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/**
* Module dependencies.
*/
var AssertionError = require('assert').AssertionError
, callsite = require('callsite')
, fs = require('fs')
/**
* Expose `assert`.
*/
module.exports = process.env.NO_ASSERT
? function(){}
: assert;
/**
* Assert the given `expr`.
*/
function assert(expr) {
if (expr) return;
var stack = callsite();
var call = stack[1];
var file = call.getFileName();
var lineno = call.getLineNumber();
var src = fs.readFileSync(file, 'utf8');
var line = src.split('\n')[lineno-1];
var src = line.match(/assert\((.*)\)/)[1];
var err = new AssertionError({
message: src,
stackStartFunction: stack[0].getFunction()
});
throw err;
}