type t = Dom.mutationRecord;
let type_: t => string;let target: t => Dom.node;let addedNodes: t => Dom.nodeList;let removedNodes: t => Dom.nodeList;let previousSibling: t => option(Dom.node);let pnextSibling: t => option(Dom.node);let attributeName: t => string;let attributeNamespace: t => string;let oldValue: t => string;