Attempt to build library - cannot find tsconfig.json

[steve-taylor]

I created a new workspace and a couple of libraries. Whenever I attempt to build one of the libraries (e.g. nx build my-lib), I immediately get the following error:

(node:10956) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open '/path/to/my/repo/tsconfig.json'
    at Object.openSync (fs.js:476:3)
    at Object.readFileSync (fs.js:377:35)
    at Object.readJsonFile (/path/to/my/repo/node_modules/@nrwl/tao/src/utils/fileutils.js:16:26)
    at readRootTsConfig (/path/to/my/repo/node_modules/@nrwl/workspace/src/core/project-graph/project-graph.js:221:25)
    at createProjectGraph (/path/to/my/repo/node_modules/@nrwl/workspace/src/core/project-graph/project-graph.js:119:26)
    at Object.<anonymous> (/path/to/my/repo/node_modules/@nrwl/workspace/src/core/project-graph/project-graph.js:96:16)
    at Generator.next (<anonymous>)
    at /path/to/my/repo/node_modules/tslib/tslib.js:117:75
    at new Promise (<anonymous>)
    at Object.__awaiter (/path/to/my/repo/node_modules/tslib/tslib.js:113:16)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:10956) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
(node:10956) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Are buildable libraries broken at the moment? It seems odd that it's looking for tsconfig.json in the root, because nx doesn't create it and there aren't any config files pointing to it.

[brandonroberts]

What kind of library did you generate? The root tsconfig should be tsconfig.base.json

[steve-taylor]

React library. I ended up recreating the entire workspace and it worked.

[voznik]

@steve-taylor @brandonroberts the issue is with some/any invalid JSON syntax in tsconfig.base.json. I spent 2h today figuring out, that I have a trailing comma in one array of my path aliases.