升级到Angular4后找不到名称'require'

Question

我想在我的Angular项目中使用Chart.js.在以前的Angular2版本中,我使用'chart.loader.ts'做得很好,它有:

export const { Chart } = require('chart.js');

然后在组件代码中我就是

import { Chart } from './chart.loader';

但升级到cli 1.0.0和Angular 4之后,我收到错误:"找不到名称'require'".

要重现错误:

ng new newapp
cd newapp
npm install chart.js --save
echo "export const { Chart } = require('chart.js');" >> src/app/chart.loader.ts
ng serve

在我的'tsconfig.json'中,我有

"typeRoots": [
  "node_modules/@types"
],

在'node_modules/@types/node/index.d.ts'中有:

declare var require: NodeRequire;

所以我很困惑.

顺便说一句,我经常遇到警告:

[tslint] The selector of the component "OverviewComponent" should have prefix "app"(component-selector)

虽然我在'.angular-cli.json'中设置了"前缀":"".可能是因为从'angular-cli.json'改为'.angular-cli.json'的原因？

Answer 1

问题(如获取错误TS2304:找不到名称'require'的原型中所述)是未安装节点的类型定义.

对于一个预计的genen with @angular/cli 1.x,具体步骤应该是:

第1步:

@types/node使用以下任一方法安装:

- npm install --save @types/node
- yarn add @types/node -D

第2步:编辑你的src/tsconfig.app.json文件并添加以下代替空"types": [],应该已经存在:

...
"types": [ "node" ],
"typeRoots": [ "../node_modules/@types" ]
...

如果我错过任何内容,请发表评论,我会编辑我的答案.

Answer 2

最后我得到了解决方案,检查我的App模块文件:

import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { MaterialModule } from '@angular/material';
import 'hammerjs';
import { ChartModule } from 'angular2-highcharts';
import * as highcharts from 'highcharts';
import { HighchartsStatic } from 'angular2-highcharts/dist/HighchartsService';

import { AppRouting } from './app.routing';
import { AppComponent } from './app.component';

declare var require: any;


export function highchartsFactory() {
      const hc = require('highcharts');
      const dd = require('highcharts/modules/drilldown');
      dd(hc);

      return hc;
}

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    AppRouting,
    BrowserAnimationsModule,
    MaterialModule,
    ChartModule
  ],
  providers: [{
      provide: HighchartsStatic,
      useFactory: highchartsFactory
    }],
  bootstrap: [AppComponent]
})
export class AppModule { }

请注意declare var require: any;上面的代码.

Answer 3

仍然不确定答案,但可能的解决方法是

import * as Chart from 'chart.js';

Answer 4

至于我,使用VSCode和Angular 5,只需要在tsconfig.app.json中为类型添加"node".保存,然后重新启动服务器.

{
    "compilerOptions": {
    ..
    "types": [
      "node"
    ]
  }
  ..
}

一个奇怪的事情是,这个问题"找不到要求(",在用ts节点进行切换时不会发生

Answer 5

Will work in Angular 7+

I was facing the same issue, I was adding

"types": ["node"]

to tsconfig.json of root folder.

There was one more tsconfig.app.json under src folder and I got solved this by adding

"types": ["node"]

to tsconfig.app.json file under compilerOptions

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "types": ["node"]  ----------------------< added node to the array
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}