diff --git a/packages/taler-config-lib/README.md b/packages/taler-config-lib/README.md
deleted file mode 100644
index b6464a55f..000000000
--- a/packages/taler-config-lib/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# @gnu-taler/taler-config-lib
-
-This package deploys Taler according to TypeScript instructions.
diff --git a/packages/taler-config-lib/package.json b/packages/taler-config-lib/package.json
deleted file mode 100644
index cbf10e5c9..000000000
--- a/packages/taler-config-lib/package.json
+++ /dev/null
@@ -1,40 +0,0 @@
-{
-  "name": "@gnu-taler/taler-config-lib",
-  "version": "0.9.0-dev.1",
-  "description": "GNU Taler Configuration engine.",
-  "module": "./lib/index.node.js",
-  "main": "./lib/index.node.js",
-  "type": "commonjs",
-  "types": "./lib/index.node.d.ts",
-  "typesVersions": {
-    "*": {
-      "lib/index.node.d.ts": [
-        "lib/index.node.d.ts"
-      ],
-      "src/*": [],
-      "*": []
-    }
-  },
-  "author": "MS",
-  "license": "AGPL-3.0-or-later",
-  "private": false,
-  "scripts": {
-    "prepare": "tsc",
-    "compile": "tsc",
-    "clean": "rimraf dist lib tsconfig.tsbuildinfo",
-    "pretty": "prettier --write src"
-  },
-  "devDependencies": {
-    "@types/node": "^18.8.5",
-    "ava": "^4.3.3",
-    "esbuild": "^0.14.21",
-    "prettier": "^2.5.1",
-    "rimraf": "^3.0.2",
-    "typescript": "^4.8.4"
-  },
-  "dependencies": {
-    "big-integer": "^1.6.51",
-    "jed": "^1.1.1",
-    "tslib": "^2.4.0"
-  }
-}
diff --git a/packages/taler-config-lib/src/index.node.ts b/packages/taler-config-lib/src/index.node.ts
deleted file mode 100644
index 366e365c2..000000000
--- a/packages/taler-config-lib/src/index.node.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-module.exports = function(subject: any) {
-    console.log("Hello, World!");
-};
diff --git a/packages/taler-config-lib/tsconfig.json b/packages/taler-config-lib/tsconfig.json
deleted file mode 100644
index 30cb65e1d..000000000
--- a/packages/taler-config-lib/tsconfig.json
+++ /dev/null
@@ -1,27 +0,0 @@
-{
-  "compileOnSave": true,
-  "compilerOptions": {
-    "composite": true,
-    "declaration": true,
-    "declarationMap": false,
-    "target": "ES6",
-    "module": "ESNext",
-    "moduleResolution": "node",
-    "sourceMap": true,
-    "lib": ["es6"],
-    "types": ["node"],
-    "noImplicitReturns": true,
-    "noFallthroughCasesInSwitch": true,
-    "strict": true,
-    "strictPropertyInitialization": false,
-    "outDir": "lib",
-    "noImplicitAny": true,
-    "noImplicitThis": true,
-    "incremental": true,
-    "esModuleInterop": true,
-    "importHelpers": true,
-    "rootDir": "./src",
-    "typeRoots": ["./node_modules/@types"]
-  },
-  "include": ["src/**/*"]
-}
diff --git a/packages/taler-util/src/clk.test.ts b/packages/taler-util/src/clk.test.ts
index bec93947b..9077f07de 100644
--- a/packages/taler-util/src/clk.test.ts
+++ b/packages/taler-util/src/clk.test.ts
@@ -20,13 +20,6 @@
 
 import test from "ava";
 import { clk } from "./clk.js";
-import {
-  Codec,
-  buildCodecForObject,
-  codecForConstString,
-  codecForString,
-  buildCodecForUnion,
-} from "./codec.js";
 
 test("bla", (t) => {
   const prog = clk.program("foo", {
diff --git a/packages/taler-wallet-cli/package.json b/packages/taler-wallet-cli/package.json
index 97c5a8e19..ac1ff4ef5 100644
--- a/packages/taler-wallet-cli/package.json
+++ b/packages/taler-wallet-cli/package.json
@@ -15,6 +15,7 @@
   "bin": {
     "taler-wallet-cli": "./bin/taler-wallet-cli"
   },
+  "type": "module",
   "scripts": {
     "prepare": "tsc && rollup -c",
     "compile": "tsc && rollup -c",
diff --git a/packages/taler-wallet-cli/rollup.config.js b/packages/taler-wallet-cli/rollup.config.js
index eba9fd54d..d9ca132b7 100644
--- a/packages/taler-wallet-cli/rollup.config.js
+++ b/packages/taler-wallet-cli/rollup.config.js
@@ -31,6 +31,7 @@ export default {
   plugins: [
     replace({
       __VERSION__: `"${printedVersion}"`,
+      preventAssignment: true,
     }),
 
     nodeResolve({
diff --git a/packages/taler-wallet-cli/src/harness/harness.ts b/packages/taler-wallet-cli/src/harness/harness.ts
index eac55281b..a5b519ec3 100644
--- a/packages/taler-wallet-cli/src/harness/harness.ts
+++ b/packages/taler-wallet-cli/src/harness/harness.ts
@@ -55,7 +55,7 @@ import {
   WalletCoreApiClient,
 } from "@gnu-taler/taler-wallet-core";
 import { deepStrictEqual } from "assert";
-import axios, { AxiosError } from "axios";
+import axiosImp, { AxiosError } from "axios";
 import { ChildProcess, spawn } from "child_process";
 import * as fs from "fs";
 import * as http from "http";
@@ -79,6 +79,8 @@ import {
 
 const exec = util.promisify(require("child_process").exec);
 
+const axios = axiosImp.default;
+
 export async function delayMs(ms: number): Promise<void> {
   return new Promise((resolve, reject) => {
     setTimeout(() => resolve(), ms);
diff --git a/packages/taler-wallet-cli/src/harness/libeufin-apis.ts b/packages/taler-wallet-cli/src/harness/libeufin-apis.ts
index 13d27c467..538d8e93f 100644
--- a/packages/taler-wallet-cli/src/harness/libeufin-apis.ts
+++ b/packages/taler-wallet-cli/src/harness/libeufin-apis.ts
@@ -1,4 +1,3 @@
-
 /**
  * This file defines most of the API calls offered
  * by Nexus and Sandbox.  They don't have state,
@@ -6,8 +5,8 @@
  * the services get actually started and managed.
  */
 
