use node strip-types instead of ts-node

requires dropping v20

Author: yaacovCR

.github/workflows/ci.yml

@@ -145,7 +145,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node_version_to_setup: [20, 22, 24]
+        node_version_to_setup: [22, 24]
     permissions:
       contents: read # for actions/checkout
     steps:

.mocharc.yml

@@ -4,4 +4,4 @@ check-leaks: true
 extension:
   - ts
 node-option:
-  - 'import=./resources/register-ts-node.js'
+  - 'experimental-strip-types=true'

eslint.config.mjs

@@ -44,6 +44,12 @@ export default tsConfig(
       // eslint-plugin-import tries to parse all imported files included huge ones (e.g. 'typescript')
       // that leads to very poor performance so to fix that we disable all checks on external files.
       'import/ignore': '/node_modules/',
+      n: {
+        typescriptExtensionMap: [
+          ['', '.ts'],
+          ['.ts', '.ts'],
+        ],
+      },
     },
     rules: {
       //////////////////////////////////////////////////////////////////////////////