ci(bundlers): avoid E401 by installing ts-jest/jest via npm i with clean userconfig and explicit registry

Author: gnbm

.github/workflows/test-bundlers.yml

@@ -29,9 +29,13 @@ jobs:
       - name: 📦 Install bundler dev deps (ts-jest, jest)
         shell: bash
         run: |
-          # Use a temporary npmrc that points to the public registry only and has no tokens
-          printf "registry=https://registry.npmjs.org/\n//registry.npmjs.org/:_authToken=\nalways-auth=false\n" > "$RUNNER_TEMP/npmrc-public"
-          npm ci --prefer-online --no-audit --userconfig "$RUNNER_TEMP/npmrc-public" --prefix test/bundler
+          # Use a clean, token-free npm user config and explicit registry
+          printf "registry=https://registry.npmjs.org/\n" > "$RUNNER_TEMP/npmrc-public"
+          export NPM_CONFIG_USERCONFIG="$RUNNER_TEMP/npmrc-public"
+          # Ensure no local npmrc shadows config
+          rm -f test/bundler/.npmrc || true
+          # Install only what's needed for the preset (no lockfile, no scripts)
+          npm i -D ts-jest@29 jest@29 --no-audit --no-fund --ignore-scripts --prefer-online --registry=https://registry.npmjs.org/ --prefix test/bundler
         env:
           NPM_TOKEN: ''
           NODE_AUTH_TOKEN: ''