Unique functions analyzer and optimizer

Overview

This tool lets you see how much unique functions you have in your JS bundle code and get rid of most of the duplicates.

This comes useful when your modern JS application bundle consists of duplicates at 20%..40% or more, effectively wasting the client & server resources (on serving the duplicate bytes and parsing the same code on browser).

Usage

Analysis

Run yarn analyze <your-input-js-file> --output <output-json-file>.

This will analyze your source JS file and write the analysis results to the provided output file.

Optimization

Automatic

Run yarn optimize <your-input-js-file> --output <output-json-file> --threshold <occurrences>.

This will analyze your source JS file, de-duplicate the function definitions with mode than <occurrences> duplicates and write the results to the provided output file.

Manual

First, analyze your bundle with yarn analyze.

Then, specify the list of function hashes you want to de-duplicate via yarn optimize <your-input-js-file> --output <output-json-file> --hashes <comma-seprated-hashes>.

This will analyze your source JS file and de-duplicate the function definitions specified in <comma-separated-hashes> argument and write the results to the provided output file.