-
-import axios from "axios";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 import { URL } from "@gnu-taler/taler-util";
 
 export interface LibeufinSandboxServiceInterface {
@@ -80,7 +79,6 @@ export interface PostNexusPermissionRequest {
   };
 }
 
-
 export interface CreateAnastasisFacadeRequest {
   name: string;
   connectionName: string;
@@ -135,7 +133,6 @@ export interface SimulateIncomingTransactionRequest {
   amount: string;
 }
 
-
 export interface CreateEbicsBankAccountRequest {
   subscriber: {
     hostID: string;
@@ -171,7 +168,6 @@ function getRandomString(): string {
 }
 
 export namespace LibeufinSandboxApi {
-
   /**
    * Return balance and payto-address of 'accountLabel'.
    * Note: the demobank serving the request is hard-coded
@@ -182,14 +178,17 @@ export namespace LibeufinSandboxApi {
     username: string,
     password: string,
     libeufinSandboxService: LibeufinSandboxServiceInterface,
-    accountLabel: string
+    accountLabel: string,
   ) {
-    let url = new URL(`accounts/${accountLabel}`,libeufinSandboxService.baseUrl); 
+    let url = new URL(
+      `accounts/${accountLabel}`,
+      libeufinSandboxService.baseUrl,
+    );
     return await axios.get(url.href, {
       auth: {
         username: username,
-        password: password 
-      }
+        password: password,
+      },
     });
   }
 
@@ -199,10 +198,10 @@ export namespace LibeufinSandboxApi {
     password: string,
     libeufinSandboxService: LibeufinSandboxServiceInterface,
   ) {
-    let url = new URL("testing/register", libeufinSandboxService.baseUrl); 
+    let url = new URL("testing/register", libeufinSandboxService.baseUrl);
     await axios.post(url.href, {
       username: username,
-      password: password 
+      password: password,
     });
   }
 
@@ -215,17 +214,21 @@ export namespace LibeufinSandboxApi {
   ) {
     // baseUrl should already be pointed to one demobank.
     let url = new URL("ebics/subscribers", libeufinSandboxService.baseUrl);
-    await axios.post(url.href, {
-      userID: req.userID,
-      hostID: req.hostID,
-      partnerID: req.partnerID,
-      demobankAccountLabel: demobankAccountLabel,
-    }, {
-      auth: {
-        username: "admin",
-        password: "secret",
+    await axios.post(
+      url.href,
+      {
+        userID: req.userID,
+        hostID: req.hostID,
+        partnerID: req.partnerID,
+        demobankAccountLabel: demobankAccountLabel,
       },
-    });
+      {
+        auth: {
+          username: "admin",
+          password: "secret",
+        },
+      },
+    );
   }
 
   export async function rotateKeys(
@@ -234,12 +237,16 @@ export namespace LibeufinSandboxApi {
   ) {
     const baseUrl = libeufinSandboxService.baseUrl;
     let url = new URL(`admin/ebics/hosts/${hostID}/rotate-keys`, baseUrl);
-    await axios.post(url.href, {}, {
-      auth: {
-        username: "admin",
-        password: "secret",
+    await axios.post(
+      url.href,
+      {},
+      {
+        auth: {
+          username: "admin",
+          password: "secret",
+        },
       },
-    });
+    );
   }
   export async function createEbicsHost(
     libeufinSandboxService: LibeufinSandboxServiceInterface,
@@ -247,16 +254,19 @@ export namespace LibeufinSandboxApi {
   ) {
     const baseUrl = libeufinSandboxService.baseUrl;
     let url = new URL("admin/ebics/hosts", baseUrl);
-    await axios.post(url.href, {
-      hostID,
-      ebicsVersion: "2.5",
-    },
-    {
-      auth: {
-        username: "admin",
-        password: "secret",
+    await axios.post(
+      url.href,
+      {
+        hostID,
+        ebicsVersion: "2.5",
       },
-    });
+      {
+        auth: {
+          username: "admin",
+          password: "secret",
+        },
+      },
+    );
   }
 
   export async function createBankAccount(
@@ -347,16 +357,19 @@ export namespace LibeufinSandboxApi {
   ): Promise<any> {
     const baseUrl = libeufinSandboxService.baseUrl;
     let url = new URL("admin/payments/camt", baseUrl);
-    return await axios.post(url.href, {
-      bankaccount: accountLabel,
-      type: 53, 
-    },
-    {
-      auth: {
-        username: "admin",
-        password: "secret",
+    return await axios.post(
+      url.href,
+      {
+        bankaccount: accountLabel,
+        type: 53,
       },
-    });
+      {
+        auth: {
+          username: "admin",
+          password: "secret",
+        },
+      },
+    );
   }
 
   export async function getAccountInfoWithBalance(
@@ -364,10 +377,7 @@ export namespace LibeufinSandboxApi {
     accountLabel: string,
   ): Promise<any> {
     const baseUrl = libeufinSandboxService.baseUrl;
-    let url = new URL(
-      `admin/bank-accounts/${accountLabel}`,
-      baseUrl,
-    );
+    let url = new URL(`admin/bank-accounts/${accountLabel}`, baseUrl);
     return await axios.get(url.href, {
       auth: {
         username: "admin",
@@ -439,22 +449,15 @@ export namespace LibeufinNexusApi {
     accountName: string,
   ): Promise<any> {
     const baseUrl = libeufinNexusService.baseUrl;
-    let url = new URL(
-      `bank-accounts/${accountName}`,
-      baseUrl,
-    );
-    return await axios.get(
-      url.href,
-      {
-        auth: {
-          username: "admin",
-          password: "test",
-        },
+    let url = new URL(`bank-accounts/${accountName}`, baseUrl);
+    return await axios.get(url.href, {
+      auth: {
+        username: "admin",
+        password: "test",
       },
-    );
+    });
   }
 
