v6.0.0

[novemberborn]

Breaking Changes

• AVA now requires Node.js versions 18.18, 20.8 or 21. Versions 14 and 16 are no longer supported. Drop Node.js 16, upgrade minimal 18 and 20, test 21 #3251 Drop support for Node.js 14, update minimal requirements for 16, 18 and 20 #3216

• When tests finish, worker threads or child processes are no longer exited through proces.exit(). If your test file does not exit on its own, the test run will time out. Don't force-exit after tests have completed #3260

• Changes to watch mode AVA 6 watch mode #3218:

  • Watch mode can no longer be started via the ava.config.* or package.json configuration.
  • The ignoredByWatcher configuration has moved to the watchMode object, under the ignoreChanges key.
  • Watch mode now uses the built-in fs.watch() in recursive mode. This is supported on Linux in Node.js 20 or newer, and MacOS and Windows in Node.js 18 as well. There are caveats to keep in mind.

• Failed assertions now throw, meaning that any subsequent code is not executed. This also impacts the type definitions. Make assertions throw #3246

• Only native errors are now considered errors by the t.throws() and t.throwsAsync() assertions. Object.create(Error.prototype) is not a native error. Only treat native errors as errors #3229

• Changes to modules loaded through the require configuration Modernize require config #3184:

  • If such modules export a default function, this function is now invoked.
  • Local files are loaded through @ava/typescript if necessary.

Improvements

Rewritten watcher

The watcher has been rewritten. It’s now built on fs.watch() in recursive mode.

@vercel/nft is used to perform static dependency analysis, supporting ESM and CJS imports for JavaScript & TypeScript source files. This is a huge improvement over the previous runtime tracking of CJS imports, which did not support ESM.

Integration with @ava/typescript has been improved. The watcher can now detect a change to a TypeScript source file, then wait for the corresponding build output to change before re-running tests.

The ignoredByWatcher configuration has moved to the watchMode object, under the ignoreChanges key.

See #3218 and #3257.

Failed assertions now throw

Assertions now throw a TestFailure error when they fail. This error is not exported or documented and should not be used or thrown manually. You cannot catch this error in order to recover from a failure, use t.try() instead.

All assertions except for t.throws() and t.throwsAsync() now return true when they pass. This is useful for some of the assertions in TypeScript where they can be used as a type guard.

Committing a failed t.try() result now also throws.

See #3246.

t.throws() and t.throwsAsync() can now expect any error

By default, the thrown error (or rejection reason) must be a native error. You can change the assertion to expect any kind of error by setting any: true in the expectation object:

t.throws(() => { throw 'error' }, {any: true})

See #3245 by @adiSuper94.

The require configuration is now more powerful

It now loads ES modules.

Local files are loaded through @ava/typescript if necessary, so you can also write these in TypeScript.

If there is a default export function, it is invoked after loading. The function is awaited so it can do asynchronous setup before further modules are loaded. Arguments from the configuration can be passed to the function (as a [structured clone](https://developer.mozilla.org/en-US/docs/Web/API/structuredClone)).

See #3184 by @sculpt0r.

Other changes worth noting

• Internal events can now be observed (experimentally). See Expose internal events for custom reporters via config #3247 by @codetheweb. It’s experimental and undocumented.
• You can now use t.timeout.clear() to restore a previous t.timeout(). Add t.timeout.clear() to restore default behavior #3221
• Code coverage is flushed to disk at opportune moments. Pro-actively write out code coverage #3220

New Contributors

• @sculpt0r made their first contribution in Modernize require config #3184
• @ZachHaber made their first contribution in Make assert, truthy and falsy typeguards #3233
• @adiSuper94 made their first contribution in Allow throws to accept a fn/Promise that throws anything #3245
• @bricker made their first contribution in typo fix #3250

Full Changelog: v5.3.1...v6.0.0

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This discussion was created from the release v6.0.0.