Cannot find type definition file for 'core-js'

I am creating an angular2 application with angular-cli . angular-in-memory-web-api is not installed by default.

So, I searched for it and added this line "angular-in-memory-web-api": "~0.1.5" to my package.json file. And did npm install .

Now I have such a problem.

 ERROR in [default] /home/adil/Code/AngularJS.2/cli-based/mz-doc-app/node_modules/angular-in-memory-web-api/in-memory-backend.service.d.ts:1:0 Cannot find type definition file for 'core-js'. 

Please suggest some solution?

package.json

 { "name": "mz-doc-app", "version": "0.0.0", "license": "MIT", "angular-cli": {}, "scripts": { "start": "ng serve", "lint": "tslint \"src/**/*.ts\"", "test": "ng test", "pree2e": "webdriver-manager update", "e2e": "protractor" }, "private": true, "dependencies": { "@angular/common": "~2.1.0", "@angular/compiler": "~2.1.0", "@angular/core": "~2.1.0", "@angular/forms": "~2.1.0", "@angular/http": "~2.1.0", "@angular/material": "^2.0.0-alpha.9-3", "@angular/platform-browser": "~2.1.0", "@angular/platform-browser-dynamic": "~2.1.0", "@angular/router": "~3.1.0", "@types/core-js": "^0.9.34", "angular-in-memory-web-api": "~0.1.5", "core-js": "^2.4.1", "rxjs": "5.0.0-beta.12", "ts-helpers": "^1.1.1", "zone.js": "^0.6.23" }, "devDependencies": { "@types/jasmine": "^2.2.30", "@types/node": "^6.0.42", "angular-cli": "1.0.0-beta.18", "codelyzer": "1.0.0-beta.1", "jasmine-core": "2.4.1", "jasmine-spec-reporter": "2.5.0", "karma": "1.2.0", "karma-chrome-launcher": "^2.0.0", "karma-cli": "^1.0.1", "karma-jasmine": "^1.0.2", "karma-remap-istanbul": "^0.2.1", "protractor": "4.0.9", "ts-node": "1.2.1", "tslint": "3.13.0", "typescript": "~2.0.3" } } 
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2 answers

I solved the problem by deleting the first line /// <reference types="core-js" /> node_modules/angular-in-memory-web-api/in-memory-backend.service.d.ts

This is not a permanent solution, but wait for a fix ( https://github.com/angular/in-memory-web-api/issues/62 )

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I had a similar problem using webpack. There are some breaking changes to in-mem-web-api since version 0.1.10.

https://github.com/angular/in-memory-web-api/blob/master/CHANGELOG.md#0113-2016-10-20

Changing the web api to version 0.1.9 fixes the symptom for me. (I am angular noob, so unfortunately I don't know a permanent solution).

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Source: https://habr.com/ru/post/1011881/


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