-
   export async function submitInitiatedPayment(
     libeufinNexusService: LibeufinNexusServiceInterface,
     accountName: string,
@@ -582,7 +585,8 @@ export namespace LibeufinNexusApi {
     password: string = "test",
   ): Promise<any> {
     let url = new URL("history/incoming", anastasisBaseUrl);
-    let response = await axios.get(url.href, { params: params,
+    let response = await axios.get(url.href, {
+      params: params,
       auth: {
         username: username,
         password: password,
@@ -854,4 +858,3 @@ export namespace LibeufinNexusApi {
     );
   }
 }
-
diff --git a/packages/taler-wallet-cli/src/index.ts b/packages/taler-wallet-cli/src/index.ts
index 09ab414ac..6ae78bd47 100644
--- a/packages/taler-wallet-cli/src/index.ts
+++ b/packages/taler-wallet-cli/src/index.ts
@@ -59,7 +59,7 @@ import {
   WalletCoreApiClient,
   walletCoreDebugFlags,
 } from "@gnu-taler/taler-wallet-core";
-import type { TalerCryptoInterface } from "@gnu-taler/taler-wallet-core/src/crypto/cryptoImplementation";
+import type { TalerCryptoInterface } from "@gnu-taler/taler-wallet-core";
 import { TextDecoder, TextEncoder } from "util";
 import { runBench1 } from "./bench1.js";
 import { runBench2 } from "./bench2.js";
@@ -68,7 +68,6 @@ import { runEnv1 } from "./env1.js";
 import { GlobalTestState, runTestWithState } from "./harness/harness.js";
 import { getTestInfo, runTests } from "./integrationtests/testrunner.js";
 import { lintExchangeDeployment } from "./lint.js";
-import { checkLogicInvariant } from "@gnu-taler/taler-wallet-core/src/util/invariants.js";
 // @ts-ignore
 global.TextEncoder = TextEncoder;
 // @ts-ignore
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-bank-api.ts b/packages/taler-wallet-cli/src/integrationtests/test-bank-api.ts
index ab7ea1132..c7a23d3ce 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-bank-api.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-bank-api.ts
@@ -27,7 +27,7 @@ import {
   getPayto,
 } from "../harness/harness.js";
 import { createEddsaKeyPair, encodeCrock } from "@gnu-taler/taler-util";
-import { defaultCoinConfig } from "../harness/denomStructures";
+import { defaultCoinConfig } from "../harness/denomStructures.js";
 import {
   BankApi,
   BankAccessApi,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-exchange-timetravel.ts b/packages/taler-wallet-cli/src/integrationtests/test-exchange-timetravel.ts
index e2b81ee6a..074126e9f 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-exchange-timetravel.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-exchange-timetravel.ts
@@ -28,7 +28,7 @@ import {
   NodeHttpLib,
   readSuccessResponseJsonOrThrow,
 } from "@gnu-taler/taler-wallet-core";
-import { makeNoFeeCoinConfig } from "../harness/denomStructures";
+import { makeNoFeeCoinConfig } from "../harness/denomStructures.js";
 import {
   BankService,
   ExchangeService,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts
index cb57c7d0a..26fecd77e 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankaccount.ts
@@ -25,7 +25,7 @@ import {
   LibeufinSandboxService,
   LibeufinSandboxApi,
   findNexusPayment,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankconnection.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankconnection.ts
index f1d507c03..912b7b2ac 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankconnection.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-bankconnection.ts
@@ -18,14 +18,7 @@
  * Imports.
  */
 import { GlobalTestState } from "../harness/harness.js";
-import {
-  NexusUserBundle,
-  LibeufinNexusApi,
-  LibeufinNexusService,
-  LibeufinSandboxService,
-  LibeufinSandboxApi,
-  findNexusPayment,
-} from "../harness/libeufin";
+import { LibeufinNexusApi, LibeufinNexusService } from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade-bad-request.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade-bad-request.ts
index b106cf304..a1da9e0da 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade-bad-request.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade-bad-request.ts
@@ -17,18 +17,18 @@
 /**
  * Imports.
  */
-import axios from "axios";
 import { URL } from "@gnu-taler/taler-util";
+import axiosImp from "axios";
 import { GlobalTestState } from "../harness/harness.js";
 import {
-  SandboxUserBundle,
-  NexusUserBundle,
   launchLibeufinServices,
-  LibeufinNexusApi,
-} from "../harness/libeufin";
+  NexusUserBundle,
+  SandboxUserBundle,
+} from "../harness/libeufin.js";
+
+const axios = axiosImp.default;
 
 export async function runLibeufinApiFacadeBadRequestTest(t: GlobalTestState) {
-
   /**
    * User saltetd "01"
    */
@@ -37,7 +37,7 @@ export async function runLibeufinApiFacadeBadRequestTest(t: GlobalTestState) {
     "http://localhost:5010/ebicsweb",
   );
   const user01sandbox = new SandboxUserBundle("01");
-  
+
   /**
    * Launch Sandbox and Nexus.
    */
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade.ts
index c49d49712..946c565d4 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-facade.ts
@@ -23,7 +23,7 @@ import {
   NexusUserBundle,
   launchLibeufinServices,
   LibeufinNexusApi,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-permissions.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-permissions.ts
index e64f459a0..f8f2d7d80 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-permissions.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-permissions.ts
@@ -22,7 +22,7 @@ import {
   NexusUserBundle,
   LibeufinNexusApi,
   LibeufinNexusService,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-camt.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-camt.ts
index 3e0acb62d..250d17d3d 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-camt.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-camt.ts
@@ -19,19 +19,14 @@
  */
 import { GlobalTestState } from "../harness/harness.js";
 import {
-  NexusUserBundle,
-  LibeufinNexusApi,
-  LibeufinNexusService,
-  LibeufinSandboxService,
   LibeufinSandboxApi,
-  findNexusPayment,
-} from "../harness/libeufin";
+  LibeufinSandboxService,
+} from "../harness/libeufin.js";
 
