error 'submitForm' is assigned a value but never used. but 'submitForm' is used in template

[StrongerLph]

Checklist

• [√ ] I have tried restarting my IDE and the issue persists.
• [√ ] I have read the FAQ and my problem is not listed.

Tell us about your environment

• ESLint version: 9.6.0
• eslint-plugin-vue version: 9.27.0
• Vue version: 3.4.21
• Node version: v18.16.0
• Operating System: windows

Please show your full configuration:

import globals from 'globals';
import pluginJs from '@eslint/js';
import tseslint from 'typescript-eslint';
import pluginVue from 'eslint-plugin-vue';
import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
import { FlatCompat } from '@eslint/eslintrc';
import path from 'path';
import { fileURLToPath } from 'url';

// mimic CommonJS variables -- not needed if using CommonJS
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const compat = new FlatCompat({
  baseDirectory: __dirname,
});

export default [
  {
    files: ['**/*.{js,jsx,mjs,cjs,ts,tsx,vue}'],
    ignores: ['.vscode', '.husky', '**/node_modules/', 'dist', 'dist-electron'],
    languageOptions: {
      parser: 'vue-eslint-parser',
      parserOptions: {
        parser: '@typescript-eslint/parser',
        ecmaVersion: 'latest',
        sourceType: 'module',
        ecmaFeatures: {
          jsx: true,
        },
      },
      globals: { ...globals.browser, ...globals.node },
    },
  },
  pluginJs.configs.recommended,
  ...tseslint.configs.recommended,
  ...pluginVue.configs['flat/essential'],
  ...compat.extends('eslint-config-standard'),
  ...compat.extends('./.eslintrc-auto-import.json'),
  eslintPluginPrettierRecommended,
  {
    rules: {
      '@typescript-eslint/no-explicit-any': 'off',
      'vue/multi-word-component-names': 0,
    },
  },
];

What did you do?

<!-- eslint-disable no-irregular-whitespace -->
<template>
  <div class="register-container">
    <el-card class="register-card">
      <el-form ref="registerFormRef" :model="registerForm" :rules="registerFormRules" label-width="100px">
        <el-form-item label="用户名" prop="username">
          <el-input v-model="registerForm.username"></el-input>
        </el-form-item>
        <el-form-item label="密　码" prop="password">
          <el-input type="password" v-model="registerForm.password"></el-input>
        </el-form-item>
        <el-form-item label="邮　箱" prop="email">
          <el-input v-model="registerForm.email"></el-input>
        </el-form-item>
      </el-form>
      <div class="register-form-btns">
        <el-button type="primary" @click="submitForm">注　册</el-button>
        <el-button @click="backToLogin">返回登录</el-button>
      </div>
    </el-card>
  </div>
</template>

<script setup lang="ts">
import router from '@/router';
import { UserRegisterType, register } from '@/api/user';
import type { FormInstance, FormRules } from 'element-plus';

const registerFormRef = ref<FormInstance>();

const registerForm = ref<UserRegisterType>({
  username: '',
  password: '',
  email: '',
});

const registerFormRules: FormRules<UserRegisterType> = {
  email: [
    { required: true, message: '请输入邮箱账号', trigger: 'blur' },
    { type: 'email', message: '请输入正确的邮箱格式', trigger: 'blur' },
  ],
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' },
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    { min: 6, max: 20, message: '长度在 6 到 20 个字符', trigger: 'blur' },
  ],
};

const submitForm = async () => {
  registerFormRef.value?.validate(async (valid: boolean) => {
    if (!valid) return;
    await register(registerForm.value);
  });
};

const backToLogin = () => {
  router.replace('/login');
};
</script>

<style lang="scss" scoped>
.register-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;

  .register-card {
    width: 400px;

    .register-form-btns {
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-top: 20px;

      .el-button {
        width: 100px;
      }

      .el-button:last-child {
        margin-top: 10px;
        margin-left: 0;
      }
    }
  }
}
</style>

What did you expect to happen?
Correctly identify whether the variable has been referenced

What actually happened?

Repository to reproduce this issue

[FloEdelmann]

Is this still an issue with the latest version of eslint-plugin-vue? Could you please provide a repo to help us debug this issue?

[StrongerLph]

Is this still an issue with the latest version of eslint-plugin-vue? Could you please provide a repo to help us debug this issue?

Yes, this problem still exists, even when I update to the latest version. I had to turn off the no-unused-vars check to avoid reporting errors. But I think it's normal for plug-ins to recognize variables or functions that have been used, and not prompt a no-unused-vars error on variables or functions that have been used by templates.You can use this repo to reproduce the situation:

Just comment out this configuration and the problem will appear：

[FloEdelmann]

Can you please link the repo?

[StrongerLph]

Can you please link the repo?

sorry，I forgot to post the address. here

[waynzh]

The error doesn't seem to be related to eslint-plugin-vue.
It looks like a problem with ...compat.extends('eslint-config-standard'). After commenting out this part of the code, the error was gone.

UPDATE:
After some digging, it's an issue with the config order. typescript-eslint disables the no-unused-vars rule, but it's then enabled by a later configuration. Here's an explanation of why the rule is disabled.

You can try adjusting the order, for example, by placing typescript-eslint after compat to debug the configuration issue.