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node_modules/inspect-function/lib/inspect-function.js

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+#!/usr/bin/env node
+'use strict';
+
+const splitSkip = require('split-skip');
+const unpackString = require('unpack-string');
+const stringifyParameters = require('stringify-parameters');
+const { inspectParameters, getParametersNamesFromInspection } = require('inspect-parameters-declaration');
+
+/**
+ * Inspects a function and returns information about it
+ * @param  {Function|String} 	fn - Function to be inspected
+ * @return {String}        		Returns the function's name
+ */
+function getNameFromSourceCode(fn) {
+	let fnString = fn.constructor === String ? fn.replace(/(\r\n|\r|\n)/g, '') : fn.toString().replace(/(\r\n|\r|\n)/g, '');
+	fnString = fnString.replace(/function\(/g, '');
+	fnString = fnString.replace(/^const|let|var/, '');
+
+	let pattern = /([^ (]*)\(/;
+	let match = fnString.match(/([^ (]*)\(/);
+	if(!match){
+		match = fnString.match(/([^ (]*)\s?=/);
+	}
+	if(match){
+		return match[1].trim();
+	}
+}
+
+/**
+ * Inspects a function and returns information about it
+ * @param  {Function|String} fn - Function to be inspected
+ * @param  {String}   name - Name of the function to be used at the result set (it will supersed the one found during the inspection)
+ * @return {Object}        Returns and object with fn, name, parameters, parameters, signature
+ */
+function inspectFunction(fn, name) {
+	name = name || fn.name || getNameFromSourceCode(fn) || '';
+	const parametersStringified = stringifyParameters(fn);
+	const parameters = inspectParameters(parametersStringified);
+	const parametersNames = getParametersNamesFromInspection(parameters);
+	const signature =  `${name}(${parametersStringified});`;
+
+	return {
+		fn: fn.constructor === Function ? fn : undefined,
+		name,
+		signature,
+		parameters,
+		parametersNames
+	};
+}
+
+module.exports = inspectFunction;