Diffenator
List all files that have changed or that depend on a file that has changed. This is mainly useful to only run tests on code that has been modified.
Installation
npm i --save-dev diffenator
Usage
## List all files in ./test that have been modified with respect to master
npx diffenator HEAD -- test
Combining with mocha
npx diffenator HEAD -- test | xargs mocha
Example
Suppose that the layout of the project is the following
.
├── a.js
├── b.js
└── test
├── aTest.js
└── bTest.js
Where test/aTest.js depends on a.js and test/bTest.js depends on b.js. If we modify b.js then
# Modify b.js
echo "" >> b.js
# List all files in directory that have changed or that depend in a file that has changed
npx diffenator -- test
> test/bTest.js