JavaScript Tools

JS Utilities:
Transpiling / Type Checking (ES to ES):
Code-analysis Engine:
Linting/Hinting & Style Linter:
Unit Testing:
Testing Assertions for Unit Testing:
Test Spies, Stubs, and Mocks for Unit Testing:
Code Formater/Beautifier:
Performance Testing:
Visualization, Static Analysis, Complexity, Coverage Tools:
Sharable/Runnable Code Editors:
Online Regular Expression Editors/Visual Tools:
Authoring Convention Tools:

Most Depended upon Packages on NPM: