fix: separate the /flat entry for compatibility

close #308

Author: JounQin

README.md

@@ -47,7 +47,10 @@ Note that this config _only_ turns rules _off,_ so it only makes sense using it
      <!-- prettier-ignore -->
      ```js
      import someConfig from "some-other-config-you-use";
-     import eslintConfigPrettier from "eslint-config-prettier";
+     // Note the `/flat` suffix here, the difference from default entry is that
+     // `/flat` added `name` property to the exported object to improve
+     // [config-inspector](https://eslint.org/blog/2024/04/eslint-config-inspector/) experience.
+     import eslintConfigPrettier from "eslint-config-prettier/flat";
 
      export default [
        someConfig,
@@ -81,7 +84,7 @@ With flat config, _you_ get to decide the plugin name! For example:
 
 ```js
 import typescriptEslint from "@typescript-eslint/eslint-plugin";
-import eslintConfigPrettier from "eslint-config-prettier";
+import eslintConfigPrettier from "eslint-config-prettier/flat";
 
 export default [
   {
@@ -153,7 +156,7 @@ For eslintrc, while the `"prettier"` config can disable problematic rules in `"s
 
 ```js
 import someConfig from "some-other-config-you-use";
-import eslintConfigPrettier from "eslint-config-prettier";
+import eslintConfigPrettier from "eslint-config-prettier/flat";
 
 export default [
   someConfig,
@@ -170,7 +173,7 @@ With the new ESLint “flat config” format, you can control what things overri
 
 ```js
 import someConfig from "some-other-config-you-use";
-import eslintConfigPrettier from "eslint-config-prettier";
+import eslintConfigPrettier from "eslint-config-prettier/flat";
 
 export default [
   someConfig,

flat.d.ts

@@ -0,0 +1,3 @@
+export * from "./index.js";
+
+export const name: "config-prettier";

flat.js

@@ -0,0 +1,4 @@
+const { rules } = require("./index.js");
+
+exports.name = "config-prettier";
+exports.rules = rules;

index.d.ts

@@ -1,3 +1 @@
-export const name: "config-prettier" | undefined;
-
 export const rules: Record<string, 0 | "off">;

index.js

@@ -1,15 +1,9 @@
 "use strict";
 
-const { version } = require("eslint/package.json");
-
 const includeDeprecated = !process.env.ESLINT_CONFIG_PRETTIER_NO_DEPRECATED;
 
 const specialRule = 0;
 
-if (+version.split(".")[0] >= 9) {
-  exports.name = "config-prettier";
-}
-
 exports.rules = {
   // The following rules can be used in some cases. See the README for more
   // information. These are marked with `0` instead of `"off"` so that a

package.json

@@ -17,6 +17,10 @@
       "types": "./index.d.ts",
       "default": "./index.js"
     },
+    "./flat": {
+      "types": "./flat.d.ts",
+      "default": "./flat.js"
+    },
     "./prettier": {
       "types": "./prettier.d.ts",
       "default": "./prettier.js"