Introduction to the configuration of using Typescript in Vue2 Vue-cli
This article mainly introduces the configuration introduction of using Typescript in Vue2 Vue-cli. It has a certain reference value. Now I share it with you. Friends in need can refer to it.
Vue is the three major front-end One of the frameworks has received 44,873 stars on github so far, which is enough to show that it has quietly become mainstream. The following article mainly introduces you to the relevant information about the configuration of using Typescript in Vue2 Vue-cli. Friends in need can refer to it.
Preface
Because the company's team is keen on the vue framework recently, and I want to practice typescript in the new project, so I started to work on vue ts The road to pitfalls... This article is intended to save time for friends who have the same idea as me. I won’t say much below. Let’s take a look at the configuration required to use Typescript in Vue2 Vue-cli. .
1. Preliminary configuration
First install the official plug-ins vue-class-component, vue-property-decorator, and configure webpack.
The webpack configuration is as follows:
Modify the entry file
entry: { app: './src/main.ts' }
resolve part:
extensions: ['.js', '.vue', '.json', '.ts', '.tsx']
Configure loader
{ test: /\.tsx?$/, loader: 'ts-loader', exclude: /node_modules/, options: { appendTsSuffixTo: [/\.vue$/], } }
Configure tsconfig.json
{ "include": [ "src/**/*" ], "exclude": [ "node_modules" ], "compilerOptions": { "allowSyntheticDefaultImports": true, "experimentalDecorators": true, "allowJs": true, "module": "es2015", "target": "es5", "moduleResolution": "node", "experimentalDecorators": true, "isolatedModules": true, "lib": [ "dom", "es5", "es2015.promise" ], "sourceMap": true, "pretty": true } }
2. Actual combat!
# Configuring the configuration is only the first step, running it in the project is the key.
Add lang='ts'
declare module "*.vue" { import Vue from 'vue'; export default Vue; }You can also configure .d.ts files for other non-js modules such as html (tell ts-loader to understand html as a string)
declare module "*.html" { let template: string; export default template; }After configuration, ts will be able to understand these modules
import { Component, Vue, Watch } from 'vue-property-decorator'
class HoverTopElem { leaveTop: number = -200 top: number = null height: number = null show(e) { this.top = e.target.getBoundingClientRect().top this.height = e.target.clientHeight } hidden() { this.top = this.leaveTop } } @Component({ name: 'sidebar', template: template, components: { sidebarItem } }) export default class Sidebar extends Vue { SidebarMenu: any = SidebarMenu hoverTopElem: HoverTopElem = new HoverTopElem() activeListItemName: string = null activeRouteItemRoute: string = null get _activeRouteItemRoute(): string { return this.$route.path } @Watch('_activeRouteItemRoute', { immediate: true }) onRouteChanged(val: any) { this.activeRouteItemRoute = val } changeList(param) { this.activeListItemName = param } changeRoute(param) { this.activeRouteItemRoute = param } }Metadata is written in the @Component configuration, such as name, components used, etc. Then let’s talk about how to use each instance attribute method used in vue before: data: This is the most commonly used, like the SidebarMenu above (a total of 4 are declared here). Note that the variables declared here must be assigned a value. If not, it will be null, not undefined, otherwise the data will not be responsive. Therefore, the properties in the HoverTopElem class must also have initial values, otherwise these properties will not be responsive.computed: Here is the get function. Note that tsconfig.jsonp is not configured with "target": "es5" and an error will be reported hereprop: There is a Prop module in vue-property-decorator. You can also declare this prop in the metadata, and then declare this variable in the class. I personally recommend the first onewatch: Watch module in vue-property-decoratormethods: Just write the method directly in the class like data (be careful not to have the same name as the cycle hook)
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