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33 lines
905 B
33 lines
905 B
// Returns a wrapper function that returns a wrapped callback |
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// The wrapper function should do some stuff, and return a |
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// presumably different callback function. |
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// This makes sure that own properties are retained, so that |
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// decorations and such are not lost along the way. |
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module.exports = wrappy |
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function wrappy (fn, cb) { |
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if (fn && cb) return wrappy(fn)(cb) |
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if (typeof fn !== 'function') |
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throw new TypeError('need wrapper function') |
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Object.keys(fn).forEach(function (k) { |
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wrapper[k] = fn[k] |
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}) |
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return wrapper |
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function wrapper() { |
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var args = new Array(arguments.length) |
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for (var i = 0; i < args.length; i++) { |
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args[i] = arguments[i] |
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} |
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var ret = fn.apply(this, args) |
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var cb = args[args.length-1] |
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if (typeof ret === 'function' && ret !== cb) { |
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Object.keys(cb).forEach(function (k) { |
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ret[k] = cb[k] |
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}) |
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} |
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return ret |
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} |
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}
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