coverage-diff

What it does

• Accepts base-summary.json and head-summary.json
• Diffs the two jsons and outputs info about
  • Percentage of changed coverage (in changed/added files)
  • Formatted as markdown table
• Fail if coverage decreases on a file (check on percentage) for any of the lines/func/statements/branches. Can  be configured to only check some criteria.
• Separate threshold for new files newFileCoverageThreshold, defaults to coverageThreshold if not passed
• Written in Typescript.

Usage

import fs from 'fs';
import { diff as coverageDiff } from 'coverage-diff';

const base = JSON.parse(fs.readFileSync('./base-summary.json'));
const head = JSON.parse(fs.readFileSync('./head-summary.json'));
const diff = coverageDiff(base, head);

console.log(diff.diff);
console.log(diff.results);
console.log(diff.regression);

Out:

Ok	File	Lines	Branches	Functions	Statements
🔴	file1	80% (+10%)	14% (-30%)	3% (+20%)	20% (-10%)
✅	file2	20% (+10%)	8% (-30%)	2% (-20%)	5% (-10%)

API at https://flaviusone.github.io/coverage-diff/