 // This test only checks that LibEuFin doesn't fail when
 // it generates Camt statements - no assertions take place.
 // Furthermore, it prints the Camt.053 being generated.
 export async function runLibeufinApiSandboxCamtTest(t: GlobalTestState) {
-
   const sandbox = await LibeufinSandboxService.create(t, {
     httpPort: 5012,
     databaseJdbcUri: `jdbc:sqlite:${t.testDir}/libeufin-sandbox.sqlite3`,
@@ -50,10 +45,30 @@ export async function runLibeufinApiSandboxCamtTest(t: GlobalTestState) {
     name: "Mock Name",
     label: "mock-account-1",
   });
-  await sandbox.makeTransaction("mock-account-0", "mock-account-1", "EUR:1", "+1");
-  await sandbox.makeTransaction("mock-account-0", "mock-account-1", "EUR:1", "+1");
-  await sandbox.makeTransaction("mock-account-0", "mock-account-1", "EUR:1", "+1");
-  await sandbox.makeTransaction("mock-account-1", "mock-account-0", "EUR:5", "minus 5");
+  await sandbox.makeTransaction(
+    "mock-account-0",
+    "mock-account-1",
+    "EUR:1",
+    "+1",
+  );
+  await sandbox.makeTransaction(
+    "mock-account-0",
+    "mock-account-1",
+    "EUR:1",
+    "+1",
+  );
+  await sandbox.makeTransaction(
+    "mock-account-0",
+    "mock-account-1",
+    "EUR:1",
+    "+1",
+  );
+  await sandbox.makeTransaction(
+    "mock-account-1",
+    "mock-account-0",
+    "EUR:5",
+    "minus 5",
+  );
   await sandbox.c53tick();
   let ret = await LibeufinSandboxApi.getCamt053(sandbox, "mock-account-1");
   console.log(ret);
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts
index 859d26f00..224c45970 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-sandbox-transactions.ts
@@ -19,16 +19,13 @@
  */
 import { GlobalTestState } from "../harness/harness.js";
 import {
-  NexusUserBundle,
-  LibeufinNexusApi,
-  LibeufinNexusService,
-  LibeufinSandboxService,
   LibeufinSandboxApi,
-  findNexusPayment,
-} from "../harness/libeufin";
-
-export async function runLibeufinApiSandboxTransactionsTest(t: GlobalTestState) {
+  LibeufinSandboxService,
+} from "../harness/libeufin.js";
 
+export async function runLibeufinApiSandboxTransactionsTest(
+  t: GlobalTestState,
+) {
   const sandbox = await LibeufinSandboxService.create(t, {
     httpPort: 5012,
     databaseJdbcUri: `jdbc:sqlite:${t.testDir}/libeufin-sandbox.sqlite3`,
@@ -42,30 +39,31 @@ export async function runLibeufinApiSandboxTransactionsTest(t: GlobalTestState)
     label: "mock-account",
   });
   await LibeufinSandboxApi.simulateIncomingTransaction(
-    sandbox, 
+    sandbox,
     "mock-account",
     {
-    
       debtorIban: "DE84500105176881385584",
       debtorBic: "BELADEBEXXX",
       debtorName: "mock2",
       subject: "mock subject",
-      amount: "1" // EUR is default.
-    }
-  )
+      amount: "1", // EUR is default.
+    },
+  );
   await LibeufinSandboxApi.simulateIncomingTransaction(
-    sandbox, 
+    sandbox,
     "mock-account",
     {
-    
       debtorIban: "DE84500105176881385584",
       debtorBic: "BELADEBEXXX",
       debtorName: "mock2",
       subject: "mock subject 2",
-      amount: "1.1" // EUR is default.
-    }
-  )
-  let ret = await LibeufinSandboxApi.getAccountInfoWithBalance(sandbox, "mock-account");
+      amount: "1.1", // EUR is default.
+    },
+  );
+  let ret = await LibeufinSandboxApi.getAccountInfoWithBalance(
+    sandbox,
+    "mock-account",
+  );
   t.assertAmountEquals(ret.data.balance, "EUR:2.1");
 }
 runLibeufinApiSandboxTransactionsTest.suites = ["libeufin"];
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-scheduling.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-scheduling.ts
index 3863c5711..95f4bfaa0 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-scheduling.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-scheduling.ts
@@ -17,15 +17,14 @@
 /**
  * Imports.
  */
-import { GlobalTestState, setupDb } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
-  SandboxUserBundle,
-  NexusUserBundle,
   launchLibeufinServices,
-  LibeufinSandboxApi,
   LibeufinNexusApi,
   LibeufinNexusService,
-} from "../harness/libeufin";
+  NexusUserBundle,
+  SandboxUserBundle,
+} from "../harness/libeufin.js";
 
 /**
  * Test Nexus scheduling API.  It creates a task, check whether it shows
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-users.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-users.ts
index edf66690b..bc3103c7e 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-users.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-api-users.ts
@@ -18,7 +18,7 @@
  * Imports.
  */
 import { GlobalTestState } from "../harness/harness.js";
-import { LibeufinNexusApi, LibeufinNexusService } from "../harness/libeufin";
+import { LibeufinNexusApi, LibeufinNexusService } from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-bad-gateway.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-bad-gateway.ts
index 786e61832..53aacca84 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-bad-gateway.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-bad-gateway.ts
@@ -23,7 +23,7 @@ import {
   LibeufinNexusApi,
   LibeufinNexusService,
   LibeufinSandboxService,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Testing how Nexus reacts when the Sandbox is unreachable.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-basic.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-basic.ts
index 83231b358..300967c7a 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-basic.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-basic.ts
@@ -22,7 +22,7 @@ import {
   WalletApiOperation,
   HarnessExchangeBankAccount,
 } from "@gnu-taler/taler-wallet-core";
-import { CoinConfig, defaultCoinConfig } from "../harness/denomStructures";
+import { CoinConfig, defaultCoinConfig } from "../harness/denomStructures.js";
 import {
   DbInfo,
   ExchangeService,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-c5x.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-c5x.ts
index 5a995fb69..cc46c6d33 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-c5x.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-c5x.ts
@@ -17,14 +17,13 @@
 /**
  * Imports.
  */
-import { GlobalTestState, delayMs } from "../harness/harness.js";
+import { GlobalTestState } from "../harness/harness.js";
 import {
-  SandboxUserBundle,
-  NexusUserBundle,
   launchLibeufinServices,
-  LibeufinSandboxApi,
   LibeufinNexusApi,
-} from "../harness/libeufin";
+  NexusUserBundle,
+  SandboxUserBundle,
+} from "../harness/libeufin.js";
 
