Angular2 Tutorial (Tour of Heroes): Cannot find module 'angular2-in-memory-web-api'

问题:

I have followed the Tutorial. After changing app/maint.ts in the Http chapter I get the error when starting the app via command line:

app/main.ts(5,51): error TS2307: Cannot find module 'angular2-in-memory-web-api'.

(Visual Studio Code gives me the same error within main.ts - red wavy underlining.)

Here is my systemjs.config.js:

/**  * System configuration for Angular 2 samples  * Adjust as necessary for your application needs.  */ (function(global) {   // map tells the System loader where to look for things   var map = {     'app':                        'app', // 'dist',     '@angular':                   'node_modules/@angular',     'angular2-in-memory-web-api': 'node_modules/angular2-in-memory-web-api',     'rxjs':                       'node_modules/rxjs'   };   // packages tells the System loader how to load when no filename and/or no extension   var packages = {     'app':                        { main: 'main.js',  defaultExtension: 'js' },     'rxjs':                       { defaultExtension: 'js' },     'angular2-in-memory-web-api': { defaultExtension: 'js' },   };   var ngPackageNames = [     'common',     'compiler',     'core',     'http',     'platform-browser',     'platform-browser-dynamic',     'router',     'router-deprecated',     'upgrade',   ];   // Add package entries for angular packages   ngPackageNames.forEach(function(pkgName) {     packages['@angular/'+pkgName] = { main: pkgName + '.umd.js', defaultExtension: 'js' };   });   var config = {     map: map,     packages: packages   }   System.config(config); })(this);

Here is my app/main.ts:

// Imports for loading & configuring the in-memory web api import { provide }    from '@angular/core'; import { XHRBackend } from '@angular/http';  import { InMemoryBackendService, SEED_DATA } from 'angular2-in-memory-web-api'; import { InMemoryDataService }               from './in-memory-data.service';  // The usual bootstrapping imports import { bootstrap }      from '@angular/platform-browser-dynamic'; import { HTTP_PROVIDERS } from '@angular/http';  import { AppComponent }   from './app.component';  bootstrap(AppComponent, [     HTTP_PROVIDERS,     provide(XHRBackend, { useClass: InMemoryBackendService }), // in-mem server     provide(SEED_DATA,  { useClass: InMemoryDataService })     // in-mem server data ]);

回答1:

For me the only solution was to upgrade angular2-in-memory-web-api to 0.0.10.

In package.json set

'angular2-in-memory-web-api': '0.0.10'

in the dependecies block, and in systemjs.config.js set

'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' }

in the packages object.

回答2:

As for projects created using current CLI Tools, it worked for me by installing

npm install angular-in-memory-web-api --save

and then performing import as

import { InMemoryWebApiModule } from 'angular-in-memory-web-api/in-memory-web-api.module';

My package.json

> "dependencies": { >     "@angular/common": "^2.4.0", >     "@angular/compiler": "^2.4.0", >     "@angular/core": "^2.4.0", >     "@angular/forms": "^2.4.0", >     "@angular/http": "^2.4.0", >     "@angular/platform-browser": "^2.4.0", >     "@angular/platform-browser-dynamic": "^2.4.0", >     "@angular/router": "^3.4.0", >     "angular-in-memory-web-api": "^0.3.1", >     "core-js": "^2.4.1", >     "rxjs": "^5.1.0", >     "zone.js": "^0.7.6"   },  >     "devDependencies": { >     "@angular/cli": "1.0.0-rc.4", >     "@angular/compiler-cli": "^2.4.0", >     "@types/jasmine": "2.5.38", >     "@types/node": "~6.0.60", >     "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-jasmine": "~1.1.0", >     "karma-jasmine-html-reporter": "^0.2.2", >     "karma-coverage-istanbul-reporter": "^0.2.0", >     "protractor": "~5.1.0", >     "ts-node": "~2.0.0", >     "tslint": "~4.5.0", >     "typescript": "~2.0.0"   }

回答3:

Here is what worked for me:

I noticed that the package.json had the following version:

"angular2-in-memory-web-api": "0.0.20"

Note the "2" in the name.

However when referencing InMemoryWebApiModule it was using 'angular-in-memory-web-api' without the 2 in the name. So I added it and it resolved the issue:

import { InMemoryWebApiModule } from 'angular2-in-memory-web-api';

Note: I found this in notice section of https://github.com/angular/in-memory-web-api

As of v.0.1.0, the npm package was renamed from angular2-in-memory-web-api to its current name, angular-in-memory-web-api. All versions after 0.0.21 are shipped under this name. Be sure to update your package.json and import statements.

