使用typescript开发angular模块(编写模块)

前言

之前在使用typescript开发angular模块(发布npm包)一文中基本晓得了怎么发布一个typescript写的npm包。但是离目标还有段距离。

开始开发模块

开发过程不是自己想了那么顺利，但是还是有点可取的地方。

安装依赖项目

"dependencies": {
    "@angular/common": "^5.0.2","@angular/core": "^5.0.2","moment": "^2.22.1","rxjs": "^5.5.2","zone.js": "^0.8.4"
  },"devDependencies": {
    "@types/core-js": "^0.9.35","typescript": "^2.8.1","typings": "^2.1.1"
  }

配置tsconfig.json文件

{
  "compilerOptions": {
    /* Basic Options */
    "typeRoots": [                 // 主要配置了这个
      "node_modules/@types"
    ],"lib": [                // 还有这个
      "es2017","dom"
    ],"target": "es5",/* Specify ECMAScript target version: 'ES3' (default),'ES5','ES2015','ES2016','ES2017','ES2018' or 'ESNEXT'. */
    //"module": "commonjs",/* Specify module code generation: 'none','commonjs','amd','system','umd','es2015',or 'ESNext'. */
    // "lib": [],/* Specify library files to be included in the compilation. */
    // "allowJs": true,/* Allow javascript files to be compiled. */
    // "checkJs": true,/* Report errors in .js files. */
    // "jsx": "preserve",/* Specify JSX code generation: 'preserve','react-native',or 'react'. */
    "declaration": true,/* Generates corresponding '.d.ts' file. */
    // "sourceMap": true,/* Generates corresponding '.map' file. */
    // "outFile": "./",/* Concatenate and emit output to single file. */
    // "outDir": "./",/* Redirect output structure to the directory. */
    // "rootDir": "./",/* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    // "removeComments": true,/* Do not emit comments to output. */
    // "noEmit": true,/* Do not emit outputs. */
    // "importHelpers": true,/* Import emit helpers from 'tslib'. */
    // "downlevelIteration": true,/* Provide full support for iterables in 'for-of',spread,and destructuring when targeting 'ES5' or 'ES3'. */
    // "isolatedModules": true,/* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
    /* Strict Type-Checking Options */
    "strict": true,/* Enable all strict type-checking options. */
    // "noImplicitAny": true,/* Raise error on expressions and declarations with an implied 'any' type. */
    // "strictNullChecks": true,/* Enable strict null checks. */
    // "strictFunctionTypes": true,/* Enable strict checking of function types. */
    // "strictPropertyInitialization": true,/* Enable strict checking of property initialization in classes. */
    // "noImplicitThis": true,/* Raise error on 'this' expressions with an implied 'any' type. */
    // "alwaysStrict": true,/* Parse in strict mode and emit "use strict" for each source file. */

    /* Additional Checks */
    // "noUnusedLocals": true,/* Report errors on unused locals. */
    // "noUnusedParameters": true,/* Report errors on unused parameters. */
    // "noImplicitReturns": true,/* Report error when not all code paths in function return a value. */
    // "noFallthroughCasesInSwitch": true,/* Report errors for fallthrough cases in switch statement. */

    /* Module Resolution Options */
    // "moduleResolution": "node",/* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    // "baseUrl": "./",/* Base directory to resolve non-absolute module names. */
    // "paths": {},/* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
    // "rootDirs": [],/* List of root folders whose combined content represents the structure of the project at runtime. */
    // "typeRoots": [],/* List of folders to include type definitions from. */
    // "types": [],/* Type declaration files to be included in compilation. */
    // "allowSyntheticDefaultImports": true,/* Allow default imports from modules with no default export. This does not affect code emit,just typechecking. */
    "esModuleInterop": true,/* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    // "preserveSymlinks": true,/* Do not resolve the real path of symlinks. */

    /* Source Map Options */
    // "sourceRoot": "./",/* Specify the location where debugger should locate TypeScript files instead of source locations. */
    // "mapRoot": "./",/* Specify the location where debugger should locate map files instead of generated locations. */
    // "inlineSourceMap": true,/* Emit a single file with source maps instead of having a separate file. */
    // "inlineSources": true,/* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */

    /* Experimental Options */
    "experimentalDecorators": true,/* Enables experimental support for ES7 decorators. */
    "emitDecoratorMetadata": true         /* Enables experimental support for emitting type metadata for decorators. */
  }
}

编写代码

像写普通的angular模块一样

index.ts

import { NgModule } from '@angular/core';
import {CommonModule} from "@angular/common";
import {BlogApiService} from "./provider";

@NgModule({
    imports: [
        CommonModule
    ],providers:    [ BlogApiService ],})
export class MzcNgApiModule { }

发布使用

似乎哪里没有配置正确，引入MzcNgApiModule 来使用时编译要报错。但是引入BlogApiService使用却很正常

在我们的angular项目中安装

npm i mzc-ng-api

能正常使用的情况如下

import { Injectable } from '@angular/core';
import {HttpClient} from '@angular/common/http';
import {BlogApiService} from  "mzc-ng-api/src/provider"
export * from "mzc-ng-api/src/provider"

@Injectable()
export class BlogService extends BlogApiService{
  constructor(protected http: HttpClient) {
    super(http)
  }
}

编译通过，在下面的地方能正确调用BlogApiService里的方法

import {BlogService,PreNoteDto,GetNoteDto} from "../blog.service";

export class NoteListComponent implements OnInit {
  preNoteList:PreNoteDto[]=[];
  loadMore = false;
  loading =false;
  key="";

  constructor(private router: Router,private blogService :BlogService
  ) { }

  ngOnInit() {
    this.getNoteList(true);
  }
  getNoteList(f=false){
    this.loading= true;
    if(f)this.preNoteList =[];
    const param = new GetNoteDto();
    param.key = this.key;
    param.SkipCount = this.preNoteList.length;
    this.blogService.GetNoteList(param).do(()=>{
      this.loading = false;
    }).subscribe(m=> {
      m.items.forEach((v,i)=>{
        v.content = marked(v.content);
        this.preNoteList.push(v);
      });
      this.loadMore = m.totalCount>this.preNoteList.length;
    });
  }
}

不能正常使用的方法如下

在app.module.ts中

import {MzcNgApiModule} from 'mzc-ng-api'

  imports: [
    RouterModule,MzcNgApiModule,BrowserModule,NgZorroAntdModule.forRoot(),RoutesModule,BrowserAnimationsModule
  ],

这样引入进来，还没有使用编译都会报错。错误内容几乎也时看不明白，先记录下来，日后慢慢解决。

未完待续

源码地址

https://github.com/yiershan/MZC-Ng-Api

（编辑：李大同）

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