chromium/chrome/browser/resources/discards/tsconfig_base.json

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