Error after npm update

[swinggraphics]

After installing, I run npm start and am prompted to run npm update. I do that, and then npm start again. This error is generated:

$ npm start
(node:28902) ExperimentalWarning: The fs.promises API is experimental

> extend-block-example@1.0.0 start
> parcel watch --no-hmr assets/js/extend-block-example.js -d dist

🚨  Git/extend-block-example-wp-plugin/assets/js/spacing-control.js: function __clone() {
    var node2 = new Node();
    for (var key in this) {
      // Do not clone comments tha...<omitted>... } could not be cloned.
    var node2 = new Node();
    for (var key in this) {
      // Do not clone comments tha...<omitted>... } could not be cloned.
    at Object.serialize (v8.js:202:7)
    at _default (Git/extend-block-example-wp-plugin/node_modules/@babel/core/lib/transformation/util/clone-deep.js:22:34)
    at normalizeFile (Git/extend-block-example-wp-plugin/node_modules/@babel/core/lib/transformation/normalize-file.js:84:36)
    at normalizeFile.next (<anonymous>)
    at run (Git/extend-block-example-wp-plugin/node_modules/@babel/core/lib/transformation/index.js:29:50)
    at run.next (<anonymous>)
    at Function.<anonymous> (Git/extend-block-example-wp-plugin/node_modules/@babel/core/lib/transform-ast.js:26:41)
    at Generator.next (<anonymous>)
    at evaluateSync (Git/extend-block-example-wp-plugin/node_modules/gensync/index.js:251:28)
    at Function.sync (Git/extend-block-example-wp-plugin/node_modules/gensync/index.js:89:14)