Python to Javascript language

I have written large Python projects in the past, looking into converting some to javascript.

Links

• https://www.transcrypt.org/

setup transcrypt

We have to use python virtual environment for transcrypt to function correctly.

Now install transcrypt

pip install transcrypt

converting to javascript

have a python file test-trans.py

import os
from pathlib import Path

inifile = os.path.join(Path.home(), ".imagesel", "config.ini")
print(inifile)

now test it with python

py test-trans.py

in order to use os and pathlib we need to replace them with equivalent javascript calls using stubs. we will create stubs in dir called stubs these are special python files that can use javascript libraries.

os.py

p = require('path')

class path:
    def join(*args):
        return p.join(*args)

pathlib.py

os = require ('os')

class Path:
    def home():
        return os.homedir()

Now we can convert them to javascript

python -m transcrypt -b -n ..\test-trans.py

This will produce a directory called __target__ with all the javascript files in it.

converting to a node bundle

Now initialize node environment and install rollup

npm init // accept defaults
npm i rollup

Next we need to use rollup to bundle them for node,

node_modules\.bin\rollup .\__target__\test-trans.js --o bundle.js --f cjs

Now test it with node

node bundle.js

We get the same result.