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You should not install the next
branch of ng2-charts, that is an older version as the most recent one, also when using ng2-charts version 3.0 or above you need to make sure you have at least version 3.0 of Chart.js installed, it does not work with version 2.
Using npm i chart.js
should not give you 2.9.4 as you claimed, it should install the latest version but to be sure you can just specify the latest versions for both:
npm i chart.js@3.8.2
npm i ng2-charts@3.1.2
Source:stackexchange.com