eslint-config-niveus

ESLint is a popular JavaScript linter that helps developers maintain a consistent coding style and catch potential errors. It works by analyzing your code and providing warnings or errors based on a set of defined rules. To use ESLint in your project

Run linting:

npm run lint

Run linting with fixing:

npm run lint --fix

ESLint Configuration Rules Explanation

Here is an explanation for each ESLint rule in the provided configuration:

Indentation: Error if indentation is not 2 spaces.

Linebreak Style: Error if linebreak style is not set to "unix."

Quotes: Error for using anything other than single quotes, avoiding escape and disallowing template literals.

Semicolons: Error if semicolons are missing.

Comma Dangle: Error if there is no trailing comma in multiline object literals.

Comma Style: Error if commas are not placed at the end of the last property.

No Multi-Spaces: Error for multiple spaces, ignoring end-of-line comments.

No Unused Vars: Error for unused variables, ignoring specified patterns.

Prefer Const: Warning for using let or var instead of const when possible.

No Console: Turn off the restriction for using console statements.

No Duplicate Imports: Error if there are duplicate import statements.

Space Infix Ops: Error for spaces around infix operators.

Arrow Spacing: Error for spaces around arrow function arrows.

Comma Spacing: Error for spacing around commas in parameter lists and array literals.

Space Before Function Paren: Error for spacing before function parentheses.

Func Call Spacing: Error for spacing in function calls.

Space In Parens: Error for spaces inside parentheses.

Function Call Argument Newline: Error for inconsistent newlines in function calls.

Space Before Blocks: Error for spacing before blocks in functions and classes.

Keyword Spacing: Error for spacing around keywords.

Brace Style: Error for brace style not being "1tbs."

Object Curly Newline: Error for inconsistent newlines in object literals.

Max Lines: Error if a file exceeds 500 lines, skipping blank lines and comments.

Max Len: Error if a line exceeds 120 characters, ignoring specific cases.

EOL Last: Error if there's no newline at the end of the file.

ID Length: Error if variable and function names are shorter than 2 or longer than 30 characters.

Max Lines Per Function: Error if a function exceeds 50 lines.

No Var: Warning for the use of the var keyword.

No Redefine: Warning for redeclaring variables, including built-in globals.

No Shadow: Warning for variable shadowing, including functions.

Block Scoped Var: Warning for using var in block scope.

No Implicit Coercion: Warning for implicit type coercion.

No Use Before Define: Warning for using variables, functions, and classes before they are defined.

Array Callback Return: Warning for missing return statements in array methods.

Init Declarations: Warning for uninitialized variables (var without assignment).

No Loop Func: Warning for functions declared inside loops using var.

No Trailing Spaces: Error for trailing spaces at the end of lines.

Newline Before Return: Error for a newline before the return statement.

Newline Per Chained Call: Error for a newline per chained method call.

Object Property Newline: Error for a newline after each property in object literals.

Operator Linebreak: Error for placing line breaks before operators.

Spaced Comment: Error for spaces after the // or /* in a comment.

Key Spacing: Error for spacing between keys and values in object literals.

No Multiple Empty Lines: Error for multiple empty lines, with a maximum of 2, and 1 at the end of the file.

Jest No Identical Title: Error for identical Jest test titles.

Jest Valid Title: Error for Jest test titles that are not valid.

React In JSX Scope: Turn off the requirement to import React in JSX files.