我正在使用Angular 4和webpack构建一个应用程序.
我的一个组件中有以下内容:
ngOnInit() {
require('/assets/js/regular-expresions.js');
}
当我尝试编译时,我得到:
C中的错误:/SRC/Sandbox/eat-sleep-code.com/src/app/content.component.ts(21,9):找不到名称'require'.
我已经运行npm install @types/node --save-dev
并更新了我的tsconfig.json,如下所示:
{
"compileOnSave": false,
"compilerOptions": {
"outDir": "./dist/out-tsc",
"baseUrl": "src",
"sourceMap": true,
"declaration": false,
"moduleResolution": "node",
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"target": "es5",
"types": [
"node"
],
"typeRoots": [
"node_modules/@types"
],
"lib": [
"es2016",
"dom"
]
}
}
但是,唉,同样的错误不断被抛出.有任何想法吗?
这是我的package.json:
{
"name": "eat-sleep-code.com",
"version": "0.0.0",
"license": "MIT",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "^4.0.1",
"@angular/common": "^4.0.0",
"@angular/compiler": "^4.0.0",
"@angular/core": "^4.0.0",
"@angular/forms": "^4.0.0",
"@angular/http": "^4.0.0",
"@angular/material": "^2.0.0-beta.3",
"@angular/platform-browser": "^4.0.0",
"@angular/platform-browser-dynamic": "^4.0.0",
"@angular/router": "^4.0.0",
"@types/node": "^6.0.69",
"angularfire2": "^2.0.0-beta.8",
"core-js": "^2.4.1",
"firebase": "^3.7.8",
"jquery": "^3.2.1",
"jquery-validation": "^1.16.0",
"ng2-gist": "^1.0.0",
"promise-polyfill": "^6.0.2",
"requirejs": "^2.3.3",
"rxjs": "^5.1.0",
"typescript": "^2.2.2",
"web-animations-js": "^2.2.4",
"webpack": "^2.4.1",
"zone.js": "^0.8.4"
},
"devDependencies": {
"@angular/cli": "1.0.0",
"@angular/compiler-cli": "^4.0.0",
"@types/jasmine": "2.5.38",
"@types/node": "^6.0.69",
"codelyzer": "~2.0.0",
"jasmine-core": "~2.5.2",
"jasmine-spec-reporter": "~3.2.0",
"karma": "~1.4.1",
"karma-chrome-launcher": "~2.0.0",
"karma-cli": "~1.0.1",
"karma-coverage-istanbul-reporter": "^0.2.0",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.1.0",
"ts-node": "~2.0.0",
"tslint": "~4.5.0",
"typescript": "^2.2.2",
"webpack": "^2.4.1"
}
}
小智..
31
尝试添加declare var require: any;
到顶部.
1> 小智..:
尝试添加declare var require: any;
到顶部.
2> David L..:
require()
由于一些原因不建议.一,它将"打破"webpack 2和2中树抖动的有效性,它将阻止正确的代码分裂.
一个更好的选择是使用webpack的实现System.import
:
System.import('/assets/js/regular-expresions.js').then(file => {
// perform additional interactions after the resource has been asynchronously fetched
});
为了满足Typescript编译器(如您所见),您需要System
通过声明它来告诉它这是一个可接受的变量:
declare var System: any;
如果您只打算引用一次,可以将此行添加到组件中,或者可以将其添加到typings.d.ts
类型定义文件中以在整个应用程序中使用它.请注意,如果更改打字文件,则需要重新启动ng serve
会话.
这在构建时满足编译器,它在构建系统的运行时被劫持,将调用修补到Webpack中System.import
.
反过来,Webpack将检查它是否有一个满足所请求文件的块,如果没有,它将动态创建一个脚本标签并将其插入头部,使用该async
属性加载文件,这就是这个案例.
加载文件后,将对其进行解析和执行.但是,如果要通过异步.then()
回调与其任何部分进行交互,则您的文件将需要导出您要调用的任何内容,例如:
export function test() {
console.log('we called test');
}
这会将.test()
函数公开给你的回调处理程序:
System.import('/assets/js/regular-expresions.js').then(file => {
file.test();
});