31 lines
645 B
JavaScript
31 lines
645 B
JavaScript
module.exports = parseArguments
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function isWritable(stream) {
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return typeof stream.write === "function" &&
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typeof stream.end === "function"
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}
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function parseArguments(req, res, opts, callback) {
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// (req, cb)
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if (typeof res === "function") {
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callback = res
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opts = {}
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res = null
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}
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// (req, res, cb)
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if (typeof opts === "function") {
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callback = opts
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opts = {}
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}
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// (req, opts, cb)
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if (res && !isWritable(res)) {
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opts = res
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res = null
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}
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// default (req, res, opts, cb)
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return { req: req, res: res, opts: opts, callback: callback }
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}
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