feat(core): Add support for ESM config file

Author: ndcunningham

docs/generated/packages/eslint/generators/convert-to-flat-config.json

@@ -13,6 +13,12 @@
         "description": "Skip formatting files.",
         "default": false,
         "x-priority": "internal"
+      },
+      "eslintConfigFormat": {
+        "type": "string",
+        "description": "The format of the ESLint configuration file",
+        "enum": ["cjs", "mjs"],
+        "default": "mjs"
       }
     },
     "additionalProperties": false,

packages/angular/src/generators/ng-add/__snapshots__/migrate-from-angular-cli.spec.ts.snap

@@ -94,6 +94,7 @@ exports[`workspace move to nx layout should create nx.json 1`] = `
       "!{projectRoot}/karma.conf.js",
       "!{projectRoot}/.eslintrc.json",
       "!{projectRoot}/eslint.config.cjs",
+      "!{projectRoot}/eslint.config.mjs",
     ],
     "sharedGlobals": [],
   },
@@ -104,7 +105,7 @@ exports[`workspace move to nx layout should create nx.json 1`] = `
         "default",
         "{workspaceRoot}/.eslintrc.json",
         "{workspaceRoot}/.eslintignore",
-        "{workspaceRoot}/eslint.config.cjs",
+        "{workspaceRoot}/eslint.config.mjs",
       ],
     },
     "build": {