The setup binding property "projectNameList" is already declared.

In the provided document, the property `projectNameList` is indeed defined within the `setup` function of a Vue.js component. This can lead to conflicts if there are multiple declarations or if the same property is redeclared in different scopes.

Here’s a summary of where and how `projectNameList` is used:

1. **Initial Declaration**:

   const state = reactive({
     projectNameList: [],
     // other properties...
   });

2. **Usage in Methods**:
- `projectCodeSearch` method updates `projectNameList`:

     const projectCodeSearch = (value) => {
       getAction('/web/projectRecord/searchMainProject', {
         order: 'desc',
         pageNo: 1,
         pageSize: 100,
         keyword: value
       }).then(res => {
         state.projectNameList = res.result.map(item => ({
           id: item.id,
           value: item.projectCode,
           text: item.projectName
         }));
       });
     };

- `projectCodeChange` method uses `projectNameList`:

     const projectCodeChange = (value) => {
       state.queryParam.projectName_Code = value;
       const obj = state.projectNameList.find(item => item.id === value);
       if (obj) {
         state.exportParams.projectName = obj.text;
         state.queryParam.projectName = obj.text;
       } else {
         state.exportParams.projectName = '';
         state.queryParam.projectName = '';
       }
     };

To avoid any conflicts, ensure that `projectNameList` is only declared once and that it is not being redefined in another part of your code. If you need to use this property in multiple places, consider passing it as a prop or using a shared store (e.g., Vuex) to manage its state.

If you encounter an error indicating that `projectNameList` is already declared, double-check the following:
- Ensure that there are no duplicate declarations of `projectNameList` in your component.
- Verify that there are no other components or modules that might be injecting the same property.

By ensuring a single source of truth for `projectNameList`, you can avoid such issues and maintain clean, conflict-free code.