run npm install to generate a package lock

node_modules/graphviz-wasm/dist/generate.js

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+/* IMPORT */
+import decode from 'decode-base64';
+import once from 'function-once';
+import wrapper from '../graphviz/wrapper.js';
+import { DEFAULT_ENGINE, DEFAULT_FORMAT } from './constants.js';
+/* MAIN */
+const generate = (GRAPHVIZ_BASE64) => {
+    const Graphviz = {
+        /* LIFECYCLE API */
+        loadWASM: once(async () => {
+            const GRAPHVIZ_BUFFER = decode(GRAPHVIZ_BASE64);
+            const instance = await wrapper({ wasmBinary: GRAPHVIZ_BUFFER });
+            Graphviz.layout = (source, format = DEFAULT_FORMAT, engine = DEFAULT_ENGINE) => {
+                const graphviz = new instance.Graphviz();
+                const result = graphviz.layout(source, format, engine);
+                instance.destroy(graphviz);
+                if (!result)
+                    throw new Error(instance.Graphviz.prototype.lastError());
+                return result;
+            };
+        }),
+        /* API */
+        layout: (source, format = DEFAULT_FORMAT, engine = DEFAULT_ENGINE) => {
+            throw new Error('[graphviz] You need to call and await "graphviz.loadWASM" first');
+        }
+    };
+    return Graphviz;
+};
+/* EXPORT */
+export default generate;