回答4:

Angular 4 Changes

As of October 17, 2017, the tutorial fails to mention that angular-in-memory-web-api is not included in a standard CLI build, and must be installed separately. This can be easily done with npm:

$ npm install angular-in-memory-web-api --save

This automatically handles the necessary changes to package.json, so you don't need to make edits yourself.

Points of confusion

This thread is quite confusing as the Angular CLI has changed significantly since this thread was started; a problem with many rapidly-evolving APIs.

• angular-in-memory-web-api has been renamed; it drops the 2 from angular2 to simply angular
• The Angular CLI no longer uses SystemJS (replaced by Webpack), so systemjs.config.js no longer exists.
• npm's package.json should not be edited directly; use the CLI.

Solution

As of October 2017, the best fix is to simply install it yourself using npm, as I mentioned above:

$ npm install angular-in-memory-web-api --save

Good luck out there!

回答5:

I'm currently doing the tutorial and had a similar problem. What seems to have fixed it for me is defining a main file for 'angular2-in-memory-web-api' in the packages variable in systemjs.config.js:

'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' },

Before I added this, there was a 404 error logged for /node_modules/angular2-in-memory-web-api/ where it seemed to be trying to load a JavaScript file. Now it loads /node_modules/angular2-in-memory-web-api/index.js and the other files in this module.

回答6:

It works for me:

In package.json dependencies block set ( use "angular" instead of "angular2")

"angular-in-memory-web-api": "^0.3.2",

Then run

 npm install

OR

simply just run (my preferable)

npm install angular-in-memory-web-api --save

回答7:

This solved the 404 problem

From Angular in-memory-web-api Documentation

Always import the InMemoryWebApiModule after the HttpModule to ensure that the XHRBackend provider of the InMemoryWebApiModule supersedes all others.

Module imports should have InMemoryWebApiModule listed after HttpModule

@NgModule({ imports:      [ BrowserModule,               AppRoutingModule,               FormsModule,               HttpModule,               InMemoryWebApiModule.forRoot(InMemoryDataService),               ...

回答8:

From your root folder (the folder contain package.json), using:

回答9:

I am using angular 4 and below solved my problem.

npm install angular-in-memory-web-api --save

回答10:

This was a real stinker. Thanks to @traneHead, @toni and others, these steps worked for me.

1. Upgrade angular2-in-memory-web-api to 0.0.10
2. Edit the packages variable property in systemjs.config.js:

angular2-in-memory-web-api': { main: 'core.js', defaultExtension: 'js' }

回答11:

I create my project using angular-cli and i set in package.json "angular-in-memory-web-api": "^0.2.4" in dependences block and then i run npm install.

Work for me :D

回答12:

For users who generated an empty project with angular cli 1.4.9 (Actual on October 2017) and then started follow the instructions step-by-step, just run the following command:

npm i angular-in-memory-web-api

Just that command, without anything additional.

Hope that saves someone's time

回答13:

The simplest solution I could think of was to install the package with npm and restart the server:

npm install angular-in-memory-web-api --save

I almost installed the angular2-in-memory-web-api package, but the npm page says:

All versions after 0.0.21 are (or soon will be) shipped under angular-in-memory-web-api.

Note: This solution worked for a project that was created with the CLI tools, which does not list the package as a dependency, and might not solve the problem for projects that were created with the Quickstart seed, which does list the package as a dependency.

回答14:

If you are using angular cli, you would get this error.

Please add 'angular2-in-memory-web-api' in the const barrels in the system-config.ts file as below:

 const barrels: string[] = [   // Angular specific barrels.   '@angular/core',   '@angular/common',   '@angular/compiler',   '@angular/forms',   '@angular/http',   '@angular/router',   '@angular/platform-browser',   '@angular/platform-browser-dynamic',    // Thirdparty barrels.   'rxjs',   'angular2-in-memory-web-api',    // App specific barrels.   'app',   'app/shared',   /** @cli-barrel */ ];

And add 'angular2-in-memory-web-api': 'vendor/angular2-in-memory-web-api' as below.

System.config({   map: {     '@angular': 'vendor/@angular',     'rxjs': 'vendor/rxjs',     'main': 'main.js',     'angular2-in-memory-web-api': 'vendor/angular2-in-memory-web-api'   },   packages: cliSystemConfigPackages,  });

Rebuild using npm start. This resolved the issue for me.