 /**
  * This test checks how the C52 and C53 coordinate.  It'll test
@@ -81,7 +80,7 @@ export async function runLibeufinC5xTest(t: GlobalTestState) {
     user01nexus.localAccountName,
   );
   t.assertTrue(nexusTxs.data["transactions"].length == 0);
-  
+
   // Addressing one payment to user 01
   await libeufinServices.libeufinSandbox.makeTransaction(
     user02sandbox.ebicsBankAccount.label, // debit
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-facade-anastasis.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-facade-anastasis.ts
index 0bbd4fd28..1ed258c3a 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-facade-anastasis.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-facade-anastasis.ts
@@ -24,7 +24,7 @@ import {
   launchLibeufinServices,
   LibeufinNexusApi,
   LibeufinSandboxApi,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Testing the Anastasis API, offered by the Anastasis facade.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-keyrotation.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-keyrotation.ts
index 5dc31f0bf..21bf07de2 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-keyrotation.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-keyrotation.ts
@@ -24,7 +24,7 @@ import {
   launchLibeufinServices,
   LibeufinSandboxApi,
   LibeufinNexusApi,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-nexus-balance.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-nexus-balance.ts
index 1402d9ae5..a52de8d96 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-nexus-balance.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-nexus-balance.ts
@@ -23,7 +23,7 @@ import {
   NexusUserBundle,
   launchLibeufinServices,
   LibeufinNexusApi,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * This test checks how the C52 and C53 coordinate.  It'll test
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund-multiple-users.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund-multiple-users.ts
index 39517f247..245f34331 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund-multiple-users.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund-multiple-users.ts
@@ -24,7 +24,7 @@ import {
   launchLibeufinServices,
   LibeufinSandboxApi,
   LibeufinNexusApi,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * User 01 expects a refund from user 02, and expectedly user 03
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts
index d91ae88bb..9d90121a0 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-refund.ts
@@ -24,7 +24,7 @@ import {
   launchLibeufinServices,
   LibeufinSandboxApi,
   LibeufinNexusApi,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-sandbox-wire-transfer-cli.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-sandbox-wire-transfer-cli.ts
index d784885fd..7f274f554 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-sandbox-wire-transfer-cli.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-sandbox-wire-transfer-cli.ts
@@ -19,16 +19,13 @@
  */
 import { GlobalTestState } from "../harness/harness.js";
 import {
-  NexusUserBundle,
-  LibeufinNexusApi,
-  LibeufinNexusService,
-  LibeufinSandboxService,
   LibeufinSandboxApi,
-  findNexusPayment,
-} from "../harness/libeufin";
-
-export async function runLibeufinSandboxWireTransferCliTest(t: GlobalTestState) {
+  LibeufinSandboxService,
+} from "../harness/libeufin.js";
 
+export async function runLibeufinSandboxWireTransferCliTest(
+  t: GlobalTestState,
+) {
   const sandbox = await LibeufinSandboxService.create(t, {
     httpPort: 5012,
     databaseJdbcUri: `jdbc:sqlite:${t.testDir}/libeufin-sandbox.sqlite3`,
@@ -49,22 +46,40 @@ export async function runLibeufinSandboxWireTransferCliTest(t: GlobalTestState)
     label: "mock-account-2",
   });
   await sandbox.makeTransaction(
-    "mock-account", "mock-account-2", "EUR:1", "one!"
+    "mock-account",
+    "mock-account-2",
+    "EUR:1",
+    "one!",
   );
   await sandbox.makeTransaction(
-    "mock-account", "mock-account-2", "EUR:1", "two!"
+    "mock-account",
+    "mock-account-2",
+    "EUR:1",
+    "two!",
   );
   await sandbox.makeTransaction(
-    "mock-account", "mock-account-2", "EUR:1", "three!"
+    "mock-account",
+    "mock-account-2",
+    "EUR:1",
+    "three!",
   );
   await sandbox.makeTransaction(
-    "mock-account-2", "mock-account", "EUR:1", "Give one back."
+    "mock-account-2",
+    "mock-account",
+    "EUR:1",
+    "Give one back.",
   );
   await sandbox.makeTransaction(
-    "mock-account-2", "mock-account", "EUR:0.11", "Give fraction back."
+    "mock-account-2",
+    "mock-account",
+    "EUR:0.11",
+    "Give fraction back.",
   );
-  let ret = await LibeufinSandboxApi.getAccountInfoWithBalance(sandbox, "mock-account-2");
-  console.log(ret.data.balance)
-  t.assertTrue(ret.data.balance == "EUR:1.89")
+  let ret = await LibeufinSandboxApi.getAccountInfoWithBalance(
+    sandbox,
+    "mock-account-2",
+  );
+  console.log(ret.data.balance);
+  t.assertTrue(ret.data.balance == "EUR:1.89");
 }
 runLibeufinSandboxWireTransferCliTest.suites = ["libeufin"];
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-tutorial.ts b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-tutorial.ts
index 71a1e8c4b..0701fd1c5 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-libeufin-tutorial.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-libeufin-tutorial.ts
@@ -22,7 +22,7 @@ import {
   LibeufinNexusService,
   LibeufinSandboxService,
   LibeufinCli,
-} from "../harness/libeufin";
+} from "../harness/libeufin.js";
 
