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copied!<p>Thanks for all the ideas, I ended up just doing text replacement in the build script that outputs the JS, basically replacing $EVAL$ with eval, after everything has been compressed. I was hoping for a purely JS way, but with so many different eval browser implementations, it's probably better to just leave eval alone</p> <p>But based on Dimitar's answer and some fiddling around, here's what I found. Seems like the reason why this['eval'] wasn't work is because the place where it's happening, in MooTools JSON.decode, is also a inside a Hash:</p> <pre><code>var JSON = new Hash({ // snip snip decode: function(string, secure){ if ($type(string) != 'string' || !string.length) return null; if (secure && !(/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(string.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, ''))) return null; return this.eval('(' + string + ')'); // Firefox says: TypeError: this.eval is not a function } }); </code></pre> <p>However, if I store the "top level" local scope (all the code, including mootools, runs inside an anonymous function), then it works:</p> <pre><code>var TOP = this; var JSON = new Hash({ // snip snip decode: function(string, secure){ if ($type(string) != 'string' || !string.length) return null; if (secure && !(/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(string.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, ''))) return null; return TOP.eval('(' + string + ')'); // All good, things run within the desired scope. } }); </code></pre> <p>However this doesn't work in Safari, so bottom line is, what I was trying to do can't be done cross-compatibly. eval is a special touchy function and every browser treats it differently.</p>

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