TypeScript compilation error caused by typing issues

My current setup includes typescript 1.7.5, typings 0.6.9, and angular 2.0.0-beta.0.

Is there a way to resolve the typescript compile error messages related to the Duplicate identifier issue caused by typings definition files?

The error message points out duplicate identifiers in the definition files of various directories:

node_modules/angular2/typings/es6-shim/es6-shim.d.ts
node_modules/angular2/typings/jasmine/jasmine.d.ts
node_modules/angular2/typings/zone/zone.d.ts
typings/browser/ambient/es6-promise/es6-promise.d.ts
typings/browser/ambient/es6-shim/es6-shim.d.ts
typings/browser/ambient/jasmine/jasmine.d.ts
typings/browser/ambient/karma/karma.d.ts
typings/browser/ambient/zone.js/zone.js.d.ts

I'm curious about why the compiler is looking into node_modules/angular2 directory when it's excluded in tsconfig.json.

I have raised this question on GitHub as well

Here is how my tsconfig.json looks like:

{
    "compilerOptions": {
        "target": "es5",
        "module": "system",
        "moduleResolution": "node",
        [...]
    },
    "exclude": [
        "node_modules",
        "typings/main",
        "typings/main.d.ts"
    ]
}

By changing the exclude part of tsconfig.json to remove specific exclusions, I managed to get rid of the errors:

"exclude": [
    "node_modules",
    "typings"
]

However, adding an additional reference path results in the reappearance of the same Duplicate identifier compile errors:

/// <reference path="../../typings/browser.d.ts" />

For further reference, here is how my typings.json file is structured:


{
  "name": "example-mean-app-client",
  "dependencies": {},
  "devDependencies": {},
  "ambientDependencies": {
    [...]
  }
}

Answer №1

In my experience, deciding between 'browser' or 'main' (based on the nature of your application: front end or back end) and omitting the other from tsconfig.json proved to be effective:

  "exclude": [
    "node_modules",
    "wwwroot",
    "typings/main",
    "typings/main.d.ts"
  ]

Answer №2

As mentioned by basarat, there are two ways to resolve this issue:

"moduleResolution": "node",

You can change the above code snippet to:

"moduleResolution": "classic",

Alternatively, you can remove any duplicate typings present in the typings folder. The problem arises when all typings files from the node_modules directory get automatically imported whenever an import statement is used in your code. This also includes importing typings of dependencies listed in the browser.d.ts file.

Answer №3

Why is the compiler still checking files in the node_modules/angular2 directory even though I specified exclusion in tsconfig.json?

The reason for this is because of the setting "moduleResolution": "node",, which prompts the compiler to only check imported files (if exclude was not set, it would check all files).

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