diff --git a/packages/dev-test/src/env/suite.spec.ts b/packages/dev-test/src/env/suite.spec.ts
index 2ffb6e2..c71c443 100644
--- a/packages/dev-test/src/env/suite.spec.ts
+++ b/packages/dev-test/src/env/suite.spec.ts
@@ -1,12 +1,6 @@
 // Copyright 2017-2026 @pezkuwi/dev-test authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import '../globals.d.ts';
-
-declare const describe: import('./suite.js').Describe;
-declare const it: import('./suite.js').It;
-declare const expect: (value: unknown) => { toBe: (expected: unknown) => void; toBeDefined: () => void };
-
 describe('describe()', () => {
   // eslint-disable-next-line jest/no-focused-tests
   describe.only('.only', () => {
diff --git a/packages/dev/src/rootEsm.spec.ts b/packages/dev/src/rootEsm.spec.ts
index 5eeb6b0..ab21951 100644
--- a/packages/dev/src/rootEsm.spec.ts
+++ b/packages/dev/src/rootEsm.spec.ts
@@ -3,16 +3,16 @@
 
 import type { Describe, It } from '@pezkuwi/dev-test/env/suite.js';
 
-declare const describe: Describe;
-declare const it: It;
-declare const expect: (value: unknown) => { toBe: (expected: boolean) => void; toEqual: (expected: unknown) => void };
-
 import fs from 'node:fs';
 import path from 'node:path';
 
 import * as testRoot from './root.js';
 import { runTests } from './rootTests.js';
 
+declare const describe: Describe;
+declare const it: It;
+declare const expect: (value: unknown) => { toBe: (expected: boolean) => void; toEqual: (expected: unknown) => void };
+
 runTests(testRoot);
 
 describe('as-built output checks', (): void => {
@@ -91,8 +91,8 @@ describe('as-built output checks', (): void => {
             jsIdx[type].includes(
               type === 'cjs'
                 ? 'require("@pezkuwi/dev/rootJs/testJson.json")'
-                // eslint-disable-next-line no-useless-escape
-                : "import testJson from '@pezkuwi/dev/rootJs/testJson.json' assert { type: \'json\' };"
+                // `with`, not `assert`: Node 22 removed import assertions
+                : "import testJson from '@pezkuwi/dev/rootJs/testJson.json' with { type: 'json' };"
             )
           ).toBe(true);
         })
diff --git a/packages/dev/src/rootJs/dynamic.d.mts b/packages/dev/src/rootJs/dynamic.d.mts
deleted file mode 100644
index d6c10d8..0000000
--- a/packages/dev/src/rootJs/dynamic.d.mts
+++ /dev/null
@@ -1,4 +0,0 @@
-// Copyright 2017-2026 @pezkuwi/dev authors & contributors
-// SPDX-License-Identifier: Apache-2.0
-
-export function sum(a: number, b: number): number;
diff --git a/packages/dev/src/rootJs/index.ts b/packages/dev/src/rootJs/index.ts
index 92ecee6..d29386c 100644
--- a/packages/dev/src/rootJs/index.ts
+++ b/packages/dev/src/rootJs/index.ts
@@ -5,7 +5,7 @@
 import './augmented.js';
 
 /** This import should appear as-in in the ouput (cjs without asserts) */
-import testJson from './testJson.json' with { type: 'json' };
+import testJson from '@pezkuwi/dev/rootJs/testJson.json' with { type: 'json' };
 
 /** Double double work, i.e. re-exports */
 export { Clazz } from './Clazz.js';
@@ -20,7 +20,7 @@ export function bigIntExp (): bigint {
 export async function dynamic (a: number, b: number): Promise<number> {
   // NOTE we go via this path so it points to the same location in both ESM
   // and CJS output (a './dynamic' import would be different otherwise)
-  const { sum } = await import('./dynamic.mjs');
+  const { sum } = await import('@pezkuwi/dev/rootJs/dynamic.mjs');
 
   // eslint-disable-next-line @typescript-eslint/no-unsafe-return
   return sum(a, b);