chore(deps): update dependency ava to v4.0.0-rc.1 #192
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This PR contains the following updates:
4.0.0-alpha.2->4.0.0-rc.1Release Notes
avajs/ava
v4.0.0-rc.1Compare Source
AVA 4 is nearly done! We’re not expecting major breaking changes, so barring any bugs or other surprises this should be it.
As always with pre-releases though you’re best-off installing an exact version:
npm install -D -E ava@nextThe cool new stuff 🆒
Worker threads 🧑💼
By default, test files are now run in worker threads! Huge thanks to @dnlup for landing this.
Test files should run a little quicker, since it's easier to spin up a worker thread than a child process. You can use
--no-worker-threadson the command line, orworkerThreads: falsein your AVA configuration, to fall back to using child processes.Shared workers are no longer experimental 🎊
Shared workers are no longer experimental. This is a powerful feature that loads a program in a worker thread in AVA's main process and then communicate with code running in the test workers. This enables your tests to better utilize shared resources during a test run, as well as providing opportunities to set up these resources before tests start (or clean them up after).
When you use watch mode, shared workers remain loaded across runs.
Improved test selection 🤳
AVA selects test files based on your
package.jsonorava.config.*configuration files. When used on the CLI you can then provide patterns to select a subset of these files.You can now pass a folder and AVA will select the test files contained therein. Or you can provide a specific JavaScript file and AVA will run it even if it wasn’t selected by your configuration.
If AVA finds files based on the configuration, but none of those were selected to the CLI arguments, it now prints a warning.
Better monorepo support 🚝
AVA now looks for
ava.config.*files in parent directories, until it finds a directory with a.gitdirectory (or file). This lets you specify AVA configuration at the top of your monorepo and still run AVA from within each package.New snapshot format 📸
@ninevra has worked tirelessly on landing a new snapshot format. It contains all information necessary to regenerate the report file. This allows for snapshots to be updated even if tests or assertions are skipped.
Previously failing test files run first 🏃
AVA now records which test files failed in the previous run. It then prioritizes testing these files when you run AVA again. Thanks @bunysae!
ESM support 🤾
AVA 4 comes with full ES module support. Both ESM and CJS entrypoints are provided so that you can use it no matter how you manage your project.
The
ava.config.jsfile is now treated as CJS or ESM depending on module type configured in thepackage.jsonfile.ava.config.mjsis now supported.If you use JavaScript files with non-standard extensions you can configure AVA to import them.
Note that dependency tracking in watch mode does not yet work with ES modules.
Dedicated macro factory with type inference 🏭
test.macro()returns an object that can be used withtest()and hooks. Thet.contexttype is inherited fromtest. When used with TypeScript this gives much better type inference.Like with AVA 3, regular functions that also have a
titlepropertythat is a string-returning function are supported. However the type checking won’t be as good.
Source maps 🗺
AVA now uses the source map support that’s built in to Node.js itself. This should give better stack traces. However we’re not sure yet what happens if you load a program that automatically modifies stack traces.
Line number selection (where
npx ava test.js:5runs the test at line 5) now uses source maps and so should work better with TypeScript files.Assertions as type guards 💂
Most assertions now return a boolean indicating whether they passed. If you use AVA with TypeScript, you can use this as a type guard. Thanks @jmarkham828!
(This is not supported for
t.snapshot()and the "throws" assertions.)Breaking changes 💥
AVA 4 requires at least Node.js 12.22, 14.17, 16.4 or 17. Node.js 10 is no longer supported.
If installed globally, AVA will no longer use any locally installed version. Install locally and run with
npx avainstead. When running test files from another project that also has AVA installed, those test files will now fail to run (because they'll try and use that other AVA version).Ecosystem 🏞
@ava/babelhas been removed. We haven’t seen enough contributions to that package to recommend it for AVA 4. We’d be open to reinstating it in the future (just as we’d be open to support any other compilation provider).avajs/[email protected]or newer.esmpackage has been removed.Configuration 🗒
ava.config.jsnow follows the module type configured inpackage.json.ava.config.*files may be found that are outside your project directory.Tests and assertions 🥼
test.meta.fileandtest.meta.snapshotDirectoryare now file URL strings.test()andt.try()no longer take an array of test implementations. Use a loop instead.t.throws()andt.throwAsync()assertions can no longer be called with anullvalue for the expectations argument.test.cb()andt.end()have been removed. Use async functions andutil.promisify()instead.t.teardown()now executes in last-in-first-out order.Snapshots 📸
npx ava -uto rebuild your snapshots after upgrading.t.snapshot()no longer works in hooks.t.snapshot()no longer takes an options argument allowing you to customize the snapshot ID.TypeScript 🪛
instanceOfexpectation oft.throws()andt.throwsAsync()assertions must now be anErrorconstructor.test.macro()when declaring macros.unknown.MetareplacesMetaInterface, other types withInterfacesuffixes now use theFnsuffix. There may be some other changes too.4b4b2f6t.throws()andt.throwsAsync()returnundefinedwhen the assertion fails. The type definition now matches this behavior.Other changes 🤓
--configargument may now point to a file that is not alongside thepackage.jsonfile.t.timeout(), AVA itself won’t time out until your test does. Thanks @OhYash!.testand.specextensions from file names, as well astest-prefixes.New Contributors
Full changelog since Alpha 2: avajs/ava@v4.0.0-alpha.2...v4.0.0-rc.1
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