Automatic snapshot file removal

When you stop using snapshots in a test file, the next time you run ava --update-snapshots we'll remove the left-over snapshot files. Thanks @ninevra! 4f093ab

TAP improvements

@tymfear has been on a roll improving our TAP reporter. t.log() output is now compliant with the spec 99ab93a. Tests that did not run due to timeouts are now reported 98595da.

Next-generation configuration

AVA 4 will add full support for ESM configuration files as well as allowing you to have asynchronous factory functions a2f2614. If you're using Node.js 12 or later you can opt-in to these features in AVA 3 by enabling the nextGenConfig experiment. Say in an ava.config.mjs file:

export default {
	nonSemVerExperiments: {
		nextGenConfig: true
	},
	files: ['unit-tests/**/*]
};

This also allows you to pass an .mjs file using the --config argument.

With this experiment enabled, AVA will no longer have special treatment for ava.config.js files. Instead AVA follows Node.js' behavior, so if you've set "type": "module" you must use ESM, and otherwise you must use CommonJS.

You mustn't have an ava.config.mjs file next to an ava.config.js or ava.config.cjs file.

See v3.14.0...v3.15.0 for all changes.