Styjun

I have an angular 4 project with this file

class DemoClass 
 description!: string;

If I build it with

ng build

from the project root I get

ERROR in src/app/client/medisoft-client.ts(3,16): error TS1005: '='
expected. src/app/client/medisoft-client.ts(3,17): error TS1109:
Expression expected.

removing the bang operator resolves this so it's definitely that which is the problem. The error seems like the version of type script isn't high enough but if I run

tsc --version

I get

Version 3.3.4000

which is high enough to support the bang operator. Moverover if I go to the directory with the file in and just transpile that one file i.e.

tsc --out test.js test.ts

then it build fine and I get the js output

So it looks like angular is using an older version of typescript but I'm stumped about where to look now to resolve this

Package.json file is

 "name": "project-name", "version": "0.0.0", "license": "MIT", "scripts": 
 "ng": "ng",
 "start": "ng build --base-href /Angular --deploy-url /Angular/",
 "build": "ng build",
 "test": "ng test",
 "lint": "ng lint",
 "e2e": "ng e2e" , "private": true, "dependencies": 
 "@angular/animations": "^5.2.0",
 "@angular/common": "^5.2.0",
 "@angular/compiler": "^5.2.0",
 "@angular/core": "^5.2.0",
 "@angular/forms": "^5.2.0",
 "@angular/http": "^5.2.0",
 "@angular/platform-browser": "^5.2.0",
 "@angular/platform-browser-dynamic": "^5.2.0",
 "@angular/router": "^5.2.0",
 "core-js": "^2.4.1",
 "rxjs": "^5.5.6",
 "zone.js": "^0.8.19" , "devDependencies": 
 "@angular/cli": "1.6.5",
 "@angular/compiler-cli": "^5.2.0",
 "@angular/language-service": "^5.2.0",
 "@types/jasmine": "~2.8.3",
 "@types/jasminewd2": "~2.0.2",
 "@types/node": "~6.0.60",
 "codelyzer": "^4.0.1",
 "jasmine-core": "~2.8.0",
 "jasmine-spec-reporter": "~4.2.1",
 "karma": "~2.0.0",
 "karma-chrome-launcher": "~2.2.0",
 "karma-cli": "~1.0.1",
 "karma-coverage-istanbul-reporter": "^1.2.1",
 "karma-jasmine": "~1.1.0",
 "karma-jasmine-html-reporter": "^0.2.2",
 "protractor": "~5.1.2",
 "ts-node": "~4.1.0",
 "tslint": "~5.9.1",
 "typescript": "^2.9.2" 

Your Angular project typescript version is lower than your global version. so you need to install the updated version in your angular project like below

npm install typescript@3.3.4000 --save-dev

Hope this will help!