Make resolveParser work like v2 (#13732)

src/main/parser.js

@@ -1,7 +1,13 @@
 import { ConfigError } from "../common/errors.js";
 
 function resolveParser({ plugins, parser }) {
-  for (const { parsers } of plugins) {
+  /*
+  Loop from end to allow plugins override builtin plugins,
+  this is how `resolveParser` works in v2.
+  This is a temporarily solution, see #13729
+  */
+  for (let index = plugins.length - 1; index >= 0; index--) {
+    const { parsers } = plugins[index];
     if (parsers && Object.hasOwn(parsers, parser)) {
       const parserOrParserInitFunction = parsers[parser];
 

tests/integration/__tests__/plugin-override-buitin-plugins.js

@@ -0,0 +1,17 @@
+import prettier from "../../config/prettier-entry.js";
+import createPlugin from "../../config/utils/create-plugin.cjs";
+
+test("plugins can override builtin plugins", async () => {
+  const outputWithoutPlugin = await prettier.format("foo()", {
+    parser: "babel",
+  });
+  const outputWithPlugin = await prettier.format("foo()", {
+    parser: "babel",
+    plugins: [
+      createPlugin({ name: "babel", print: () => "fake-babel-output" }),
+    ],
+  });
+
+  expect(outputWithoutPlugin).not.toBe(outputWithPlugin);
+  expect(outputWithPlugin).toBe("fake-babel-output\n");
+});