How do I configure JSLint to allow bitwise operators?

Add the /*jslint bitwise*/ directive at the top of your JavaScript file. This tells JSLint to permit bitwise operations, which are otherwise flagged as warnings due to potential confusion.

JSLint vs ESLint: which should I choose for a new project?

JSLint is ideal for teams valuing strict, opinionated standards and integrated coverage, while ESLint offers more flexibility with customizable rules and a vast plugin ecosystem. Consider your team's tolerance for rigidity and need for modern tooling.

How to ignore a specific warning on a single line in JSLint?

Use the //jslint-ignore-line comment at the end of the line to suppress non-fatal warnings. For example, eval('1'); //jslint-ignore-line will ignore the eval warning on that line.

Does JSLint support TypeScript or JSX files?

No, JSLint is designed for plain JavaScript and does not natively support TypeScript or JSX syntax. You would need to use transpilers or other linters for those languages.

How to generate a V8 coverage report from npm tests with JSLint?

Use the v8_coverage_report option in shell commands or the v8CoverageReportCreate API, specifying include and exclude patterns to filter files, as detailed in the quickstart section with examples for Node.js programs.

Can JSLint be used with React or Vue.js projects?

JSLint can lint JavaScript files in these projects, but it may not handle JSX or framework-specific patterns without custom directives or pre-processing. Integration might require additional tooling.

How to integrate JSLint into VSCode for real-time linting?

Install the vscode-jslint extension from the marketplace, then use right-click menus or key bindings like Ctrl+Shift+J L to lint files, as described in the quickstart guide with screenshots.

Open-Awesome

JSLint

UnlicenseJavaScriptv2026.6.30

A JavaScript code quality and coverage tool that enforces strict coding standards and generates test coverage reports.

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3.7k stars472 forks0 contributors

What is JSLint?

JSLint is a JavaScript code quality and coverage tool that analyzes source code for errors, enforces strict coding standards, and generates test coverage reports. It helps developers write cleaner, more reliable JavaScript by identifying problematic patterns and ensuring consistent style.

Target Audience

JavaScript developers and teams who prioritize code quality, maintainability, and comprehensive test coverage in their projects.

Value Proposition

Developers choose JSLint for its rigorous enforcement of coding conventions, integrated coverage reporting, and its philosophy of treating style as a foundation for creative expression rather than a constraint.

Overview

JSLint, The JavaScript Code Quality and Coverage Tool

Use Cases

Best For

Enforcing strict JavaScript coding standards in legacy or new codebases
Generating V8 coverage reports to analyze test suite effectiveness
Integrating real-time linting into editors like Vim, VSCode, and CodeMirror
Identifying undeclared variables and potential errors in JavaScript code
Maintaining consistent code style across team projects
Analyzing code quality for browser, Node.js, or CouchDB environments

Not Ideal For

Projects heavily using modern JavaScript features like async/await without explicit directive configuration
Teams preferring highly configurable linters with plugin ecosystems like ESLint
Codebases with established ESLint setups where migration would be disruptive
Developers seeking automatic code fixes or suggestions, as JSLint only reports issues

Pros & Cons

Pros

Integrated Coverage Reporting

Combines static analysis with V8 coverage reports in one tool, providing a unified workflow for code quality and test coverage, as shown in the shell command examples for generating reports.

Directive-Based Configuration

Uses special comments like /*jslint*/ and /*global*/ for fine-grained, per-file control over linting rules and environment settings, allowing tailored adjustments.

Multi-Environment Support

Configurable via directives for browser, Node.js, CouchDB, and other environments, making it adaptable to various project types without separate configurations.

Editor Integration

Includes wrappers for Vim, VSCode, and CodeMirror, enabling real-time linting within popular editors, with detailed quickstart guides for setup.

Cons

Rigorous and Opinionated

Enforces a strict, predefined coding style that may conflict with team preferences, requiring directives to relax rules, which can clutter code with configuration comments.

Complex Coverage Setup

Coverage reporting involves intricate exclude/include patterns in shell commands, as demonstrated in the examples, which can be error-prone and difficult to maintain.

Limited Extensibility

Lacks a plugin ecosystem like ESLint, relying solely on built-in checks that may not cover all modern frameworks or custom use cases without workarounds.

Frequently Asked Questions

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