EmacsWiki: Flymake Java Script: "There are multiple options for checking Javascript syntax that can be used within flymake. The javascript engines SpiderMonkey and Rhino can both check Javascript syntax. Alternatively, you can use Douglas Crockford’s rather handy JSLint, which is much less forgiving of bad syntax, and can enforce a sensible coding style. Another option is JSHint, which is a fork of JSLint, modified to be not as strict and more configurable in its requirements than the original. The following describe some of these options.
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