tessl/npm-loopback--build

A comprehensive set of build tools and configurations for LoopBack 4 and TypeScript projects providing CLI commands for compilation, linting, testing, and coverage

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Overview

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Code Linting

Name: tessl/npm-loopback--build
Author: tessl

ESLint integration with automatic configuration discovery and LoopBack-specific rules for maintaining code quality and consistency.

Capabilities

lb-eslint Command

Runs ESLint with automatic configuration discovery and default file extensions.

CLI Usage:

# Lint current directory
lb-eslint .

# Lint specific files
lb-eslint src/index.ts src/utils.ts

# Lint with fix
lb-eslint --fix .

# Report unused disable directives
lb-eslint --report-unused-disable-directives .

# Lint specific extensions
lb-eslint --ext .js,.jsx,.ts,.tsx src/

Note: ESLint functionality is only available through the lb-eslint CLI command. It is not exported as a programmatic function from the main module.

Configuration Discovery

Automatically discovers ESLint configuration files in the project.

Configuration Search Order:

.eslintrc.js in project root
.eslintrc.json in project root
Falls back to @loopback/build/config/.eslintrc.js

Default Configuration:

// @loopback/build/config/.eslintrc.js
module.exports = {
  extends: '@loopback/eslint-config',
};

Ignore File Support

Automatically discovers and uses ESLint ignore files.

// Automatically uses .eslintignore if present in project root
// Falls back to @loopback/build/config/.eslintignore

Default Ignore Patterns:

node_modules
dist

File Extension Handling

Automatically sets default file extensions if not specified.

// Default extensions: .js,.ts
// Only applied if --ext option is not provided

Extension Examples:

# Uses default extensions (.js,.ts)
lb-eslint src/

# Custom extensions override defaults
lb-eslint --ext .js,.jsx,.ts,.tsx src/

Command Line Option Passthrough

All ESLint command line options are supported and passed through.

interface ESLintOptions {
  "--fix": boolean;                    // Automatically fix problems
  "--fix-dry-run": boolean;           // Show fixes without applying
  "--ext": string;                    // File extensions to lint
  "-c" | "--config": string;          // Configuration file path
  "--ignore-path": string;            // Ignore file path
  "--report-unused-disable-directives": boolean; // Report unused disable comments
  "--max-warnings": number;           // Maximum number of warnings allowed
  "--output-file": string;            // Output file for results
  "--format": string;                 // Output format (stylish, json, etc.)
  "--quiet": boolean;                 // Report errors only
  "--cache": boolean;                 // Enable result caching
  "--cache-location": string;         // Cache file location
}

Integration with LoopBack ESLint Config

Uses @loopback/eslint-config for consistent code style across LoopBack projects.

Features of @loopback/eslint-config:

TypeScript support with type-aware rules
Consistent formatting rules aligned with Prettier
Best practices for Node.js and LoopBack development
Import/export validation
Accessibility rules for web components

Usage Examples

Command Line Usage:

# Basic linting with default configuration
lb-eslint .

# Fix issues automatically
lb-eslint --fix src/

Package.json Integration:

{
  "scripts": {
    "lint": "lb-eslint --report-unused-disable-directives .",
    "lint:fix": "lb-eslint --fix .",
    "lint:check": "lb-eslint ."
  }
}

Custom Configuration:

# Use custom config file
lb-eslint -c .eslintrc.custom.js src/

# Use custom ignore file
lb-eslint --ignore-path .eslintignore.custom src/

# Lint specific file types
lb-eslint --ext .ts,.d.ts src/

Error Handling

ESLint errors are properly propagated and handled.

// Process exits with non-zero code on lint errors
// Warnings do not cause process exit unless --max-warnings is exceeded
// Configuration errors are reported with helpful messages