feature: babel-core: add cloneInputAst (#10241)

Co-authored-by: coderaiser <coderaiser@cloudcmd.io>

packages/babel-core/test/api.js

@@ -214,6 +214,31 @@ describe("api", function () {
     );
   });
 
+  it("transformFromAst should mutate the AST when cloneInputAst is false", function () {
+    const program = "const identifier = 1";
+    const node = parse(program);
+    const { code } = transformFromAst(node, program, {
+      cloneInputAst: false,
+      plugins: [
+        function () {
+          return {
+            visitor: {
+              Identifier: function (path) {
+                path.node.name = "replaced";
+              },
+            },
+          };
+        },
+      ],
+    });
+
+    expect(code).toBe("const replaced = 1;");
+    expect(node.program.body[0].declarations[0].id.name).toBe(
+      "replaced",
+      "original ast should have been mutated",
+    );
+  });
+
   it("options throw on falsy true", function () {
     return expect(function () {
       transform("", {

packages/babel-core/test/config-chain.js

@@ -984,6 +984,7 @@ describe("buildConfigChain", function () {
       passPerPreset: false,
       plugins: [],
       presets: [],
+      cloneInputAst: true,
     });
     const realEnv = process.env.NODE_ENV;
     const realBabelEnv = process.env.BABEL_ENV;