Webstorm, TypeScript, Angular2, Transpiler, Duplicate Identifier error messages

Question

OS: Windows Pro 10
Webstorm: ver 11.0.1
AngularJS: ver 2.0.0-alpha.46

WebStorm Settings

Tools – File Watcher: Babal
Language & Frameworks – JavaScript:
JavaScript language version: ECMAScript 6
Language & Frameworks – TypeScript:
Enable TypeScript Compiler (checked):
Use tsconfig.json (checked)

Project structure:

- bin
- node_modules/angular2
- src/tsconfig.json
- package.json

Package.json

{
  "name": "TypeScriptHTMLApp2",
  "version": "1.0.0",
  "dependencies": {
    "angular2": "2.0.0-alpha.46",
    "es6-shim": "^0.33.13",
    "systemjs": "0.19.6"
  },
  "devDependencies": {
    "babel-preset-es2015": "^6.3.13"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false
  },
  "exclude": [
    "node_modules"
  ]
}

Note: node_modules folder in the webstorm project window, has also been set to 'exclude'.

So webstorm is throwing the following duplicate identifier error messages:

C:\Program Files (x86)\JetBrains\WebStorm 11.0.1\plugins\JavaScriptLanguage\typescriptCompiler\external\lib.es6.d.ts
Error:(3841, 14) TS2300: Duplicate identifier 'PropertyKey'.
Error:(4034, 5) TS2300: Duplicate identifier 'EPSILON'.
Error:(4069, 5) TS2300: Duplicate identifier 'MAX_SAFE_INTEGER'.
Error:(4076, 5) TS2300: Duplicate identifier 'MIN_SAFE_INTEGER'.
Error:(4362, 5) TS2300: Duplicate identifier 'done'.
Error:(4363, 5) TS2300: Duplicate identifier 'value'.
Error:(4592, 5) TS2300: Duplicate identifier 'flags'.
Error:(4620, 5) TS2300: Duplicate identifier 'size'.
Error:(4630, 5) TS2300: Duplicate identifier 'prototype'.
Error:(4647, 5) TS2300: Duplicate identifier 'prototype'.
Error:(4659, 5) TS2300: Duplicate identifier 'size'.
Error:(4669, 5) TS2300: Duplicate identifier 'prototype'.
Error:(4685, 5) TS2300: Duplicate identifier 'prototype'.
Error:(5072, 5) TS2300: Duplicate identifier 'prototype'.
C:\Users\Theo\Documents\WebStorm\Projects\TypeScriptHTMLApp2\TypeScriptHTMLApp2\node_modules\angular2\typings\es6-shim\es6-shim.d.ts
Error:(6, 14) TS2300: Duplicate identifier 'PropertyKey'.
Error:(9, 5) TS2300: Duplicate identifier 'done'.
Error:(10, 5) TS2300: Duplicate identifier 'value'.
Error:(248, 5) TS2300: Duplicate identifier 'EPSILON'.
Error:(283, 5) TS2300: Duplicate identifier 'MAX_SAFE_INTEGER'.
Error:(290, 5) TS2300: Duplicate identifier 'MIN_SAFE_INTEGER'.
Error:(346, 5) TS2300: Duplicate identifier 'flags'.
Error:(498, 5) TS2300: Duplicate identifier 'prototype'.
Error:(561, 5) TS2300: Duplicate identifier 'size'.
Error:(570, 5) TS2300: Duplicate identifier 'prototype'.
Error:(581, 5) TS2300: Duplicate identifier 'size'.
Error:(590, 5) TS2300: Duplicate identifier 'prototype'.
Error:(605, 5) TS2300: Duplicate identifier 'prototype'.
Error:(619, 5) TS2300: Duplicate identifier 'prototype'.

How do I resolve this issue?

Many thanks in advance

stackoverflow.com/questions/31322525/… ... it's just a guess what the issue may be. — MartyIX
– MartyIX, Commented Dec 10, 2015 at 10:57
Are you using both Babel and Typescript? Probably that's the mistake! You not need Babel, just set "ES5" as target in your tsconfig — Hitmands
– Hitmands, Commented Dec 10, 2015 at 14:33
@Hitmands The issue has been resolved since I upgraded to webstorm 11.0.2 Initially I thought the same thing, but it's a legitimate practice. Doing so my project generates, from the initial .ts files, .js, .js.map, compiled.js, and compiled.js.map files. See the following article for using both typescript and babel compilers: [link]dev.ivogabe.com/combine-typescript-with-babel And here's the initial document I used to setup webstorm with babel: [link] blog.jetbrains.com/webstorm/2015/05/… — TheoG
– TheoG, Commented Dec 10, 2015 at 18:03
Hey @TheoG, sincerely i prefer using IDE just as a platform for manage projects (coding, ecc...), but, for building process I use webpack, gulp and tools like these because I need to perform building even in deployment phases :) — Hitmands
– Hitmands, Commented Dec 10, 2015 at 18:14

Kamran Kazımi · Accepted Answer · 2019-08-19 07:59:55Z

-2

This happens when BOTH files are open in the editor. If you close one of the files, the error goes away...

Look at here: Webstorm marks duplicate identifier error for variables from separate files

answered Aug 19, 2019 at 7:59

Kamran Kazımi

1

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1 Comment

Erdal G. Over a year ago

Unfortunately, it can also happen outside of that scope. One same symptom does not mean the issue is the same

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