node_modules/rxjs/tsconfig.json

{
  "compilerOptions": {
    "incremental": true,
    "removeComments": true,
    "preserveConstEnums": true,
    "sourceMap": true,
    "strict": true,
    "noImplicitReturns": true,
    "moduleResolution": "node",
    "stripInternal": true,
    "noEmit": true,
    "lib": [
      "esnext",
      "dom"
    ],
    "target": "esnext",
    "baseUrl": ".",
    "paths": {
      "rxjs": ["./src/index"],
      "rxjs/operators": ["./src/operators/index"],
      "rxjs/testing": ["./src/testing/index"],
      "rxjs/ajax": ["./src/ajax/index"],
      "rxjs/webSocket": ["./src/webSocket/index"],
      "rxjs/fetch": ["./src/fetch/index"],
      "rxjs/internal/*": ["./src/internal/*"]
    }
  }
}