function isRequire(decl) {
			return (
				decl.init &&
				decl.init.type === "CallExpression" &&
				decl.init.callee.name === "require"
			);
		}
Check if a variable declaration is a require.
@param {ASTNode} decl variable declaration Node
@returns {bool} if decl is a require, return true; else return false.
@private