Broken build with NPM 7

[Serjlee]

If you try to use npm install with NPM 7 (default version for Node 16-LTS) and arduino/arc you'll get:

Expand error stack

16:53:23.032 | npm WARN ERESOLVE overriding peer dependency
-- | --
16:53:23.033 | npm WARN While resolving: [email protected]
16:53:23.033 | npm WARN Found: [email protected]
16:53:23.033 | npm WARN node_modules/react
16:53:23.033 | npm WARN   react@"^17.0.2" from the root project
16:53:23.034 | npm WARN   95 more (@arduino/arc, @bcmi-lab/space-select, @emotion/core, ...)
16:53:23.034 | npm WARN
16:53:23.034 | npm WARN Could not resolve dependency:
16:53:23.035 | npm WARN peer react@"^0.14.0 \|\| ^15.0.0 \|\| ^16.0.0" from [email protected]
16:53:23.035 | npm WARN node_modules/react-autosize-textarea
16:53:23.035 | npm WARN   react-autosize-textarea@"^7.1.0" from @arduino/[email protected]
16:53:23.035 | npm WARN   node_modules/@arduino/arc
16:53:23.035 | npm WARN
16:53:23.036 | npm WARN Conflicting peer dependency: [email protected]
16:53:23.036 | npm WARN node_modules/react
16:53:23.036 | npm WARN   peer react@"^0.14.0 \|\| ^15.0.0 \|\| ^16.0.0" from [email protected]
16:53:23.036 | npm WARN   node_modules/react-autosize-textarea
16:53:23.036 | npm WARN     react-autosize-textarea@"^7.1.0" from @arduino/[email protected]
16:53:23.036 | npm WARN     node_modules/@arduino/arc
16:53:23.037 | npm WARN ERESOLVE overriding peer dependency
16:53:23.037 | npm WARN While resolving: [email protected]
16:53:23.037 | npm WARN Found: [email protected]
16:53:23.037 | npm WARN node_modules/react-dom
16:53:23.038 | npm WARN   react-dom@"^17.0.2" from the root project
16:53:23.038 | npm WARN   14 more (@arduino/arc, @bcmi-lab/space-select, ...)
16:53:23.038 | npm WARN
16:53:23.038 | npm WARN Could not resolve dependency:
16:53:23.038 | npm WARN peer react-dom@"^0.14.0 \|\| ^15.0.0 \|\| ^16.0.0" from [email protected]
16:53:23.038 | npm WARN node_modules/react-autosize-textarea
16:53:23.039 | npm WARN   react-autosize-textarea@"^7.1.0" from @arduino/[email protected]
16:53:23.039 | npm WARN   node_modules/@arduino/arc
16:53:23.039 | npm WARN
16:53:23.039 | npm WARN Conflicting peer dependency: [email protected]
16:53:23.039 | npm WARN node_modules/react-dom
16:53:23.039 | npm WARN   peer react-dom@"^0.14.0 \|\| ^15.0.0 \|\| ^16.0.0" from [email protected]
16:53:23.039 | npm WARN   node_modules/react-autosize-textarea
16:53:23.040 | npm WARN     react-autosize-textarea@"^7.1.0" from @arduino/[email protected]
16:53:23.040 | npm WARN     node_modules/@arduino/arc
16:53:23.080 | npm ERR! code ERESOLVE
16:53:23.164 | npm ERR! ERESOLVE could not resolve
16:53:23.165 | npm ERR!
16:53:23.165 | npm ERR! While resolving: [email protected]
16:53:23.165 | npm ERR! Found: [email protected]
16:53:23.165 | npm ERR! node_modules/react
16:53:23.165 | npm ERR!   react@"^17.0.2" from the root project
16:53:23.165 | npm ERR!   peer react@"^17.0.2" from @arduino/[email protected]
16:53:23.165 | npm ERR!   node_modules/@arduino/arc
16:53:23.166 | npm ERR!     @arduino/arc@"^0.10.0" from the root project
16:53:23.166 | npm ERR!   94 more (@bcmi-lab/space-select, @emotion/core, ...)
16:53:23.166 | npm ERR!
16:53:23.166 | npm ERR! Could not resolve dependency:
16:53:23.166 | npm ERR! peer react@"^15.3.0 \|\| ^16.0.0-alpha" from [email protected]
16:53:23.166 | npm ERR! node_modules/react-virtualized
16:53:23.166 | npm ERR!   react-virtualized@"^9.22.3" from the root project
16:53:23.166 | npm ERR!
16:53:23.166 | npm ERR! Conflicting peer dependency: [email protected]
16:53:23.167 | npm ERR! node_modules/react
16:53:23.167 | npm ERR!   peer react@"^15.3.0 \|\| ^16.0.0-alpha" from [email protected]
16:53:23.167 | npm ERR!   node_modules/react-virtualized
16:53:23.167 | npm ERR!     react-virtualized@"^9.22.3" from the root project
16:53:23.167 | npm ERR!
16:53:23.167 | npm ERR! Fix the upstream dependency conflict, or retry
16:53:23.167 | npm ERR! this command with --force, or --legacy-peer-deps
16:53:23.167 | npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
16:53:23.168 | npm ERR!
16:53:23.168 | npm ERR! See /opt/buildhome/.npm/eresolve-report.txt for a full report.
16:53:23.168 |  
</pre>

Suggested fix:
Ditch/upgrade abandonded/outdated dependencies

Suggested temporary fix:
Document this issue in the README, and suggest the use of the--legacy-peer-deps flag or legacy-peer-deps=true in .npmrc