rjsmin: Fast Javascript Minifier for Python

Warnings

• gotcha rJSmin performs no error detection. Unterminated string, regex, and comment literals are treated as regular JavaScript code and minified as such, which can lead to invalid output without explicit error messages.
  Fix: Ensure your JavaScript code is syntactically correct and well-formed before passing it to rjsmin. Use linters or validate the code beforehand.
• gotcha rJSmin does not handle streams and requires the complete JavaScript code as a single string input. It cannot process code incrementally from a file stream.
  Fix: Read the entire JavaScript file content into a string before passing it to the `jsmin` function.
• gotcha While generally compatible with jsmin.c, rJSmin has subtle behavioral differences. For example, control characters in string/regex literals are untouched, newlines are generally disallowed in string/regex literals (except for ECMA-5 line continuations), and sequences like '+ +' or '- -' are not collapsed to '++' or '--'.
  Fix: Thoroughly test minified output if exact byte-for-byte compatibility or specific minification behaviors (beyond simple whitespace removal) with the original jsmin.c are critical for your application.

Install

• pip install rjsmin Install with pip

Imports

• jsmin

  from rjsmin import jsmin

Quickstart

The `jsmin` function takes a string containing JavaScript code and returns its minified version as a string. An optional `keep_bang_comments` parameter allows preserving comments starting with an exclamation mark.

from rjsmin import jsmin

js_code = """\
function hello( name ) {
    /* a comment */
    return 'Hello, ' + name + '!';
}
"""

minified_code = jsmin(js_code)
print(minified_code)
# Expected output: function hello(name){return'Hello,'+name+'!'}