chromium/ash/webui/diagnostics_ui/resources/tsconfig_base.json

{
    "extends": "../../../../tools/typescript/tsconfig_base_polymer.json",
    "compilerOptions": {
      "allowUmdGlobalAccess": true,
      "typeRoots": [ "../../../../third_party/node/node_modules/@types" ],
      "types": [ "d3" ]
    }
  }