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vue+tsc+noEmit导致打包报TS类型错误问题及解决方法

作者：不叫猫先生

当我们新建vue3项目,package.json文件会自动给我添加一些配置选项,这写选项基本没有问题,但是在实际操作过程中,当项目越来越复杂就会出现问题,本文给大家分享vue+tsc+noEmit导致打包报TS类型错误问题及解决方法,感兴趣的朋友一起看看吧

背景

当我们新建vue3项目，package.json文件会自动给我添加一些配置选项，这写选项基本没有问题，但是在实际操作过程中，当项目越来越复杂就会出现问题。本文列举一个目前我遇到的一个问题：打包后报了一堆TS类型错误，怎么消除这些错误？

项目环境：Vue3 + Vite + TS

问题描述

当项目进行打包时候，突然发现终端有几十项报错

npm run build

详细报错信息如下：

src/view/testDemo/index.vue:6:9 - error TS2339: Property 'proxy' does not exist on type 'ComponentInternalInstance | null'.

6 const { proxy } = getCurrentInstance();
          ~~~~~

src/view/echarts/index.vue:7:9 - error TS2339: Property 'proxy' does not exist on type 'ComponentInternalInstance | null'.

7 const { proxy } = getCurrentInstance();
          ~~~~~

src/view/webRTC/index.vue:5:23 - error TS2322: Type 'string | number' is not assignable to type 'string | undefined'.
  Type 'number' is not assignable to type 'string'.

5                 <img :src=" item" alt="" />
                        ~~~

  node_modules/@vue/runtime-dom/dist/runtime-dom.d.ts:616:3
    616   src?: string
          ~~~
    The expected type comes from property 'src' which is declared here on type 'ElementAttrs<ImgHTMLAttributes>'

src/view/webRTC/index.vue:13:55 - error TS2322: Type '(deviceId: string) => Promise<void>' is not assignable to type '(evt: MouseEvent) => any'.
  Types of parameters 'deviceId' and 'evt' are incompatible.
    Type 'MouseEvent' is not assignable to type 'string'.

13             <el-button type="primary" size="default" @click="handleDeviceChange">
                                                         ~~~~~

src/layout/index.vue:14:22 - error TS2322: Type '{}' is not assignable to type 'IntrinsicAttributes & Partial<{ readonly disabled: boolean; readonly showTimeout: number; readonly hideTimeout: number; readonly popperAppendToBody: EpPropMergeType<BooleanConstructor, unknown, unknown>; readonly popperOffset: number; }> & Omit<...>'.
  Property 'index' is missing in type '{}' but required in type 'Omit<Readonly<ExtractPropTypes<{ readonly index: { readonly type: PropType<string>; readonly required: true; readonly validator: ((val: unknown) => boolean) | undefined; __epPropKey: true; }; readonly showTimeout: EpPropFinalized<...>; ... 8 more ...; readonly collapseOpenIcon: { ...; }; }>> & VNodeProps & AllowedCo...'.

14                     <el-sub-menu>
                        ~~~~~~~~~~~

  node_modules/element-plus/es/components/menu/index.d.ts:363:14
    363     readonly index: {
                     ~~~~~
    'index' is declared here.

src/view/testDemo/index.vue:27:32 - error TS2345: Argument of type 'HTMLElement | null' is not assignable to parameter of type 'HTMLElement'.
  Type 'null' is not assignable to type 'HTMLElement'.

27     var myChart = echarts.init(document.getElementById("trendLIne-content"));
                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/view/testDemo/index_.vue:41:40 - error TS2552: Cannot find name 'myData'. Did you mean 'data'?

41                                 value: myData[dataIndex],
                                          ~~~~~~

  src/view/testDemo/index_.vue:7:5
    7 let data = reactive([
          ~~~~
    'data' is declared here.

src/view/echarts/index.vue:40:32 - error TS2345: Argument of type 'HTMLElement | null' is not assignable to parameter of type 'HTMLElement'.
  Type 'null' is not assignable to type 'HTMLElement'.

40     var myChart = echarts.init(document.getElementById("trendLIne-content"));
                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

src/view/testDemo/index.vue:42:40 - error TS2552: Cannot find name 'myData'. Did you mean 'data'?

42                                 value: myData[dataIndex],
                                          ~~~~~~

  src/view/testDemo/index.vue:7:5
    7 let data = reactive([
          ~~~~
    'data' is declared here.

src/layout/index.vue:65:20 - error TS2339: Property '$fil' does not exist on type 'ComponentPublicInstance<{}, {}, {}, {}, {}, {}, {}, {}, false, ComponentOptionsBase<any, any, any, any, any, any, any, any, any, {}, {}, string>, {}>'.

