I have been unable to fix this error or determine the cause. No code has changed, so I assume it is a result of an NPM package being updated. Here is the error log to the console. This is for an Angular2 application.
ERROR in [at-loader] ./node_modules/@types/popper.js/index.d.ts:6:19
TS2300: Duplicate identifier 'Popper'.
ERROR in [at-loader] ./node_modules/@types/popper.js/index.d.ts:89:15
TS2300: Duplicate identifier 'Popper'.
ERROR in [at-loader] ./node_modules/@types/popper.js/index.d.ts:104:3
TS2300: Duplicate identifier 'default'.
ERROR in [at-loader] ./node_modules/popper.js/index.d.ts:8:19
TS2300: Duplicate identifier 'Popper'.
ERROR in [at-loader] ./node_modules/popper.js/index.d.ts:113:15
TS2300: Duplicate identifier 'Popper'.
ERROR in [at-loader] ./node_modules/popper.js/index.d.ts:120:43
TS2694: Namespace 'Popper' has no exported member 'ReferenceObject'.
ERROR in [at-loader] ./node_modules/popper.js/index.d.ts:130:3
TS2300: Duplicate identifier 'default'.
Here is my tsconfig.json file:
{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"lib": [ "es2015", "dom" ],
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true,
"typeRoots": [
"../node_modules/@types/"
]
},
"compileOnSave": true,
"exclude": [
"node_modules/*",
"**/*-aot.ts"
]
}
Here is my package.json file as you requested. I think the problem is that one of these package is upgrading to an unstable version, because I had not been receiving this error in the past:
{
"name": "truerec-verifier-landing-page",
"version": "1.0.0",
"description": "TrueRec verifier web.",
"scripts": {
"start": "webpack-dev-server --inline --progress --port 8080",
"test": "karma start karma.webpack.conf.js",
"build": "rm -rf dist/* && webpack --config config/webpack.prod.js --bail",
"dev": "rm -rf dist/* && webpack --config config/webpack.dev.js --bail"
},
"keywords": [],
"author": "",
"license": "MIT",
"dependencies": {
"@angular/animations": "~4.1.1",
"@angular/common": "~4.1.1",
"@angular/compiler": "~4.1.1",
"@angular/compiler-cli": "~4.1.1",
"@angular/core": "~4.1.1",
"@angular/forms": "~4.1.1",
"@angular/http": "~4.1.1",
"@angular/platform-browser": "~4.1.1",
"@angular/platform-browser-dynamic": "~4.1.1",
"@angular/platform-server": "~4.1.1",
"@angular/router": "~4.1.1",
"@angular/tsc-wrapped": "~4.1.1",
"@angular/upgrade": "~4.1.1",
"angular-in-memory-web-api": "~0.3.1",
"angular2-recaptcha": "^0.4.1",
"core-js": "^2.4.1",
"jquery": "^3.2.1",
"js-sha3": "^0.5.7",
"ng2-pdf-viewer": "^1.1.0",
"ng2-semantic-ui": "^0.8.4",
"ng2-toastr": "^4.1.2",
"ngx-cookie": "^1.0.0",
"pdfjs-dist": "^1.8.430",
"rxjs": "5.0.1",
"zone.js": "0.8.12"
},
"devDependencies": {
"@types/google.analytics": "0.0.33",
"@types/jasmine": "2.5.36",
"@types/node": "^6.0.45",
"angular2-template-loader": "^0.6.0",
"awesome-typescript-loader": "^3.0.4",
"css-loader": "^0.26.1",
"extract-text-webpack-plugin": "2.0.0-beta.5",
"file-loader": "^0.9.0",
"html-loader": "^0.4.3",
"html-webpack-plugin": "^2.16.1",
"jasmine": "~2.4.1",
"jasmine-core": "~2.4.1",
"karma": "^1.3.0",
"karma-chrome-launcher": "^2.0.0",
"karma-cli": "^1.0.1",
"karma-jasmine": "^1.0.2",
"karma-jasmine-html-reporter": "^0.2.2",
"karma-phantomjs-launcher": "^1.0.2",
"karma-sourcemap-loader": "^0.3.7",
"karma-webpack": "^2.0.1",
"less": "^2.7.2",
"less-loader": "^4.0.4",
"lodash": "^4.16.2",
"null-loader": "^0.1.1",
"phantomjs-prebuilt": "2.1.13",
"protractor": "~4.0.14",
"raw-loader": "^0.5.1",
"request": "^2.81.0",
"resolve-url-loader": "^2.0.2",
"rimraf": "^2.5.4",
"style-loader": "^0.13.1",
"to-string-loader": "^1.1.5",
"tslint": "^3.15.1",
"typescript": "~2.3.0",
"webpack": "2.2.1",
"webpack-dev-server": "2.4.1",
"webpack-merge": "^3.0.0"
},
"repository": {}
}