diff --git a/.gitignore b/.gitignore
index 2b2bbf9cb..fce6dacfc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ lib/
 node_modules/
 tsconfig.tsbuildinfo
 .pnpm-store/
+build/
 
 # GNU-style build system
 /configure
diff --git a/contrib/build-fast.sh b/contrib/build-fast.sh
new file mode 100755
index 000000000..ec0cd9c28
--- /dev/null
+++ b/contrib/build-fast.sh
@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+
+set -eu
+set -x
+
+export NODE_PATH=vendor:build/node_modules:build
+
+function build_idb() {
+  rm -rf packages/idb-bridge/node_modules
+  idb_dir=build/@gnu-taler/idb-bridge
+  mkdir -p $idb_dir
+  esbuild --platform=node --bundle packages/idb-bridge/src/index.ts > $idb_dir/index.js
+}
+
+function build_taler_util() {
+  taler_util_dir=build/@gnu-taler/taler-util
+  mkdir -p $taler_util_dir
+  esbuild --platform=node --bundle packages/taler-util/src/index.node.ts > $taler_util_dir/index.js
+}
+
+function build_fflate() {
+  fflate_dir=build/fflate
+  mkdir -p $fflate_dir
+  esbuild --platform=node --bundle vendor/fflate/src/index.ts > $fflate_dir/index.js
+}
+
+function build_ct() {
+  ct_dir=build/cancellationtoken
+  mkdir -p $ct_dir
+  esbuild --target=es6 --platform=node --bundle vendor/cancellationtoken/src/index.ts > $ct_dir/index.js
+}
+
+function build_wallet_core() {
+  taler_wallet_core_dir=build/@gnu-taler/taler-wallet-core
+
+  rm -rf packages/taler-wallet-core/node_modules
+  rm -rf packages/taler-wallet-core/lib
+  rm -rf packages/taler-wallet-core/dist
+
+  mkdir -p $taler_wallet_core_dir
+  esbuild --platform=node --bundle packages/taler-wallet-core/src/index.node.ts > $taler_wallet_core_dir/index.js
+}
+
+function build_wallet_embedded() {
+  taler_wallet_embedded_dir=build/@gnu-taler/taler-wallet-embedded
+
+  mkdir -p $taler_wallet_embedded_dir
+  esbuild --platform=node --bundle packages/taler-wallet-embedded/src/index.ts > $taler_wallet_embedded_dir/taler-wallet-embedded.js
+}
+
+function build_wallet_cli() {
+  taler_wallet_cli_dir=build/@gnu-taler/taler-wallet-cli
+  mkdir -p $taler_wallet_cli_dir
+
+  rm -rf packages/taler-wallet-cli/node_modules
+  rm -rf packages/taler-wallet-cli/lib
+  rm -rf packages/taler-wallet-cli/dist
+
+  esbuild --platform=node --bundle packages/taler-wallet-cli/src/index.ts > $taler_wallet_cli_dir/index.js
+  cp $taler_wallet_cli_dir/index.js $taler_wallet_cli_dir/taler-wallet-cli.js
+}
+
+
+build_idb
+build_taler_util
+build_fflate
+build_wallet_core
+build_wallet_embedded
+build_ct
+build_wallet_cli
diff --git a/packages/taler-wallet-embedded/src/index.ts b/packages/taler-wallet-embedded/src/index.ts
index 604375c73..e01281bc3 100644
--- a/packages/taler-wallet-embedded/src/index.ts
+++ b/packages/taler-wallet-embedded/src/index.ts
@@ -36,13 +36,13 @@ import {
 } from "@gnu-taler/taler-wallet-core";
 
 import fs from "fs";
-import { WalletNotification } from "../../taler-wallet-core/node_modules/@gnu-taler/taler-util/lib/notifications.js";
-import { TalerErrorCode } from "../../taler-wallet-core/node_modules/@gnu-taler/taler-util/lib/taler-error-codes.js";
 import {
   CoreApiEnvelope,
   CoreApiResponse,
   CoreApiResponseSuccess,
-} from "../../taler-wallet-core/node_modules/@gnu-taler/taler-util/lib/walletTypes.js";
+  WalletNotification,
+  TalerErrorCode,
+} from "@gnu-taler/taler-util";
 
 export { handleWorkerError, handleWorkerMessage };
 
diff --git a/vendor/README b/vendor/README
new file mode 100644
index 000000000..f2ae93736
--- /dev/null
+++ b/vendor/README
@@ -0,0 +1,6 @@
+The third-party packages in this directory are managed
+via git subtrees.
+
+They are added like this:
+
+$ git subtree -P vendor/jed add --squash https://github.com/messageformat/Jed master