istanbuljs/nyc

Features

• Code Coverage - Instruments JavaScript and TypeScript source files to track executed lines, branches, and functions during test runs.
• Threshold Enforcements - Fails the build process when code coverage percentages fall below minimum target thresholds for branches, lines, and functions.
• Coverage Data Aggregators - Combines raw coverage data from separate test suites or independent runs into a single consolidated report.
• Code Instrumentation Utilities - Instruments source files during execution to collect real-time code coverage statistics.
• Source Code Mapping - Maps coverage data from transpiled code back to the original source files using source maps.
• Transpilation Mapping - Maps coverage data from compiled TypeScript or ES2015+ code back to original source files using source maps.
• Source Map Resolution - Preserves source maps during code rewriting to map coverage data from transpiled TypeScript or ES2015+ back to original lines.
• Runtime Module Hooking - Instruments source files on-the-fly by intercepting the Node.js module loading process with a custom require hook.
• Build Gating Tools - Acts as a validator that fails the build process when code coverage percentages fall below defined minimum thresholds.
• Code Coverage Tools - Provides a command-line tool to instrument JavaScript source files and track the execution of lines, branches, and functions.
• Test Runner Wrappers - Functions as a wrapper for Node.js test runners, intercepting the module loading process to collect coverage data.
• Test Runner Integrations - Connects with common testing frameworks to collect unified coverage data automatically via the command line.
• HTML Visualizations - Produces a browsable HTML report showing per-file code coverage with visual highlighting.
• Pre-instrumentation - Instruments source files ahead of time to facilitate coverage tracking via source maps.
• Subprocess Instrumentation - Captures and merges code coverage data from multiple child processes spawned during tests.
• TypeScript Instrumentation - Transpiles TypeScript source files to ensure compatible instrumentation and coverage tracking.
• Glob Pattern Selectors - Allows selecting source files for instrumentation using include and exclude glob patterns.
• Modern JavaScript Instrumentation - Transpiles modern JavaScript syntax to ensure compatible instrumentation and coverage tracking.
• Coverage Summaries - Provides coverage summaries and file-level statistics directly to the command line in text or TeamCity formats.
• Analysis Report Serialization - Serializes coverage analysis results into multiple human-readable and machine-readable formats.
• Reporting Plugins - Uses a plugin-based architecture to output coverage results in multiple formats including HTML, LCOV, JSON, and XML.
• Coverage Exclusions - Provides mechanisms to ignore specific lines, blocks, or files from coverage metrics using inline hints and configuration.
• Report Generators - Transforms raw coverage data into diverse report formats such as HTML, LCOV, JSON, and XML.
• Detailed JSON Reporting - Produces detailed JSON reports containing per-file coverage data for statements, functions, and branches.
• Summary Reports - Outputs a concise JSON summary containing aggregate coverage percentages.
• Test Coverage Collections - Captures and merges coverage metrics from child processes spawned during the execution of tests.
• Testing and Quality Assurance - Command line interface for code coverage.
• Testing Frameworks - CLI for Istanbul coverage.

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