Transform form JavaScript's ES6 `import` to `require`.

to_require.py

import re

def to_require(import_str):
    ''' Transform form JavaScript's ES6 `import` to `require`.

    >>> to_require("import webpack from 'webpack'")
    "const webpack = require('webpack')"

    >>> to_require('import webpack from "webpack"')
    'const webpack = require("webpack")'

    >>> to_require("import webpack from 'webpack';")
    "const webpack = require('webpack');"

    >>> to_require("import  webpack from 'webpack'")
    "const webpack = require('webpack')"
    >>> to_require("import  webpack  from 'webpack'")
    "const webpack = require('webpack')"
    >>> to_require("import  webpack  from  'webpack'")
    "const webpack = require('webpack')"
    >>> to_require("import webpack from 'webpack' ")
    "const webpack = require('webpack') "

    >>> to_require("import ProgressBarPlugin from 'progress-bar-webpack-plugin';")
    "const ProgressBarPlugin = require('progress-bar-webpack-plugin');"
    '''

    return re.sub(r'import\s+(\w+)\s+from\s+([\'"])([\w-]+)[\'"]', r'const \1 = require(\2\3\2)', import_str)


    # require_str = import_str.replace('import ', 'const ').replace('from ', '= require(')
    # semicolon = re.sub(r';$', ');', require_str);
    # return re.sub(r'([\'"])$', r'\1)', semicolon)

if __name__ == '__main__':
    import doctest
    doctest.testmod()