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## [11.0.0](v10.1.0...v11.0.0) (2023-01-18)
### 💥 BREAKING CHANGES 💥
* In previous versions, the lodash.mergeWith customizer skipped source properties
that resolved to `undefined`. With this version, the customizer now unsets these properties
(sets them to `undefined`), allowing the end user to easily unset defaults (e.g. `filename`).
* `babelOptions.filename` is now set to `filepath`
by default rather than `undefined`.
* **Implicit "global" options merging is no longer supported**
In previous versions of babel-plugin-tester, any test object and fixture
configuration option could be passed directly to babel-plugin-tester and apply
"globally" across all test objects and fixtures. This was even the case for
options that made no sense in a "global" context, such as `only`, `skip`, and
`code`. In this version of babel-plugin-tester, only options explicitly listed
in the documentation can be passed directly and applied globally. Unrecognized
"rest" options are silently ignored.
* **Test/fixture configuration is resolved early and consistently**
In previous versions of babel-plugin-tester, test object and fixture
configuration options were resolved in various places, with some options getting
finalized before `it(...)` and `describe(...)` were called and others being
determined as Jest was executing the test. In this version, all configuration
options are resolved and finalized before `it(...)` and `describe(...)` are
called. This also means configurations are finalized _before_ hooks like
`beforeAll` get called by the testing framework.
* **Fixture configuration schema is standardized**
In previous versions of babel-plugin-tester, you could provide any key to
`options.json` and it would be passed as-is to the plugin under test. This made
it impossible to allow fixtures to be configured with the same flexibility as
test objects. In this version of babel-plugin-tester, fixture `options.json`
(and `options.js`) files must return a standard set of options. Non-standard
properties are silently ignored. For instance: to pass options to the plugin
under test, they must be provided via `pluginOptions`.
* **Global `setup`/`teardown` no longer overwrites local versions**
In previous versions of babel-plugin-tester, test-level `setup` and `teardown`
functions overrode global `setup` and `teardown` functions. In this version of
babel-plugin-tester, the global `setup` and `teardown` functions will be called
alongside their test-level counterparts for each test and in a well-defined
order (see documentation).
* **`TypeError` for config error; `AssertionError` for test error**
All configuration-related issues now throw `TypeError` instead of
`AssertionError`. `AssertionError` is now exclusively used for failing tests.
Additionally, the text of some error messages has been updated.
* **`error` only captures exceptions from Babel**
`error` (aka `throws`) no longer potentially captures exceptions thrown by the
`formatResult` function. If the `formatResult` function throws, the entire test
will fail immediately.
* **`error` no longer accepts arbitrary class constructors**
`error` (aka `throws`) no longer accepts arbitrary class constructors. Any
provided class constructor must extend `Error`, e.g. built-ins like
`SyntaxError` or custom error classes like `class MyError extends Error`. Thanks
to the nature of JavaScript, **providing a class constructor that does not
extend `Error` will lead to undefined behavior**.
* **Built-in TypeScript support**
TypeScript types are now included within the package itself, obviating the need
to install a separate types package. Installing the old types package alongside
this version of babel-plugin-tester will cause conflicts.
* **Global `describe` and `it` functions must be defined**
babel-plugin-tester will refuse to run if `describe`, `it`, `it.only`, or
`it.skip` are not globally available.
* **All test titles are now numbered**
All test titles are now numbered (e.g. `"1. ..."`, `"2. ..."`, etc), including
fixtures tests and tests with custom titles.
* Minimum recommended node version bumped from
10.13.0 to 14.20.0
* Plugin names are once again automatically determined
by analyzing the return value of the plugin function. Though this is
implemented in a backwards-compatible way, there is a
[small caveat](https://github.com/babel-utils/babel-plugin-tester#pluginname-inference-caveat).
#### ✨ Features
* Add support for testing presets ([73b90b3](73b90b3))
* Implement default filepath inference using Error stack trace ([9d1b321](9d1b321))
* **src:** add `exec`/`execFixture` support via Node's VM module ([4754f42](4754f42))
* **src:** add support for "only", "skip", and "title" test options in fixtures ([#90](#90)) ([89b58b5](89b58b5))
* **src:** add support for arbitrary run order of plugin under test ([#91](#91)) ([8c8b858](8c8b858))
* **src:** add support for loading prettier configuration files in fixtures ([f54deda](f54deda))
* **src:** add TEST_SKIP/TEST_NUM_SKIP/TEST_ONLY/TEST_NUM_ONLY env variable support ([13626d1](13626d1))
* **src:** bring back (lightweight) plugin name inference ([#92](#92)) ([f9ad903](f9ad903))
* **src:** implement `titleNumbering` and `restartTitleNumbering` options ([09e792d](09e792d))
* **src:** implement standard `setup`/`teardown` run order ([4ea283f](4ea283f))
* **src:** provide debug output support via debug package ([4c7c6e7](4c7c6e7))
* Windows support ([f214995](f214995))
#### 🪄 Fixes
* **src:** ensure test function errors are not swallowed by teardown function errors ([2acfe37](2acfe37))
* **src:** fix fixtureOutputExt being ignored in root options.json ([#89](#89)) ([481be19](481be19))
* **src:** fix plugin run order for fixtures to match tests ([#88](#88)) ([fbb6c19](fbb6c19))
#### ⚙️ Build system
* **deps:** bump prettier from 2.8.0 to 2.8.1 ([#98](#98)) ([0bdb351](0bdb351))
* **package:** restore @babel/[email protected] as minimum supported version ([00712c0](00712c0))
* Transmute codebase to TypeScript ([#96](#96)) ([5f588e9](5f588e9))
* Update tooling ([d5b4d9c](d5b4d9c))
#### 🔥 Reverted
* *"test: make debugging names shorter and sweeter"* ([0b869bb](0b869bb))
#### 🧙🏿 Refactored
* Lodash.mergeWith customizer now allows unsetting options by setting them to `undefined` ([74af680](74af680))
* Reorganize source into unified extensible tester pipeline w/ first-class fixtures support ([0c44392](0c44392))
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