npm install gives warnings

[joelanman]

In training we have found that the warnings from npm install can confuse people, thinking that something has gone wrong.

Update as of 2/1/2019, the warnings are:

npm WARN deprecated postinstall-build@5.0.3: postinstall-build's behavior is now built into npm! You should migrate off of postinstall-build and use the new `prepare` lifecycle script with npm 5.0.0 or greater.

npm WARN deprecated kleur@2.0.2: Please upgrade to kleur@3 or migrate to 'ansi-colors' if you prefer the old syntax. Visit <https://github.com/lukeed/kleur/releases/tag/v3.0.0\> for migration path(s).

npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.

npm WARN acorn-jsx@5.0.1 requires a peer of acorn@^6.0.0 but none is installed. You must install peer dependencies yourself.

[joelanman]

The kleur issue is apparently fixed in Jest 24, currently in Alpha:

jestjs/jest#7430

https://github.com/facebook/jest/releases

[joelanman]

circular-json is an open issue in eslint, used by standard

eslint/eslint#11052

[aliuk2012]

npm WARN deprecated postinstall-build@5.0.3: postinstall-build's behavior is now built into npm! You should migrate off of postinstall-build and use the new 'prepare' lifecycle script with npm 5.0.0 or greater.

Should be addresses once this issue has closed mozilla/nunjucks#1167

[joelanman]

The acorn warning appears to be a bug in npm:

eslint/eslint#11018 (comment)

Workaround here:

eslint/espree#393 (comment)

Might be worth considering if this is a bug in npm that might not be fixed for a while

[joelanman]

I think all warnings are gone currently