Upgrade to ESLint 7.x

[LinusU]

• Update minimum Node here
• Semi-blocked on [New] support eslint v7 jsx-eslint/eslint-plugin-react#2635
• Update to rules moved out from ESLint 7 eslint-config-standard#169
• Add new rules from ESLint 7.0.0 eslint-config-standard#170

We should also consider adding these new rules:

• https://eslint.org/docs/rules/default-case-last
• https://eslint.org/docs/rules/no-useless-backreference

ref: https://eslint.org/blog/2020/05/eslint-v7.0.0-released

[Raynos]

All of these changes are reasonable. I'm excited about bumping to eslint @ 7.

[evanplaice]

Is there anything specifically blocking progress on this?

The reason I ask is. ESLint isn't equipped to backport security fixes to the prior SemVer Major and another vulnerability was found in Lodash (ie which ESLint uses).

It'll probably be an easy fix (ie bump sub deps) but sometimes it isn't (ie the offending sub dep isn't maintained).

Keeping StandardJS in lockstep with ESLint's SemVer major can help this by ensuring any recent patches to ESLint are immediately available.

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Sorry in advance if this is annoying. I woleheartedly agree.

[mcdado]

When upgrading to 7.x, if you jump to 7.4 directly, could you consider adding this option? #1474

I contributed the feature myself to eslint so that it could be included in standard, if you agree 😉

[NemoStein]

In #1539 (referenced by @shadowspawn) I asked for ESLint 7.5 because of the Optional Chaining operator (and the Nullish Coalescing operator by extension).
And I think that the rules no-promise-executor-return and no-unreachable-loop (ESLint 7.3) are good rules to be added.
Also, no-loss-of-precision (ESLint 7.1.0) and sort-imports (ESLint 7.5), although probable breakers, should be parte of the ruleset.

[NemoStein]

Hey, guys, please... This issue must move on...
Using latest spec syntax is essencial to push JS applications to next level and Standard is a huge part of the community.
Please, don't let this update die. =D

[feross]

I'm working on this today.

[feross]

This will be released in standard v15.