Discrepancies in output between grunt-ts and tsc

Currently, I have set up a tsconfig.json file in combination with grunt-ts for the following grunt task:

ts: {
    default: {
    tsconfig: true
  }

Here is the content of the tsconfig.json file:

{
  "compilerOptions": {
    "target": "es5",
    "module": "system",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false,
    "rootDir": "app",
    "outDir": "dist"
  },
  "exclude": [
    "node_modules",
    "bower_components",
    "typings/main",
    "typings/main.d.ts"
  ]
}

However, when attempting to execute this grunt task, an error TS2300 regarding duplicate identifiers occurs. Despite including exclude: "typings/main" to prevent this issue, it only works correctly when using tsc through the command line and not with the grunt-ts task. It seems to exclude node_modules during compilation but fails to do so with the typings file.

typescriptgruntjsnpmtscgrunt-ts

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