npm WARN … requires a peer of … but none is installed. You must install peer dependencies yourself

Question

I tried to run a project downloaded from github. Unfortunately, during npm install the following warnings were shown. I tried to change the version based on thi

Answer 1

For each error of the form:

npm WARN {something} requires a peer of {other thing} but none is installed. You must install peer dependencies yourself.

You should:

$ npm install --save-dev "{other thing}"

Note: The quotes are needed if the {other thing} has spaces, like in this example:

npm WARN rollup-plugin-uglify@6.0.3 requires a peer of rollup@>=0.66.0 <2 but none was installed.

Resolved with:

$ npm install --save-dev "rollup@>=0.66.0 <2"