eslint-config-moneyforward 5 is here‼

[wakamsha]

eslint-config-moneyforward 5 has been released. This is a major update half year after the previous release, so it includes many attractive features.

• Support ESLint 9
  • Update most of ESLint plugin versions
• Add a ruleset powered by eslint-plugin-unicorn into essentials config

Support ESLint 9

The current version of eslint, v9, is now officially supported.
ESLint v8 will reach EOL in October 2024, so we are two months late, but we are happy to finally be able to provide the v9 supported version to everyone.

Version support policy and ESLint v8.x end of life - ESLint - Pluggable JavaScript Linter

ESLint will default to Flat Config from v9, and eslintrc (legacy config) will be deprecated. In addition, eslintrc will be completely removed in ESLint v10, so we recommend that you migrate to Flat Config now.

Migrate to Flat Config

Important

With this major update, the required versions for Node.js, ESLint, and TypeScript have been raised as follows:

	v4	v5
Node.js	^18.18.0 || ^20.0.0	^18.18.0 || ^20.9.0 || >=21.1.0
ESLint	^8.56.0	^8.57.0 || ^9.0.0
TypeScript	^4.7.5 || ^5.0.0	^4.8.4 || ^5.0.0

Add a ruleset powered by eslint-plugin-unicorn into essentials config

eslint-plugin-unicorn is a plugin that provides over 100 rules that extend the rule concepts provided by the ESLint core. This will help you properly use variable and function naming conventions, regular expressions, modern JavaScript APIs, and more.

Biome also uses part of this plugin's rule set, so we can expect it to be powerful.

Rules sources | Biome

We've added useful rules to eslint-config-moneyforward/essentials. So you don't need to rewrite your configuration files to benefit from this. Just upgrade this library and you're done.

References

• Tracking: ESLint v9 support #269
• Add a ruleset powered by unicorn plugin into essentials config #309