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56 lines
825 B
56 lines
825 B
3 years ago
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/*!
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*
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* before
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*
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* before decorator factory
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*
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* MIT
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*
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*/
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/**
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* Module dependencies.
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*/
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var slice = [].slice;
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/**
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* Expose `before`.
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*/
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module.exports = before;
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/**
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* Captures `context` to be used by decorator.
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*
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* @param {Object} [context]
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* @return {Function}
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* @api public
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*/
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function before(context){
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return decorator;
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/**
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* Decorates `method` using `outer`.
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*
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* @param {Function} outer
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* @return {Object} this
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* @api public
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*/
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function decorator(method, outer){
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var inner = context[method];
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context[method] = function(){
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var args = slice.call(arguments);
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var fn = args[args.length - 1];
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return outer.call(context, args, function(err){
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if (err) return fn(err);
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inner.apply(context, args);
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});
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};
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return this;
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}
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}
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