 /**
  * Run basic test with LibEuFin.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-merchant-exchange-confusion.ts b/packages/taler-wallet-cli/src/integrationtests/test-merchant-exchange-confusion.ts
index 1e958fd73..30ab1cd4b 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-merchant-exchange-confusion.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-merchant-exchange-confusion.ts
@@ -17,35 +17,34 @@
 /**
  * Imports.
  */
+import {
+  codecForMerchantOrderStatusUnpaid,
+  ConfirmPayResultType,
+  PreparePayResultType,
+} from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import axiosImp from "axios";
+const axios = axiosImp.default;
+import { URL } from "url";
+import { defaultCoinConfig } from "../harness/denomStructures.js";
+import {
+  FaultInjectedExchangeService,
+  FaultInjectedMerchantService,
+} from "../harness/faultInjection.js";
 import {
   BankService,
   ExchangeService,
+  getPayto,
   GlobalTestState,
   MerchantPrivateApi,
   MerchantService,
   setupDb,
   WalletCli,
-  getPayto
 } from "../harness/harness.js";
 import {
-  withdrawViaBank,
-  createFaultInjectedMerchantTestkudosEnvironment,
   FaultyMerchantTestEnvironment,
+  withdrawViaBank,
 } from "../harness/helpers.js";
-import {
-  PreparePayResultType,
-  codecForMerchantOrderStatusUnpaid,
-  ConfirmPayResultType,
-} from "@gnu-taler/taler-util";
-import axios from "axios";
-import {
-  FaultInjectedExchangeService,
-  FaultInjectedMerchantService,
-  FaultInjectionRequestContext,
-} from "../harness/faultInjection";
-import { defaultCoinConfig } from "../harness/denomStructures";
-import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { URL } from "url";
 
 /**
  * Run a test case with a simple TESTKUDOS Taler environment, consisting
@@ -115,7 +114,7 @@ export async function createConfusedMerchantTestkudosEnvironment(
   await merchant.addInstance({
     id: "minst1",
     name: "minst1",
-    paytoUris: [getPayto("minst1")]
+    paytoUris: [getPayto("minst1")],
   });
 
   console.log("setup done!");
@@ -141,12 +140,8 @@ export async function createConfusedMerchantTestkudosEnvironment(
 export async function runMerchantExchangeConfusionTest(t: GlobalTestState) {
   // Set up test environment
 
-  const {
-    wallet,
-    bank,
-    faultyExchange,
-    faultyMerchant,
-  } = await createConfusedMerchantTestkudosEnvironment(t);
+  const { wallet, bank, faultyExchange, faultyMerchant } =
+    await createConfusedMerchantTestkudosEnvironment(t);
 
   // Withdraw digital cash into the wallet.
 
@@ -214,7 +209,10 @@ export async function runMerchantExchangeConfusionTest(t: GlobalTestState) {
   const proposalId = preparePayResp.proposalId;
 
   const orderUrlWithHash = new URL(publicOrderStatusUrl);
-  orderUrlWithHash.searchParams.set("h_contract", preparePayResp.contractTermsHash);
+  orderUrlWithHash.searchParams.set(
+    "h_contract",
+    preparePayResp.contractTermsHash,
+  );
 
   console.log("requesting", orderUrlWithHash.href);
 
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-delete.ts b/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-delete.ts
index 2bef87b20..09231cdd8 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-delete.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-delete.ts
@@ -18,7 +18,8 @@
  * Imports.
  */
 import { URL } from "@gnu-taler/taler-util";
-import axios from "axios";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 import {
   ExchangeService,
   GlobalTestState,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-urls.ts b/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-urls.ts
index f72189014..a4e44c7f3 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-urls.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances-urls.ts
@@ -18,7 +18,8 @@
  * Imports.
  */
 import { Duration } from "@gnu-taler/taler-util";
-import axios from "axios";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 import {
   ExchangeService,
   GlobalTestState,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances.ts b/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances.ts
index 1bf6be4cd..3efe83241 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-merchant-instances.ts
@@ -18,7 +18,8 @@
  * Imports.
  */
 import { URL } from "@gnu-taler/taler-util";
-import axios from "axios";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 import {
   ExchangeService,
   GlobalTestState,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-merchant-longpolling.ts b/packages/taler-wallet-cli/src/integrationtests/test-merchant-longpolling.ts
index 556d9074e..4b9f53f05 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-merchant-longpolling.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-merchant-longpolling.ts
@@ -25,7 +25,8 @@ import {
   ConfirmPayResultType,
   URL,
 } from "@gnu-taler/taler-util";
-import axios from "axios";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 
 /**
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-merchant-refund-api.ts b/packages/taler-wallet-cli/src/integrationtests/test-merchant-refund-api.ts
index 539904f1c..5d9b23fa7 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-merchant-refund-api.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-merchant-refund-api.ts
@@ -34,7 +34,8 @@ import {
   PreparePayResultType,
   Duration,
 } from "@gnu-taler/taler-util";
-import axios from "axios";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 import {
   WalletApiOperation,
   BankServiceHandle,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-pay-paid.ts b/packages/taler-wallet-cli/src/integrationtests/test-pay-paid.ts
index 2d291ddd3..2ef91e4a8 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-pay-paid.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-pay-paid.ts
@@ -28,8 +28,9 @@ import {
   ConfirmPayResultType,
   URL,
 } from "@gnu-taler/taler-util";
-import axios from "axios";
-import { FaultInjectionRequestContext } from "../harness/faultInjection";
+import axiosImp from "axios";
+const axios = axiosImp.default;
+import { FaultInjectionRequestContext } from "../harness/faultInjection.js";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 
 /**
@@ -43,12 +44,8 @@ import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 export async function runPayPaidTest(t: GlobalTestState) {
   // Set up test environment
 
-  const {
-    wallet,
-    bank,
-    faultyExchange,
-    faultyMerchant,
-  } = await createFaultInjectedMerchantTestkudosEnvironment(t);
+  const { wallet, bank, faultyExchange, faultyMerchant } =
+    await createFaultInjectedMerchantTestkudosEnvironment(t);
 
   // Withdraw digital cash into the wallet.
 
