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