Init fix.

src/core/lib/Zstd.mjs

@@ -22,7 +22,8 @@ let initPromise = null;
  */
 export function zstdInit() {
     if (!initPromise) {
-        initPromise = init();
+        const wasmUrl = `${self.docURL}/assets/zstd.wasm`;
+        initPromise = init(wasmUrl);
     }
     return initPromise;
 }

webpack.config.js

@@ -99,6 +99,10 @@ module.exports = {
                     context: "node_modules/node-forge/dist",
                     from: "prime.worker.min.js",
                     to: "assets/forge/"
+                }, {
+                    context: "node_modules/@bokuweb/zstd-wasm/dist/web/",
+                    from: "zstd.wasm",
+                    to: "assets/"
                 }
             ]
         }),
@@ -110,6 +114,17 @@ module.exports = {
                     operations: [
                         new ReplaceOperation("once", "if (pixelSize < elementMinSize)", "if (false)")
                     ]
+                },
+                {
+                    // @bokuweb/zstd-wasm's init() unconditionally evaluates
+                    // `new URL("./zstd.wasm", import.meta.url)` before checking
+                    // whether a path was passed in. Webpack's `publicPath: ""`
+                    // makes that base URL invalid and the constructor throws.
+                    // Neuter the offending line; we always pass a path from Zstd.mjs.
+                    test: /@bokuweb[\/\\]zstd-wasm[\/\\]dist[\/\\]web[\/\\]index\.web\.js$/,
+                    operations: [
+                        new ReplaceOperation("once", "new URL(`./zstd.wasm`, import.meta.url).href", "''")
+                    ]
                 }
             ]
         })