | number>;
+type OptionContants = Record<string, string | boolean | number>
 
 interface InputOptions {
   config?: boolean | string
@@ -127,9 +128,11 @@ class VueCompile extends EventEmitter {
 
     ctx.transformTypeScript = !this.options.preserveTsBlock
 
-    const sfc = parse(source, {
-      filename: input,
-    })
+    const sfc = cloneDeep(
+      parse(source, {
+        filename: input,
+      }),
+    )
 
     const script = await compileScript(sfc.descriptor.script, ctx)
     const scriptSetup = await compileScript(sfc.descriptor.scriptSetup, ctx)
@@ -159,6 +162,7 @@ class VueCompile extends EventEmitter {
       cwd: input,
       ignore: ['**/node_modules/**'].concat(exclude),
     })
+
     await Promise.all(
       files.map(async (file: string) => {
         return this.normalizeFile(

yarn.lock

@@ -1294,6 +1294,18 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.3.tgz#bdfd69d61e464dcc81b25159c270d75a73c1a636"
   integrity sha512-Il2DtDVRGDcqjDtE+rF8iqg1CArehSK84HZJCT7AMITlyXRBpuPhqGLDQMowraqqu1coEaimg4ZOqggt6L6L+A==
 
+"@types/lodash.clonedeep@^4.5.6":
+  version "4.5.6"
+  resolved "https://registry.yarnpkg.com/@types/lodash.clonedeep/-/lodash.clonedeep-4.5.6.tgz#3b6c40a0affe0799a2ce823b440a6cf33571d32b"
+  integrity sha512-cE1jYr2dEg1wBImvXlNtp0xDoS79rfEdGozQVgliDZj1uERH4k+rmEMTudP9b4VQ8O6nRb5gPqft0QzEQGMQgA==
+  dependencies:
+    "@types/lodash" "*"
+
+"@types/lodash@*":
+  version "4.14.172"
+  resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.172.tgz#aad774c28e7bfd7a67de25408e03ee5a8c3d028a"
+  integrity sha512-/BHF5HAx3em7/KkzVKm3LrsD6HZAXuXO1AJZQ3cRRBZj4oHZDviWPYu0aEplAqDFNHZPW6d3G7KN+ONcCCC7pw==
+
 "@types/node-sass@^4.11.0":
   version "4.11.0"
   resolved "https://registry.yarnpkg.com/@types/node-sass/-/node-sass-4.11.0.tgz#b0372075546e83f39df52bd37359eab00165a04d"