解决“类型为“ Vue”的属性不存在”的错误

Davaid西里2020-04-07

我将Typescript与Vuejs一起使用来构建应用程序。我有几个要导入到Typescript（.ts）文件中的独立组件（.vue）文件。在Typescript文件中，我要从npm Vue库导入Vue，然后创建一个新的Vue以显示我的组件。我看到的错误是：

属性x在“ Vue”类型上不存在

我的构建系统是带有tsc的Webpack。为什么会出现此错误，我该如何解决？

主要

import Vue from 'vue';
import Competency from '../components/competency.vue';

new Vue({
  el: "#app",
  components: {
    'competency': Competency
  },
  data:{
    count: 0
  },
  methods:{
    initialize: function(){
      this.count = count + 1; // Errors here with Property count does not exist on type vue
    }
  }
})

tsconfig

{
  "compilerOptions": {
    // "allowJs": true,
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "lib": [
      "es2015",
      "dom",
      "es2015.promise"
    ],
    "module": "es2015",
    "moduleResolution": "node",
    "noEmitOnError": true,
    "noImplicitAny": false,
    //"outDir": "./build/",
    "removeComments": false,
    "sourceMap": true,
    "target": "es5"

  },
  "exclude": [
    "./node_modules",
    "wwwroot",
    "./Model"
  ],
  "include": [
    "./CCSEQ",
    "./WebResources"
  ]
}

webpack.config.js

const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
    entry: {
        Evaluations: './WebResources/js/main.ts'
    },
    devServer: {
        contentBase: './dist'
    },
    module: {
        rules: [{
                test: /\.ts$/,
                exclude: /node_modules|vue\/src/,
                loader: 'ts-loader',
                exclude: /node_modules/,
                options: {
                    appendTsSuffixTo: [/\.vue$/]
                }
            },
            {
                test: /\.vue$/,
                loader: 'vue-loader',
                options: {
                    esModule: true
                }
            },
            {
                test: /\.css$/,
                use: [
                    'style-loader',
                    'css-loader'
                ]
            },
            {
                test: /\.(png|svg|jpg|gif)$/,
                use: [
                    'file-loader'
                ]
            },
        ]
    },
    resolve: {
        extensions: [".tsx", ".ts", ".js"],
        alias: {
            'vue$': 'vue/dist/vue.esm.js'
        }
    },
    plugins: [
        new CleanWebpackPlugin(['dist']),
        new HtmlWebpackPlugin({
            filename: 'Evaluations.html',
            template: './WebResources/html/Evaluations.html'
        }), new HtmlWebpackPlugin({
            filename: 'ExpenseUpload.html',
            template: './WebResources/html/ExpenseUpload.html'
        }), new webpack.optimize.CommonsChunkPlugin({
            name: 'WebAPI'
        })
    ],
    output: {
        filename: '[name].bundle.js',
        path: path.resolve(__dirname, 'dist')
    }
}

神无2020/04/07 11:14:52

尝试使用Typescript的泛型。参见https://www.typescriptlang.org/docs/handbook/generics.html

new Vue<{ count: number }, { initialize: () => void }, {}, {}>({

  //...

  data:{
    count: 0
  },

  methods:{
    initialize: function() {
      this.count = count + 1;
    },
  }
});

ItachiEva2020/04/07 11:14:52

vue 2.8.2和Typescript 2.5.3出现了相同的错误。我通过将Vue实例保存在变量中然后为其指定类型来修复它。这样可以确保在使用options对象将其实例化时，TS将了解所有Vue属性。

var VueApp: any = Vue;

var App = new VueApp({
  el: "#app",
  data() {
     return {
        count: 0
     }
  },
  methods:{
    initialize() {
      this.count = count + 1; // Should work now
    }
  }
})

伽罗2020/04/07 11:14:52

您应该声明要导入的* .vue文件。

如：

vue文件导入.d.ts

declare module "*.vue" {
   import Vue from "vue";
   export default Vue;
}

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