getFunctionExpression.js
a00ef2159c6eissn4frontend

getFunctionExpression.js
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			/*
			MIT License http://www.opensource.org/licenses/mit-license.php
			Author Tobias Koppers @sokra
			*/

			"use strict";

			module.exports = expr => {
			// <FunctionExpression>
			if (
			expr.type === "FunctionExpression" \|\|
			expr.type === "ArrowFunctionExpression"
			) {
			return {
			fn: expr,
			expressions: [],
			needThis: false
			};
			}

			// <FunctionExpression>.bind(<Expression>)
			if (
			expr.type === "CallExpression" &&
			expr.callee.type === "MemberExpression" &&
			expr.callee.object.type === "FunctionExpression" &&
			expr.callee.property.type === "Identifier" &&
			expr.callee.property.name === "bind" &&
			expr.arguments.length === 1
			) {
			return {
			fn: expr.callee.object,
			expressions: [expr.arguments[0]],
			needThis: undefined
			};
			}
			// (function(_this) {return <FunctionExpression>})(this) (Coffeescript)
			if (
			expr.type === "CallExpression" &&
			expr.callee.type === "FunctionExpression" &&
			expr.callee.body.type === "BlockStatement" &&
			expr.arguments.length === 1 &&
			expr.arguments[0].type === "ThisExpression" &&
			expr.callee.body.body &&
			expr.callee.body.body.length === 1 &&
			expr.callee.body.body[0].type === "ReturnStatement" &&
			expr.callee.body.body[0].argument &&
			expr.callee.body.body[0].argument.type === "FunctionExpression"
			) {
			return {
			fn: expr.callee.body.body[0].argument,
			expressions: [],
			needThis: true
			};
			}
			};