replace jest with ava

node_modules/ava/lib/provider-manager.js

@@ -0,0 +1,53 @@
+const pkg = require('../package.json');
+const globs = require('./globs');
+
+const levels = {
+	ava3: 1,
+	pathRewrites: 2
+};
+
+exports.levels = levels;
+
+const levelsByProtocol = {
+	'ava-3': levels.ava3,
+	'ava-3.2': levels.pathRewrites
+};
+
+function load(providerModule, projectDir) {
+	const ava = {version: pkg.version};
+	const makeProvider = require(providerModule);
+
+	let fatal;
+	let level;
+	const provider = makeProvider({
+		negotiateProtocol(identifiers, {version}) {
+			const [identifier] = identifiers.filter(identifier => Reflect.has(levelsByProtocol, identifier));
+
+			if (identifier === undefined) {
+				fatal = new Error(`This version of AVA (${ava.version}) is not compatible with ${providerModule}@${version}`);
+				return null;
+			}
+
+			level = levelsByProtocol[identifier];
+
+			return {
+				ava,
+				async findFiles({extensions, patterns}) {
+					return globs.findFiles({cwd: projectDir, extensions, filePatterns: patterns});
+				},
+				identifier,
+				normalizeGlobPatterns: globs.normalizePatterns,
+				projectDir
+			};
+		}
+	});
+
+	if (fatal) {
+		throw fatal;
+	}
+
+	return {...provider, level};
+}
+
+exports.babel = projectDir => load('@ava/babel', projectDir);
+exports.typescript = projectDir => load('@ava/typescript', projectDir);