回答15:

Try adding the typescript definitions:

sudo typings install --save file:./node_modules/angular2-in-memory-web-api/in-memory-backend.service.d.ts

... specifying the dependency name:

angular2-in-memory-web-api

Then add the entry point for "angular2-in-memory-web-api" in /systemjs.config.js

var packages = {   ...   'angular2-in-memory-web-api': { main: 'core.js', defaultExtension: 'js' } };

回答16:

I had the same problem, I changed in systemjs.config :

'angular2-in-memory-web-api': { defaultExtension: 'js' },

By this line :

'angular2-in-memory-web-api': { main: 'core.js', defaultExtension: 'js' },

回答17:

Changing this line, as suggested above, worked for me in the Angular 2 Heroes Tutorial:

'angular2-in-memory-web-api': { main: 'core.js', defaultExtension: 'js' },

回答18:

I solved it copying index.js and index.d.ts to core.js and core.d.ts, that is, inside node_modules/angular2-in-memory-web-api folder. Go figure out.

回答19:

The main answer helped me: change

'angular2-in-memory-web-api': { defaultExtension: 'js' },

to

'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' }

回答20:

in app\main.ts simply modify:

import { InMemoryBackendService, SEED_DATA } from 'angular2-in-memory-web-api';

to:

import { InMemoryBackendService, SEED_DATA } from '../node_modules/angular2-in-memory-web-api';

then add the index.js parameter in

var packages = {     'app': { main: 'main.js', defaultExtension: 'js' },     'rxjs': { defaultExtension: 'js' },     'angular2-in-memory-web-api': { main:'index.js', defaultExtension: 'js' } };

in systemjs.config.js

it's work for me.

回答21:

Latest fix as of this date, is to

1. replace all instances of "angular2-in-memory-web-api" with "angular-in-memory-web-api".
2. Change package.json dependency version from "angular-in-memory-web-api": "0.0.20" to "angular-in-memory-web-api": "0.1.0" and "zone.js": "^0.6.23" to "zone.js": "^0.6.25"
3. In systemjs.config.js, change the path for index.js. It should look like:
   'angular-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' }

回答22:

As of latest (currently 0.1.14), this is what's stated in the CHANGELOG

In systemjs.config.js you should change the mapping to:

'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js'

then delete from packages:

'angular-in-memory-web-api': {            main: './index.js',         defaultExtension: 'js'       }

回答23:

I got this error because I was importing InMemoryWebApiModule from angular2-in-memory-web-api I removed the 2. Actually I had two entries in my package.json file; one was angular2-in-memory-web-api and the second wasangular-in-memory-web-api. Using angular-in-memory-web-api solved the problem for me. So your import should be like this:

import { InMemoryWebApiModule } from 'angular-in-memory-web-api'; ... @NgModule({  imports: [ InMemoryWebApiModule.forRoot(InMemoryDataService) ] })

Using cli-angular you need not to change anything regarding system.config.js.

回答24:

For me just doing an install from angular-tour-of-heroes directory works for me

C:\nodejs\angular-tour-of-heroes>npm install angular-in-memory-web-api --save

回答25:

The Best way is to install it using NPM e.g

npm install git+https://github.com/itryan/in-memory-web-api/ --save

it will add required reference

回答26:

I encountered a similar problem. I just downloaded the entire example near the end of part 7 (last part) of the tutorial and ran it. It worked.

Of course, you need to install and compile everything first.

> npm install > npm start

I also changed 'app-root' to 'my-app' in app.component.ts.

回答27:

If using angular cli to build your angular2 app, including the angular2-in-memory-web-api involves three steps:

1. add the api to the system-config.ts file (inside the src subdirectory) like below:

   /** Map relative paths to URLs. */ const map: any = {   'angular2-in-memory-web-api': 'vendor/angular2-in-memory-web-api' }; /** User packages configuration. */ const packages: any = {   'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' } };

2. Add

   angular2-in-memory-web-api/**/*.+(js|js.map)' 

to the vendorNpmFiles array in the angular-cli-build.js file like ofShard mentioned;

3. Of course, add to the package.json as described by traneHead; for 2.0.0-rc.3 I use the version below:

   "angular2-in-memory-web-api": "0.0.13"

I find this link "Adding material2 to your project" explains the process of adding third-party libraries quite clearly.

回答28:

Toni, You need to add the typings for Angular2-in-memory-web-api.

Add them in your TS file.

/// reference path=”./../node_modules/angular2-in-memory-web-api/typings/browser.d.ts”

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