js-code-linter

js-code-linter is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code.It is inspired from ESlint, JSLint and JSHint with a few exceptions:

• js-code-linter uses Espree for JavaScript parsing.
• js-code-linter uses an AST to evaluate patterns in code.
• js-code-linter is completely pluggable, every single rule is a plugin and you can add more at runtime.

Installation and Usage

Prerequisites: Node.js (^12.22.0, ^14.17.0, or >=16.0.0) built with SSL support. (If you are using an official Node.js distribution, SSL is always built in.)

To install run this command:

npm i js-code-linter

After that, you can run js-code-linter on any file or directory like this:

node_modules/js-code-linter/src/index.js --file <file-path.js>

Configuration

To configure in your project add below line in package.json.

"lint": "node_modules/js-code-linter/src/index.js",

After that, you can run js-code-linter in project using npm run lint commad.

example:

npm run lint --  --file <file-path.js>

What js-code-linter lints ?

js-code-linter performs linting on your JavaScript code, primarily focusing on identifier (variable) declarations and the use of quotes.

It generates a new file <file-name>.linted.js with all the tranformation.

Also give error message with line of code where the lint issue is present.

Identifier Transformations

Variable Declaration Type Optimization:

1. js-code-linter automatically optimizes:

   • variable declarations by transforming var identifiers to let or const as needed.

2. Reassignment Analysis:

   • It identifies variables whose values are reassigned and transforms them from var or const to let.

3. Constant Declaration:

   • Variables that are never reassigned are transformed from var or let to const for better code consistency.

Quote Transformation

• Double to Single Quote Conversion: js-code-linter convert double quotes "" to single quotes '' for consistent quoting style.

Output File

• After linting your code, js-code-linter generates a new file named <file-name>.linted.js, which includes all the transformations. This file is created in the same directory as the original file.

Error Messages

• js-code-linter provides error messages that pinpoint the location of linting issues in your code. Each error message includes the clickable line & column number, making it easy to identify and fix problems in your code.