eslint semi rule：为什么规则配置中有“2”？

Question

ESLint says to use this config to enforce semicolons.

semi: [2, "always"]

What is the meaning of the 2?

Answer 1

As the docs say , for each rule, you can have:

• "off" or 0 - turn the rule off
• "warn" or 1 - turn the rule on as a warning (doesn't affect exit code)
• "error" or 2 - turn the rule on as an error (exit code is 1 when triggered)

So the 2 tells ESLint to treat violations of the rule as an error.

You could, equivalently, do

semi: ['error', "always"]

which might make more sense at a glance.