title: Cannot find type definition file for 'source-map'
body: <p>I am trying to run an angular 5 app which I upgraded from angular 4 but am encountering this error when I run <code>npm run server:dev</code>:</p>
  
  <pre><code>[at-loader] Checking finished with 1 errors
  [at-loader] TS2688: Cannot find type definition file for 'source-map'.
  </code></pre>
  
  <p>Here is my <strong>package.json</strong></p>
  
  <pre><code>    {
    "name": "Hidden",
    "version": "v1.0.0",
    "description": "",
    "keywords": [
      "Hidden"
    ],
    "author": "Hidden",
    "license": "MIT",
    "scripts": {
      "build:dev": "webpack --config config/webpack.dev.js --progress --profile",
      "build:docker": "npm run build:prod &amp;&amp; docker build -t angular2-webpack-start:latest .",
      "build:prod": "webpack --config config/webpack.prod.js  --progress --profile --bail",
      "build": "npm run build:dev",
      "ci": "npm run lint &amp;&amp; npm test &amp;&amp; npm run e2e",
      "clean:dist": "npm run rimraf -- dist",
      "clean:install": "npm set progress=false &amp;&amp; npm install",
      "clean:start": "npm start",
      "clean": "npm cache clean &amp;&amp; npm run rimraf -- node_modules doc coverage dist",
      "docker": "docker",
      "docs": "npm run typedoc -- --options typedoc.json --exclude '**/*.spec.ts' ./src/",
      "e2e:live": "npm run e2e -- --elementExplorer",
      "e2e": "npm run protractor",
      "github-deploy:dev": "webpack --config config/webpack.github-deploy.js --progress --profile --github-dev",
      "github-deploy:prod": "webpack --config config/webpack.github-deploy.js --progress --profile --github-prod",
      "github-deploy": "npm run github-deploy:dev",
      "lint": "npm run tslint \"src/**/*.ts\"",
      "lite": "lite-server",
      "postversion": "git push &amp;&amp; git push --tags",
      "prebuild:dev": "npm run clean:dist",
      "prebuild:prod": "npm run clean:dist",
      "preclean:install": "npm run clean",
      "preclean:start": "npm run clean",
      "pree2e": "npm run webdriver:update -- --standalone",
      "preversion": "npm test",
      "protractor": "protractor",
      "rimraf": "rimraf",
      "server:dev:hmr": "npm run server:dev -- --inline --hot",
      "server:dev": "webpack-dev-server --config config/webpack.dev.js --progress --profile --watch --content-base src/",
      "server:prod": "http-server dist --cors",
      "server": "npm run server:dev",
      "start:hmr": "npm run server:dev:hmr",
      "start": "npm run server:dev",
      "test": "karma start",
      "tslint": "tslint",
      "typedoc": "typedoc",
      "version": "npm run build",
      "watch:dev:hmr": "npm run watch:dev -- --hot",
      "watch:dev": "npm run build:dev -- --watch",
      "watch:prod": "npm run build:prod -- --watch",
      "watch:test": "npm run test -- --auto-watch --no-single-run",
      "watch": "npm run watch:dev",
      "webdriver-manager": "webdriver-manager",
      "webdriver:start": "npm run webdriver-manager start",
      "webdriver:update": "npm run webdriver-manager update",
      "webpack-dev-server": "webpack-dev-server",
      "webpack": "webpack"
    },
    "dependencies": {
      "@angular/animations": "^5.2.3",
      "@angular/common": "^5.2.3",
      "@angular/compiler": "^5.2.3",
      "@angular/core": "^5.2.3",
      "@angular/forms": "^5.2.3",
      "@angular/http": "^5.2.3",
      "@angular/material": "^2.0.0-beta.12",
      "@angular/platform-browser": "^5.2.3",
      "@angular/platform-browser-dynamic": "^5.2.3",
      "@angular/platform-server": "^5.2.3",
      "@angular/router": "^5.2.3",
      "@angularclass/conventions-loader": "^1.0.2",
      "@angularclass/hmr": "~2.1.3",
      "@angularclass/hmr-loader": "~3.0.4",
      "@ngtools/webpack": "^1.9.7",
      "@types/jquery": "^3.2.18",
      "angular-tag-cloud-module": "^2.4.0",
      "assets-webpack-plugin": "^3.4.0",
      "b64-to-blob": "^1.2.19",
      "core-js": "^2.4.1",
      "http-server": "^0.9.0",
      "ie-shim": "^0.1.0",
      "jquery": "^3.2.1",
      "ng2-bs3-modal": "^0.13.0",
      "ng2-img-cropper": "^0.9.0",
      "ngc-webpack": "^4.1.2",
      "occurences": "^2.2.2",
      "reflect-metadata": "^0.1.10",
      "rxjs": "^5.5.6",
      "zone.js": "~0.8.14"
    },
    "devDependencies": {
      "@angular/compiler-cli": "^5.2.3",
      "@types/hammerjs": "^2.0.34",
      "@types/jasmine": "2.5.45",
      "@types/node": "^7.0.39",
      "@types/selenium-webdriver": "2.53.38",
      "@types/source-map": "^0.5.0",
      "@types/uglify-js": "^2.6.28",
      "@types/webpack": "^2.2.16",
      "angular2-template-loader": "^0.6.2",
      "assets-webpack-plugin": "^3.5.1",
      "awesome-typescript-loader": "~3.1.2",
      "codelyzer": "~2.1.1",
      "copy-webpack-plugin": "^4.0.1",
      "css-loader": "^0.28.0",
      "exports-loader": "^0.6.4",
      "expose-loader": "^0.7.3",
      "extract-text-webpack-plugin": "~3.0.0",
      "file-loader": "^0.11.1",
      "gh-pages": "^1.0.0",
      "html-webpack-plugin": "^2.28.0",
      "imports-loader": "^0.7.1",
      "istanbul-instrumenter-loader": "2.0.0",
      "jasmine-core": "^2.5.2",
      "json-loader": "^0.5.4",
      "karma": "^1.2.0",
      "karma-chrome-launcher": "^2.0.0",
      "karma-coverage": "^1.1.1",
      "karma-jasmine": "^1.0.2",
      "karma-mocha-reporter": "^2.0.0",
      "karma-remap-coverage": "^0.1.4",
      "karma-sourcemap-loader": "^0.3.7",
      "karma-webpack": "1.8.1",
      "ng-router-loader": "^2.1.0",
      "node-sass": "^4.5.2",
      "npm-run-all": "^4.0.2",
      "parse5": "^3.0.2",
      "protractor": "^4.0.10",
      "raw-loader": "0.5.1",
      "rimraf": "~2.6.1",
      "sass-loader": "^6.0.3",
      "script-ext-html-webpack-plugin": "^1.8.5",
      "source-map-loader": "^0.2.1",
      "string-replace-loader": "~1.3.0",
      "strip-loader": "^0.1.2",
      "style-loader": "^0.18.1",
      "to-string-loader": "^1.1.5",
      "ts-helpers": "1.1.2",
      "ts-node": "^3.3.0",
      "tslint": "~4.5.1",
      "typedoc": "^0.7.1",
      "typescript": "2.4.2",
      "url-loader": "^0.5.8",
      "v8-lazy-parse-webpack-plugin": "^0.3.0",
      "webpack": "3.5.5",
      "webpack-dev-middleware": "^1.10.1",
      "webpack-dev-server": "~2.7.1",
      "webpack-md5-hash": "^0.0.5",
      "webpack-merge": "~4.1.0"
    },
    "engines": {
      "node": "&gt;= 4.2.1",
      "npm": "&gt;= 3"
    }
  }
  </code></pre>