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-payment-fault.ts b/packages/taler-wallet-cli/src/integrationtests/test-payment-fault.ts
index c78f030c8..dea538e35 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-payment-fault.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-payment-fault.ts
@@ -35,9 +35,9 @@ import {
   FaultInjectedExchangeService,
   FaultInjectionRequestContext,
   FaultInjectionResponseContext,
-} from "../harness/faultInjection";
+} from "../harness/faultInjection.js";
 import { CoreApiResponse } from "@gnu-taler/taler-util";
-import { defaultCoinConfig } from "../harness/denomStructures";
+import { defaultCoinConfig } from "../harness/denomStructures.js";
 import {
   WalletApiOperation,
   BankApi,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-payment-multiple.ts b/packages/taler-wallet-cli/src/integrationtests/test-payment-multiple.ts
index 3084ecfe0..46325c05f 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-payment-multiple.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-payment-multiple.ts
@@ -28,7 +28,7 @@ import {
   getPayto
 } from "../harness/harness.js";
 import { withdrawViaBank } from "../harness/helpers.js";
-import { coin_ct10, coin_u1 } from "../harness/denomStructures";
+import { coin_ct10, coin_u1 } from "../harness/denomStructures.js";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 
 async function setupTest(
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-payment-transient.ts b/packages/taler-wallet-cli/src/integrationtests/test-payment-transient.ts
index 7e178077e..b57b355c6 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-payment-transient.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-payment-transient.ts
@@ -22,11 +22,9 @@ import {
   withdrawViaBank,
   createFaultInjectedMerchantTestkudosEnvironment,
 } from "../harness/helpers.js";
-import axios from "axios";
 import {
-  FaultInjectionRequestContext,
   FaultInjectionResponseContext,
-} from "../harness/faultInjection";
+} from "../harness/faultInjection.js";
 import {
   codecForMerchantOrderStatusUnpaid,
   ConfirmPayResultType,
@@ -36,6 +34,8 @@ import {
   URL,
 } from "@gnu-taler/taler-util";
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 
 /**
  * Run test for a payment where the merchant has a transient
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-paywall-flow.ts b/packages/taler-wallet-cli/src/integrationtests/test-paywall-flow.ts
index a8e3b3e95..a9601c625 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-paywall-flow.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-paywall-flow.ts
@@ -18,14 +18,18 @@
  * Imports.
  */
 import { GlobalTestState, MerchantPrivateApi } from "../harness/harness.js";
-import { createSimpleTestkudosEnvironment, withdrawViaBank } from "../harness/helpers.js";
+import {
+  createSimpleTestkudosEnvironment,
+  withdrawViaBank,
+} from "../harness/helpers.js";
 import {
   PreparePayResultType,
   codecForMerchantOrderStatusUnpaid,
   ConfirmPayResultType,
   URL,
 } from "@gnu-taler/taler-util";
-import axios from "axios";
+import axiosImp from "axios";
+const axios = axiosImp.default;
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 
 /**
@@ -34,12 +38,8 @@ import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
 export async function runPaywallFlowTest(t: GlobalTestState) {
   // Set up test environment
 
-  const {
-    wallet,
-    bank,
-    exchange,
-    merchant,
-  } = await createSimpleTestkudosEnvironment(t);
+  const { wallet, bank, exchange, merchant } =
+    await createSimpleTestkudosEnvironment(t);
 
   // Withdraw digital cash into the wallet.
 
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-revocation.ts b/packages/taler-wallet-cli/src/integrationtests/test-revocation.ts
index bf35b5382..3ed071a18 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-revocation.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-revocation.ts
@@ -18,7 +18,7 @@
  * Imports.
  */
 import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
-import { CoinConfig } from "../harness/denomStructures";
+import { CoinConfig } from "../harness/denomStructures.js";
 import {
   GlobalTestState,
   ExchangeService,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-timetravel-autorefresh.ts b/packages/taler-wallet-cli/src/integrationtests/test-timetravel-autorefresh.ts
index b55be9f82..54b66e0b2 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-timetravel-autorefresh.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-timetravel-autorefresh.ts
@@ -27,7 +27,7 @@ import {
   PendingOperationsResponse,
   WalletApiOperation,
 } from "@gnu-taler/taler-wallet-core";
-import { makeNoFeeCoinConfig } from "../harness/denomStructures";
+import { makeNoFeeCoinConfig } from "../harness/denomStructures.js";
 import {
   BankService,
   ExchangeService,
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-basic.ts b/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-basic.ts
index af294da8e..fc2f3335d 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-basic.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-basic.ts
@@ -24,7 +24,7 @@ import {
   createSimpleTestkudosEnvironment,
   withdrawViaBank,
 } from "../harness/helpers.js";
-import { SyncService } from "../harness/sync";
+import { SyncService } from "../harness/sync.js";
 
 /**
  * Run test for basic, bank-integrated withdrawal.
diff --git a/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-doublespend.ts b/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-doublespend.ts
index 228712da5..8b52260e9 100644
--- a/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-doublespend.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/test-wallet-backup-doublespend.ts
@@ -29,7 +29,7 @@ import {
   makeTestPayment,
   withdrawViaBank,
 } from "../harness/helpers.js";
-import { SyncService } from "../harness/sync";
+import { SyncService } from "../harness/sync.js";
 
