ionic 5 Uncaught (in promise): Error: Cannot find module 'tslib' Error: Cannot find module 'tslib code example

Example: add module tslib

// TypeScript 3.9.2 or later
npm install tslib
// TypeScript 3.8.4 or earlier
npm install tslib@^1 
// TypeScript 2.3.2 or earlier 
npm install tslib@1.6.1