65 console.log(proxy?.$fil, "proxy");
                      ~~~~

src/view/webRTC/index.vue:136:5 - error TS2322: Type '{ facingMode: string; }' is not assignable to type 'boolean'.

136     constraints.video = {
        ~~~~~~~~~~~~~~~~~

src/view/webRTC/index.vue:146:13 - error TS2304: Cannot find name 'ElMessage'.

146             ElMessage.success("切换成功");
                ~~~~~~~~~

src/view/webRTC/index.vue:150:13 - error TS2304: Cannot find name 'ElMessage'.

150             ElMessage.error("你的设备不支持切换前后摄像头");
                ~~~~~~~~~

src/view/webRTC/index.vue:156:28 - error TS2304: Cannot find name 'multiavatar'.

156     const blob = new Blob([multiavatar(val + new Date().getTime())], {
                               ~~~~~~~~~~~

src/view/testDemo/index.vue:168:9 - error TS1117: An object literal cannot have multiple properties with the same name.

168         grid: {
            ~~~~

src/directives/canvasMakeWaterMark.ts:30:3 - error TS18047: 'ctx' is possibly 'null'.

30   ctx.rotate((rotate * Math.PI) / 180);
     ~~~

src/directives/canvasMakeWaterMark.ts:31:3 - error TS18047: 'ctx' is possibly 'null'.

31   ctx.font = "16px normal";
     ~~~

src/directives/canvasMakeWaterMark.ts:32:3 - error TS18047: 'ctx' is possibly 'null'.

32   ctx.fillStyle = "rgba(180, 180, 180, 0.3)";
     ~~~

src/directives/canvasMakeWaterMark.ts:33:3 - error TS18047: 'ctx' is possibly 'null'.

33   ctx.textAlign = "left";
     ~~~

src/directives/canvasMakeWaterMark.ts:34:3 - error TS18047: 'ctx' is possibly 'null'.

34   ctx.textBaseline = "middle";
     ~~~

src/directives/canvasMakeWaterMark.ts:35:3 - error TS18047: 'ctx' is possibly 'null'.

35   ctx.fillText('请勿外传', canvas.width / 3, canvas.height / 2);
     ~~~

src/directives/canvasMakeWaterMark.ts:59:26 - error TS2554: Expected 0 arguments, but got 1.

59   const url = getDataUrl(binding);
                            ~~~~~~~

src/directives/canvasMakeWaterMark.ts:68:3 - error TS18047: 'parentElement' is possibly 'null'.

68   parentElement.setAttribute("style", "position: relative;");
     ~~~~~~~~~~~~~

src/directives/canvasMakeWaterMark.ts:71:3 - error TS18047: 'parentElement' is possibly 'null'.

71   parentElement.appendChild(waterMark);
     ~~~~~~~~~~~~~

src/directives/canvasMakeWaterMark.ts:81:23 - error TS18047: 'el.parentElement' is possibly 'null'.

81   const waterMarkEl = el.parentElement.querySelector(".water-mark");
                         ~~~~~~~~~~~~~~~~

src/directives/canvasMakeWaterMark.ts:87:25 - error TS18047: 'waterMarkEl' is possibly 'null'.

87       const currStyle = waterMarkEl.getAttribute("style");
                           ~~~~~~~~~~~

src/directives/canvasMakeWaterMark.ts:116:20 - error TS2345: Argument of type 'HTMLElement | null' is not assignable to parameter of type 'Node'.
  Type 'null' is not assignable to type 'Node'.

116   observer.observe(el.parentElement, {
                       ~~~~~~~~~~~~~~~~

截图图片如下：

分析

打包执行的是npm run build命令，那么具体执行了什么呢？我们查看package.json中配置项。

  "scripts": {
    "dev": "vite",
    "build": "vue-tsc --noEmit && vite build",
    "preview": "vite preview"
  },

可以发现在build时，执行了vue-tsc --noEmit && vite build，其中

所以可以看出了，在打包的时候编译器执行了TS类型检查，所以才报了一堆错，类型错误最终不会影响项目的正常运行

解决

根据上面分析，package.json中的"scripts"修改如下：

  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview"
  },

另外项目通常在编译时候，也会对我们引入的一些依赖包进行类型校验，我们并不需要这个操作，所以可以在tsconfig.json中设置如下：

 "compilerOptions": {
    "skipLibCheck": true
  },

设置后编译器不会检查库文件中的类型定义是否正确，也不会对库文件的使用进行类型检查。

再次打包就非常顺利～

到此这篇关于vue-tsc --noEmit导致打包报TS类型错误的文章就介绍到这了,更多相关vue-tsc --noEmit打包报TS错误内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！

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