node2nix angular build error

builder for '/nix/store/j8qqiyhm82f6yzbfbzk7jswwqq0fm6rs-node_copilot-frontend-0.0.0.drv' failed with exit code 1; last 10 log lines:
   @ multi ./src/main.ts
  ERROR in ./src/environments/environment.ts
  Module build failed (from ./node_modules/@ngtools/webpack/src/index.js):
  Error: /nix/store/31gbvi4lfbcfy4h2bn0k5k1qwv08wgd6-node_copilot-frontend-0.0.0/lib/node_modules/copilot-frontend/src/environments/environment.ts is missing from the TypeScript compilation. Please make sure it is in your tsconfig via the 'files' or 'include' property.
  The missing file seems to be part of a third party library. TS files in published libraries are often a sign of a badly packaged library. Please open an issue in the library repository to alert its author and ask them to package the library using the Angular Package Format (https://goo.gl/jB3GVv).
      at AngularCompilerPlugin.getCompiledFile (/nix/store/31gbvi4lfbcfy4h2bn0k5k1qwv08wgd6-node_copilot-frontend-0.0.0/lib/node_modules/copilot-frontend/node_modules/@ngtools/webpack/src/angular_compiler_plugin.js:909:23)
      at plugin.done.then (/nix/store/31gbvi4lfbcfy4h2bn0k5k1qwv08wgd6-node_copilot-frontend-0.0.0/lib/node_modules/copilot-frontend/node_modules/@ngtools/webpack/src/loader.js:41:31)
      at process._tickCallback (internal/process/next_tick.js:68:7)
   @ ./src/main.ts 2:0-57 5:4-15
   @ multi ./src/main.ts
[4 built (1 failed), 0.0 MiB DL]
error: build of '/nix/store/j8qqiyhm82f6yzbfbzk7jswwqq0fm6rs-node_copilot-frontend-0.0.0.drv' failed