deno permissions testing bundling release

Deno 2.5 adds permission sets, test hooks, bundle API

Permission sets in deno.json eliminate repetitive flag passing; setup/teardown APIs for Deno.test reduce test boilerplate; runtime bundle API enables programmatic bundling.

June 15, 2026

Summary

Reduces permission management overhead by centralizing context-specific grants in config. Test lifecycle hooks let you write stateful tests (databases, fixtures) without external frameworks. Bundle API brings build tooling into the runtime, enabling dynamic build pipelines.

Why it matters

Implementation verdict

Permission sets replace manual -A or repeated --allow flags for multi-command projects—ship it now. Test hooks are ready; use them instead of external test frameworks for simple fixtures. Bundle API is experimental (requires --unstable-bundle flag) and overlaps Vite; use for small static apps only, stick with Vite for complex projects.

Sources

1.permission sets that you can set in your deno.json config file
2.Deno.test.beforeAll, Deno.test.beforeEach, Deno.test.afterAll, Deno.test.afterEach
3.Deno.bundle API is experimental and must be used with the flag --unstable-bundle
4.deno bundle index.html - great for small, static apps where you just want a quick packaged build
5.DENO_AUDIT_PERMISSIONS env var that sets the path for a JSONL permission audit log

Dev Signal

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