Changing baseUrl causes compiler not to look at @types subdirectory

When `baseUrl` is set in tsconfig.json, the compiler will not look into `baseUrl/@types` to try and find type definitions **TypeScript Version:** 2.2.1 **Code** Example is available at: https://github.com/spion/ts-base-url-issue If the "paths" entry is removed from tsconfig.json, the compiler is unable to find `react-dom` **Expected behavior:** Compiles fine even without a "paths" entry. **Actual behavior:** Compiler doesn't find the definition file if the paths config option is removed. `--trace-resolution` shows that it never tries baseUrl/@types/react-dom ``` ======== Resolving module 'react-dom' from '/Users/spion/Documents/tests/ts-modules-broken/app/index.ts'. ======== Explicitly specified module resolution kind: 'NodeJs'. 'baseUrl' option is set to '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules', using this value to resolve non-relative module name 'react-dom' Resolving module name 'react-dom' relative to base url '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules' - '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom'. Loading module as file / folder, candidate module location '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom', target file type 'TypeScript'. File '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom.ts' does not exist. File '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom.tsx' does not exist. File '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom.d.ts' does not exist. Found 'package.json' at '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom/package.json'. 'package.json' does not have a 'typings' field. 'package.json' does not have a 'types' field. File '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom/index.ts' does not exist. File '/Users/spion/Documents/tests/ts-modules-broken/vendor/node_modules/react-dom/index.…