Introduction to lcov-parse

lcov-parse is a powerful library for parsing lcov coverage files. Its flexible and easy-to-use API allows developers to extract coverage data programmatically, making it an essential tool for testing processes.

API Overview

Installation

npm install lcov-parse

Basic Usage

Below are some commonly used APIs with examples:

parse

The parse function reads an lcov report and returns a JSON object representing the coverage data.

  const lcovParse = require('lcov-parse');

  lcovParse('path/to/lcov.info', (err, data) => {
    if (err) {
      console.error(err);
      return;
    }
    console.log(data);
  });

parseStream

The parseStream function is used to parse lcov data from a readable stream.

  const fs = require('fs');
  const lcovParse = require('lcov-parse');

  const stream = fs.createReadStream('path/to/lcov.info');
  lcovParse.parseStream(stream, (err, data) => {
    if (err) {
      console.error(err);
      return;
    }
    console.log(data);
  });

parseText

The parseText function allows you to parse lcov data from a string.

  const lcovParse = require('lcov-parse');

  const lcovText = 'Your lcov data as a string';
  lcovParse.parseText(lcovText, (err, data) => {
    if (err) {
      console.error(err);
      return;
    }
    console.log(data);
  });

App Example Using lcov-parse

Let’s build a simple Node.js application that processes lcov files and outputs coverage data to the console.

Step 1: Setup Project

  mkdir lcov-parser-app
  cd lcov-parser-app
  npm init -y
  npm install lcov-parse

Step 2: Create Main Script

  const fs = require('fs');
  const lcovParse = require('lcov-parse');

  const filePath = 'path/to/lcov.info';

  lcovParse(filePath, (err, data) => {
    if (err) {
      console.error('Error parsing lcov:', err);
      return;
    }

    console.log('Coverage Data:', data);
  });

Conclusion

Using the lcov-parse library, you can easily integrate coverage data analysis into your workflow. Whether it’s reading data from files, streams, or strings, the API provides versatile options for handling coverage data.

Hash: 68ddd3f6a7d6c9fa5fb6b6b23cd0ba388d021f557a0271c5eb3ec1fbf76326ab