Unmet dependencies warning during yarn install

[filippsen]

Environment/Browser

• node v10.5.0
• yarn 1.7.0
• npm 6.1.0
• Or simply via Docker image: node:latest (8753edeb1aa3)

Description

Unmet (missing?) dependencies warning during package installation.
The issue apparently hasn't been an offender in practice.
The warning is only flagged by yarn.

Steps to reproduce

yarn install

Expected result

Nothing.

Actual result

warning " > @fortawesome/[email protected]" has unmet peer dependency "prop-types@^15.5.10".
warning " > @fortawesome/[email protected]" has unmet peer dependency "react@^16.0.0".
warning " > [email protected]" has unmet peer dependency "webpack@^2.0.0 || ^3.0.0 || ^4.0.0".
warning " > [email protected]" has unmet peer dependency "react@>=0.14.0 || >15.0.0".
warning " > [email protected]" has unmet peer dependency "react@^15.x || ^16.x".

Reproducible

Can be consistently reproduced.

[filippsen]

Same happens when doing npm install, just with a slightly different message:

npm WARN @fortawesome/[email protected] requires a peer of react@^16.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@>=0.14.0 || >15.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a peer of react@^15.x || ^16.x but none is installed. You must install peer dependencies yourself.

[filippsen]

Additional dependencies were added since then:

warning " > [email protected]" has unmet peer dependency "react@^15.5.x || ^16.x".
warning " > [email protected]" has unmet peer dependency "react-dom@^15.5.x || ^16.x".

warning " > [email protected]" has unmet peer dependency "react@^0.14.0 || ^15.0.0-0 || ^16.0.0-0".

warning " > [email protected]" has unmet peer dependency "babel-core@^6.0.0 || ^7.0.0-0".

warning " > [email protected]" has unmet peer dependency "babel-core@6 || 7 || ^7.0.0-alpha || ^7.0.0-beta || ^7.0.0-rc".

warning "preact-cli > [email protected]" has unmet peer dependency "babel-core@6".

[javier-tarazaga]

Solved in #210