 export async function runWalletBackupDoublespendTest(t: GlobalTestState) {
   // Set up test environment
diff --git a/packages/taler-wallet-cli/src/integrationtests/testrunner.ts b/packages/taler-wallet-cli/src/integrationtests/testrunner.ts
index c22689e46..e4a2193bb 100644
--- a/packages/taler-wallet-cli/src/integrationtests/testrunner.ts
+++ b/packages/taler-wallet-cli/src/integrationtests/testrunner.ts
@@ -56,7 +56,7 @@ import { runLibeufinSandboxWireTransferCliTest } from "./test-libeufin-sandbox-w
 import { runLibeufinTutorialTest } from "./test-libeufin-tutorial.js";
 import { runMerchantExchangeConfusionTest } from "./test-merchant-exchange-confusion.js";
 import { runMerchantInstancesTest } from "./test-merchant-instances.js";
-import { runMerchantInstancesDeleteTest } from "./test-merchant-instances-delete";
+import { runMerchantInstancesDeleteTest } from "./test-merchant-instances-delete.js";
 import { runMerchantInstancesUrlsTest } from "./test-merchant-instances-urls.js";
 import { runMerchantLongpollingTest } from "./test-merchant-longpolling.js";
 import { runMerchantRefundApiTest } from "./test-merchant-refund-api.js";
diff --git a/packages/taler-wallet-cli/tsconfig.json b/packages/taler-wallet-cli/tsconfig.json
index 945161176..447d3f946 100644
--- a/packages/taler-wallet-cli/tsconfig.json
+++ b/packages/taler-wallet-cli/tsconfig.json
@@ -4,7 +4,7 @@
     "composite": true,
     "target": "ES2018",
     "module": "ESNext",
-    "moduleResolution": "node",
+    "moduleResolution": "Node16",
     "sourceMap": true,
     "lib": ["es6"],
     "noImplicitReturns": true,
diff --git a/packages/taler-wallet-core/package.json b/packages/taler-wallet-core/package.json
index 9b007a93d..57b89666a 100644
--- a/packages/taler-wallet-core/package.json
+++ b/packages/taler-wallet-core/package.json
@@ -12,8 +12,8 @@
   "author": "Florian Dold",
   "license": "GPL-3.0",
   "scripts": {
-    "prepare": "tsc && rollup -c",
-    "compile": "tsc && rollup -c",
+    "prepare": "tsc",
+    "compile": "tsc",
     "pretty": "prettier --write src",
     "test": "tsc && ava",
     "coverage": "tsc && c8 --src src --all ava",
@@ -29,14 +29,15 @@
     "src/",
     "lib/"
   ],
-  "main": "./dist/taler-wallet-core.js",
-  "browser": {
-    "./dist/taler-wallet-core.js": "./dist/taler-wallet-core.browser.js",
-    "./lib/index.node.js": "./lib/index.browser.js"
-  },
-  "module": "./lib/index.node.js",
   "type": "module",
   "types": "./lib/index.node.d.ts",
+  "exports": {
+    ".": {
+      "browser": "./lib/index.browser.js",
+      "node": "./lib/index.node.js",
+      "default": "./lib/index.js"
+    }
+  },
   "devDependencies": {
     "@ava/typescript": "^3.0.1",
     "@gnu-taler/pogen": "workspace:*",
@@ -54,8 +55,6 @@
     "po2json": "^0.4.5",
     "prettier": "^2.5.1",
     "rimraf": "^3.0.2",
-    "rollup": "^2.79.0",
-    "rollup-plugin-sourcemaps": "^0.6.3",
     "source-map-resolve": "^0.6.0",
     "typedoc": "^0.23.16",
     "typescript": "^4.8.4"
diff --git a/packages/taler-wallet-core/src/headless/NodeHttpLib.ts b/packages/taler-wallet-core/src/headless/NodeHttpLib.ts
index 5290bd441..c1d42796d 100644
--- a/packages/taler-wallet-core/src/headless/NodeHttpLib.ts
+++ b/packages/taler-wallet-core/src/headless/NodeHttpLib.ts
@@ -27,7 +27,7 @@ import {
   HttpResponse,
 } from "../util/http.js";
 import { RequestThrottler } from "@gnu-taler/taler-util";
-import Axios, { AxiosResponse } from "axios";
+import axios, { AxiosResponse } from "axios";
 import { TalerError } from "../errors.js";
 import { Logger, bytesToString } from "@gnu-taler/taler-util";
 import { TalerErrorCode, URL } from "@gnu-taler/taler-util";
@@ -75,7 +75,7 @@ export class NodeHttpLib implements HttpRequestLibrary {
     // FIXME: Use AbortController / etc. to handle cancellation
     let resp: AxiosResponse;
     try {
-      let respPromise = Axios({
+      let respPromise = axios.default({
         method,
         url: url,
         responseType: "arraybuffer",
diff --git a/packages/taler-wallet-core/src/headless/helpers.ts b/packages/taler-wallet-core/src/headless/helpers.ts
index 2be9be9a1..df4474271 100644
--- a/packages/taler-wallet-core/src/headless/helpers.ts
+++ b/packages/taler-wallet-core/src/headless/helpers.ts
@@ -29,7 +29,7 @@ import {
   MemoryBackend,
   shimIndexedDB,
 } from "@gnu-taler/idb-bridge";
-import { AccessStats } from "@gnu-taler/idb-bridge/src/MemoryBackend";
+import { AccessStats } from "@gnu-taler/idb-bridge";
 import { Logger, WalletNotification } from "@gnu-taler/taler-util";
 import * as fs from "fs";
 import { NodeThreadCryptoWorkerFactory } from "../crypto/workers/nodeThreadWorker.js";
diff --git a/packages/taler-wallet-core/src/index.ts b/packages/taler-wallet-core/src/index.ts
index 0e01e3517..afd86b45d 100644
--- a/packages/taler-wallet-core/src/index.ts
+++ b/packages/taler-wallet-core/src/index.ts
@@ -61,6 +61,7 @@ export {
   nativeCryptoR,
   nativeCrypto,
   nullCrypto,
+  TalerCryptoInterface,
 } from "./crypto/cryptoImplementation.js";
 
 export * from "./util/timer.js";
diff --git a/packages/taler-wallet-core/tsconfig.json b/packages/taler-wallet-core/tsconfig.json
index c3366373e..5b74121a2 100644
--- a/packages/taler-wallet-core/tsconfig.json
+++ b/packages/taler-wallet-core/tsconfig.json
@@ -6,7 +6,7 @@
     "declarationMap": false,
     "target": "ES2017",
     "module": "ESNext",
-    "moduleResolution": "node",
+    "moduleResolution": "Node16",
     "sourceMap": true,
     "lib": ["es6"],
     "types": ["node"],
diff --git a/packages/taler-wallet-embedded/package.json b/packages/taler-wallet-embedded/package.json
index 1dd89f984..25cd8f2cc 100644
--- a/packages/taler-wallet-embedded/package.json
+++ b/packages/taler-wallet-embedded/package.json
@@ -12,6 +12,7 @@
   "main": "dist/taler-wallet-embedded.js",
   "author": "Florian Dold",
   "license": "GPL-3.0",
+  "type": "module",
   "scripts": {
     "compile": "tsc && rollup -c",
     "pretty": "prettier --write src",
diff --git a/packages/taler-wallet-embedded/tsconfig.json b/packages/taler-wallet-embedded/tsconfig.json
index fa759bdaa..7b27ca6b7 100644
--- a/packages/taler-wallet-embedded/tsconfig.json
+++ b/packages/taler-wallet-embedded/tsconfig.json
@@ -6,7 +6,7 @@
     "declarationMap": true,
     "target": "ES6",
     "module": "ESNext",
-    "moduleResolution": "node",
+    "moduleResolution": "Node16",
     "sourceMap": true,
     "lib": ["es6"],
     "noImplicitReturns": true,