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JavaScript formatter

Pretty-print JavaScript with two spaces, four spaces, or tabs, or minify it to one line, using a string and comment aware scanner rather than a full parser.

Paste some JavaScript to see it formatted.

This is a token scanner, not a parser. Strings, template literals (including $ {...} expressions), regex literals, and comments are copied through verbatim, and keywords keep their case. Statements that relied on a newline for automatic semicolon insertion after return, throw, break, continue, or yield get an explicit semicolon so the output keeps its meaning. A clean run is a good sign, not a guarantee that the code would parse; exotic syntax may come out imperfect.
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