Fastest ever folder of ./index.js.map making for source map to files extractor, quick and dirty.

unpack_js_map.py

import json
import os


def extract_source_code(map_file_path):
    """
    Extracts source code from a webpack source map file.
    Args:
        map_file_path (str): Path to the source map file.
    Returns:
        None. Creates a folder structure with extracted source files.
    """
    print(map_file_path)
    with open(map_file_path, "r") as map_file:
        map_data = json.load(map_file)

    output_dir = os.path.dirname(map_file_path)
    # os.makedirs(output_dir, exist_ok=True)

    for i, source_path in enumerate(map_data["sources"]):
        # Handle webpack:// URLs
        if source_path.startswith("webpack://"):
            source_path = source_path.split("webpack://")[1]
        try:
            source_path = source_path.split(".\\src")[1]
        except Exception as e:
            continue

        # Extract the source file name
        source_file_name = os.path.basename(source_path)
        pathways = output_dir  + source_path.split(source_file_name)[0]

        # Extract the source content
        try:
            source_content = map_data["sourcesContent"][i]
        except Exception as e:
            print(f"Error decoding source content: {e}")
            continue
        # Create subdirectories for nested paths
        source_file_dir = os.path.join(pathways)
        os.makedirs(source_file_dir, exist_ok=True)

        # Write the source code to the file
        source_file_path = (os.path.join(source_file_dir, source_file_name).replace(" ", "_").replace(
                '"', "_").replace("'", "_").replace("?", "_"))
        with open(source_file_path, "w") as source_file:
            source_file.write(source_content)


if __name__ == "__main__":
    # get all files with .js.map from the . folder and extracct all of them...
    for root, dirs, files in os.walk(os.getcwd()):
        for file in files:
            if file.endswith(".js.map"):
                extract_source_code(os.path.join(root, file))
                print(f"Source code for {file} extracted.")