Error TS2309: TypeScript encountered an error in Types/node/index.d.ts

I recently upgraded my .Net Core Angular 2 project using SystemJs from Typings to @Types.

The entire project has been rebuilt with the latest VS tooling for .Net Core 1.0.1, TypeScript 2.0.10, and Node.js 7.0.0 as of 12/21/2016.

Everything was working fine until I updated to @Types.

Now, I'm encountering the following Error from @Types/node/index.d.ts:

TS2309 "Build:An export assignment cannot be used in a module with other exported elements." Line 3626

Line 3626 of @Types/node/index.d.ts pertains to the Export for the "assert" module declaration.

Below are my configuration files:

tsconfig.json

"compilerOptions": {
  "target": "es5",
  "module": "commonjs",
  "moduleResolution": "node",
  "sourceMap": true,
  "emitDecoratorMetadata": true,
  "experimentalDecorators": true,
  "removeComments": false,
  "noImplicitAny": false,
  "skipLibCheck": true
},
"compileOnSave": true,
"exclude": [
  "node_modules",
  "wwwroot/shared/lib"
]

Package.json

"name": "angular-quickstart",
"version": "1.0.0",
"description": "QuickStart package.json from the documentation, supplemented with testing support",
"scripts": {
  "start": "tsc && concurrently \"tsc -w\" \"lite-server\" ",
  "lite": "lite-server",
  "tsc": "tsc",
  "tsc:w": "tsc -w"
},
... (remaining content of original text) ...

Answer №1

We received a helpful suggestion from the TypeScript team on GitHub that solved our issue.

Make sure to search for the following code snippet -

declare module "assert" {

This should only be present once in your project. In our case, we found it in two files - the TypeScript definition file in the @types/node package and a second one in our wwwroot folder. The duplicate file in the wwwroot folder was accidentally copied over by a Gulp task and caused conflicts with the compiler. Make sure to check for any duplicates like this to avoid similar issues!

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