ESLint plugin to update row numbers on each console.log


It's an ESLint plugin which automatically updates row numbers inside every console.log:



First, make sure eslint itself is installed among the dev dependencies. "i" below means install, "-D" below means "dev dependency" (as opposed to a normal dependency). Quick refresher — when you publish an npm package and somebody installs it, its dev dependencies don't get installed when they npm i your package. That's the point of separating dev and normal dependencies.

Both eslint and eslint-plugin-row-num are for your program's testing, so we install them as "dev" dependencies, via -D flag:

npm i -D eslint
npm i -D eslint-plugin-row-num

Some basics

Then, you need to configure ESLint to use the plugin.

As you know, ESLint is pluggable which is the reason why it won over predecessors JSLint and JSHint — ESLint runs only the rules you asked for, and at the warning levels you asked for.

We need to do the asking.

We'll use an ESLint configuration file opens in a new tab. If you don't have a config file yet, you can nip the config file from another project and tweak it or, you can use initiation script eslint --init. Mind you, eslint configs are dot files which are hidden by the system. It's best practice to make them visible opens in a new tab.

But now, some basics first.

For example, the following rule configuration row:

"row-num/correct-row-num": "error",


"set the rule "correct-row-num" from plugin "row-num" (which comes from npm package "eslint-plugin-row-num") to report findings at an "error" level.

Setup instructions

We need to add row-num to the plugins section of your .eslintrc configuration file, for example, here's a real config file we use — notice the "row-num" in "plugins" key:

"env": {
"es6": true,
"node": true
"extends": [
"parserOptions": {
"ecmaVersion": 2018,
"sourceType": "module"
"plugins": ["row-num"],
"ignorePatterns": [
"rules": {
"curly": "error",
"no-constant-condition": [
"checkLoops": false
"no-else-return": "error",
"no-inner-declarations": "error",
"no-unneeded-ternary": "error",
"no-useless-return": "error",
"no-var": "error",
"one-var": ["error", "never"],
"prefer-arrow-callback": "error",
"prefer-const": "error",
"prefer-template": "error",
"row-num/correct-row-num": "error",
"strict": "error",
"symbol-description": "error",
"yoda": [
"exceptRange": true

Reciting the ESLint documentation, rules can have different settings:

"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)

Which means, you can put 2 (as number, without quotes) or "error" (as string, so with quotes):

"rules": {
"row-num/correct-row-num": 2


"rules": {
"row-num/correct-row-num": "error"

Both are the same thing.


See it in the monorepo opens in a new tab, on GitHub.


To report bugs or request features or assistance, raise an issue on GitHub opens in a new tab.

Any code contributions welcome! All Pull Requests will be dealt promptly.


MIT opens in a new tab

Copyright © 2010–2021 Roy Revelt and other contributors

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