I have created an app with angular 8 and cli with "ng new repro-app2" . The problem raise when , after including moment.js module or popper.js module, I run "ng serve" from my pc to serve application locally (http://localhost:4200/). The console of the browser (firefox and chrome) throw this error:
moment.min.js:1 Uncaught TypeError: Cannot set property 'moment' of undefined
at moment.min.js:1
at moment.min.js:1
The error disapear when I build the same application running "ng build --output-hashing=all" and I deploy the result on my webserver.
My angular.json file :
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects": {
"repro-app": {
"root": "",
"sourceRoot": "src",
"projectType": "application",
"prefix": "app",
"schematics": {},
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/repro-app",
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.app.json",
"assets": [
"src/favicon.ico",
"src/assets"
],
"styles": [
"src/styles.css"
],
"scripts": [
"node_modules/moment/min/moment.min.js"
],
"es5BrowserSupport": true
},
"configurations": {
"production": {
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
}
],
"optimization": true,
"outputHashing": "all",
"sourceMap": false,
"extractCss": true,
"namedChunks": false,
"aot": true,
"extractLicenses": true,
"vendorChunk": false,
"buildOptimizer": true,
"budgets": [
{
"type": "initial",
"maximumWarning": "2mb",
"maximumError": "5mb"
}
]
}
}
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"options": {
"browserTarget": "repro-app:build"
},
"configurations": {
"production": {
"browserTarget": "repro-app:build:production"
}
}
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n",
"options": {
"browserTarget": "repro-app:build"
}
},
"test": {
"builder": "@angular-devkit/build-angular:karma",
"options": {
"main": "src/test.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.spec.json",
"karmaConfig": "src/karma.conf.js",
"styles": [
"src/styles.css"
],
"scripts": [],
"assets": [
"src/favicon.ico",
"src/assets"
]
}
},
"lint": {
"builder": "@angular-devkit/build-angular:tslint",
"options": {
"tsConfig": [
"src/tsconfig.app.json",
"src/tsconfig.spec.json"
],
"exclude": [
"**/node_modules/**"
]
}
}
}
},
"repro-app-e2e": {
"root": "e2e/",
"projectType": "application",
"prefix": "",
"architect": {
"e2e": {
"builder": "@angular-devkit/build-angular:protractor",
"options": {
"protractorConfig": "e2e/protractor.conf.js",
"devServerTarget": "repro-app:serve"
},
"configurations": {
"production": {
"devServerTarget": "repro-app:serve:production"
}
}
},
"lint": {
"builder": "@angular-devkit/build-angular:tslint",
"options": {
"tsConfig": "e2e/tsconfig.e2e.json",
"exclude": [
"**/node_modules/**"
]
}
}
}
}
},
"defaultProject": "repro-app"
}
My package.json file:
{
"name": "repro-app",
"version": "0.0.0",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "~8.1.0",
"@angular/common": "~8.1.0",
"@angular/compiler": "~8.1.0",
"@angular/core": "~8.1.0",
"@angular/forms": "~8.1.0",
"@angular/platform-browser": "~8.1.0",
"@angular/platform-browser-dynamic": "~8.1.0",
"@angular/router": "~8.1.0",
"core-js": "^2.5.4",
"moment": "^2.24.0",
"rxjs": "~6.5.2",
"tslib": "^1.9.0",
"zone.js": "~0.9.1"
},
"devDependencies": {
"@angular-devkit/build-angular": "~0.801.0",
"@angular/cli": "~8.1.0",
"@angular/compiler-cli": "~8.2.0-next.0",
"@angular/language-service": "~8.1.0",
"@types/node": "~8.9.4",
"@types/jasmine": "~2.8.8",
"@types/jasminewd2": "~2.0.3",
"codelyzer": "^5.0.1",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~4.0.0",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.1",
"karma-jasmine": "~1.1.2",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.4.0",
"ts-node": "~7.0.0",
"tslint": "~5.11.0",
"typescript": "~3.4.5"
}
}
Is possible to download the app from here:
Remove "node_modules/moment/min/moment.min.js"
from you scripts
array in angular.json
file.
The error will be vanished.
As you have installed moment.js using npm, wherever you want to use it, just import it as following in your component:
// app.component.ts
import { Component } from '@angular/core';
import * as moment from 'moment';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
title = 'repro-app';
currentDate = moment(new Date()).format('MM/DD/YYYY')
constructor() {
console.log(this.currentDate);
}
}
thanks, this solved the issue. But any clue on why is this happening?