Angular schematics for library: building schematics gives error in angular 10

Question

As per Angular doc on schematics for library https://angular.io/guide/schematics-for-libraries I tried running script to build schematics with npm run build https://angular.io/guide/schematics-for-libraries#building-your-schematics

"scripts": {
    "build": "../../node_modules/.bin/tsc -p tsconfig.schematics.json",
    "copy:schemas": "cp --parents schematics/*/schema.json ../../dist/my-lib/",
    "copy:files": "cp --parents -p schematics/*/files/** ../../dist/my-lib/",
    "copy:collection": "cp schematics/collection.json ../../dist/my-lib/schematics/collection.json",
    "postbuild": "npm run copy:schemas && npm run copy:files && npm run copy:collection"
  }

It logs below error

'..' is not recognized as an internal or external command,
operable program or batch file.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! library-name build: `../../node_modules/.bin/tsc -p tsconfig.schematics.json`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the library-name build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\PC\AppData\Roaming\npm-cache\_logs\2020-09-25T11_20_07_784Z-debug.log

It is giving error while executing ../../node_modules/.bin/tsc -p tsconfig.schematics.json

P.S. I'm using Angular-10 to create library. Thanks.