希望有人能指出我在正确的方向吗？我正在尝试将underscore.js添加到我的AngularJS2应用程序中，但无法通过错误消息“无法找到模块'下划线'”。
我执行了：npm install underscore --save并且它添加了对我的package.json文件的引用：
{
"name": "angular-quickstart",
"version": "1.0.0",
"description": "QuickStart package.json from the documentation, supplemented with testing support",
"scripts": {
"start": "tsc && concurrently \"tsc -w\" \"lite-server\" ",
"docker-build": "docker build -t ng2-quickstart .",
"docker": "npm run docker-build && docker run -it --rm -p 3000:3000 -p 3001:3001 ng2-quickstart",
"pree2e": "npm run webdriver:update",
"e2e": "tsc && concurrently \"http-server -s\" \"protractor protractor.config.js\" --kill-others --success first",
"lint": "tslint ./app/**/*.ts -t verbose",
"lite": "lite-server",
"test": "tsc && concurrently \"tsc -w\" \"karma start karma.conf.js\"",
"test-once": "tsc && karma start karma.conf.js --single-run",
"tsc": "tsc",
"tsc:w": "tsc -w",
"webdriver:update": "webdriver-manager update"
},
"keywords": [],
"author": "",
"licenses": [
{
"type": "MIT",
"url": "https://github.com/angular/angular.io/blob/master/LICENSE"
}
],
"dependencies": {
"@angular/common": "~2.1.1",
"@angular/compiler": "~2.1.1",
"@angular/core": "~2.1.1",
"@angular/forms": "~2.1.1",
"@angular/http": "~2.1.1",
"@angular/material": "^2.0.0-alpha.9-3",
"@angular/platform-browser": "~2.1.1",
"@angular/platform-browser-dynamic": "~2.1.1",
"@angular/router": "~3.1.1",
"@angular/upgrade": "~2.1.1",
"ag-grid": "6.2.x",
"ag-grid-ng2": "6.2.x",
"angular-in-memory-web-api": "~0.1.13",
"angular2-cool-storage": "^1.1.0",
"bootstrap": "^3.3.7",
"core-js": "^2.4.1",
"ng2-bootstrap": "^1.1.16",
"reflect-metadata": "^0.1.8",
"rxjs": "5.0.0-beta.12",
"systemjs": "0.19.39",
"underscore": "^1.8.3",
"zone.js": "^0.6.26"
},
"devDependencies": {
"concurrently": "^3.1.0",
"lite-server": "^2.2.2",
"typescript": "^2.0.3",
"canonical-path": "0.0.2",
"http-server": "^0.9.0",
"tslint": "^3.15.1",
"lodash": "^4.16.2",
"jasmine-core": "~2.5.2",
"karma": "^1.3.0",
"karma-chrome-launcher": "^2.0.0",
"karma-cli": "^1.0.1",
"karma-htmlfile-reporter": "^0.3.4",
"karma-jasmine": "^1.0.2",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "^4.0.9",
"rimraf": "^2.5.4",
"@types/core-js": "^0.9.34",
"@types/node": "^6.0.45",
"@types/jasmine": "^2.5.35",
"@types/selenium-webdriver": "^2.53.32"
},
"repository": {}
}
这是我的systemjs.config.js文件，你可以看到我在那里添加了引用：
/**
* System configuration for Angular samples
* Adjust as necessary for your application needs.
*/
(function (global) {
System.config({
paths: {
// paths serve as alias
'npm:': 'node_modules/'
},
// map tells the System loader where to look for things
map: {
// our app is within the app folder
app: 'app',
// angular bundles
'@angular/core': 'npm:@angular/core/bundles/core.umd.js',
'@angular/common': 'npm:@angular/common/bundles/common.umd.js',
'@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
'@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
'@angular/http': 'npm:@angular/http/bundles/http.umd.js',
'@angular/router': 'npm:@angular/router/bundles/router.umd.js',
'@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
'@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',
// other libraries
'rxjs': 'npm:rxjs',
'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
'ag-grid-ng2': 'node_modules/ag-grid-ng2',
'ag-grid': 'node_modules/ag-grid',
'ag-grid-enterprise': 'node_modules/ag-grid-enterprise',
'@angular/material': 'npm:@angular/material/material.umd.js',
'angular2-cool-storage': 'npm:angular2-cool-storage',
'underscore': 'npm:underscore',
},
// packages tells the System loader how to load when no filename and/or no extension
packages: {
app: { main: './main.js', defaultExtension: 'js' },
rxjs: { defaultExtension: 'js' },
'angular-in-memory-web-api': { main: './index.js', defaultExtension: 'js' },
lib: { format: 'register', defaultExtension: 'js' },
'ag-grid-ng2': { defaultExtension: "js" },
'ag-grid': { defaultExtension: "js" },
'angular2-cool-storage': { main: './cool-storage.js', defaultExtension: 'js' },
'underscore': { main: './underscore.js', defaultExtension: 'js' },
map: {
'ag-grid-ng2': 'node_modules/ag-grid-ng2',
'ag-grid': 'node_modules/ag-grid'
}
}
});
})(this);
这是我的tsconfig.json文件：
{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true,
"typeRoots": [ "./node_modules/@types/" ]
},
"compileOnSave": true,
"exclude": [ "node_modules/*", "**/*-aot.ts" ]
}
现在当我尝试添加：
import * as _ from 'underscore';
在我的组件中，我找不到模块下划线错误消息。
我已经将所有在线示例都跟踪到T并仍然出现此错误。
任何人都能看到我错过的东西吗？
谢谢。
答案 0 :(得分：1)
您很可能已经安装了下划线，您的应用程序将在运行时工作，但您缺少类型声明，因此typescript编译器不知道该模块并抱怨它。
要解决此问题，您需要通过typings或您用于此目的的任何工具安装下划线类型定义。
答案 1 :(得分：1)
也安装打字。
npm install --save underscore
npm install --save @types/underscore