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node_modules/@lezer/javascript/rollup.config.js

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+import {nodeResolve} from "@rollup/plugin-node-resolve"
+
+export default {
+  input: "./src/parser.js",
+  output: [{
+    format: "cjs",
+    file: "./dist/index.cjs"
+  }, {
+    format: "es",
+    file: "./dist/index.js"
+  }],
+  external(id) { return !/^[\.\/]/.test(id) },
+  plugins: [
+    nodeResolve()
+  ]
+}