Gate behind nonSemVerExperiments

Author: codetheweb

lib/cli.js

@@ -472,7 +472,7 @@ export default async function loadCli() { // eslint-disable-line complexity
 		});
 	}
 
-	if (combined.observeRun) {
+	if (combined.observeRun && experiments.observeRunsFromConfig) {
 		combined.observeRun({
 			events: asyncEventIteratorFromApi(api),
 		});

lib/load-config.js

@@ -8,7 +8,7 @@ import {packageConfig, packageJsonPath} from 'pkg-conf';
 
 const NO_SUCH_FILE = Symbol('no ava.config.js file');
 const MISSING_DEFAULT_EXPORT = Symbol('missing default export');
-const EXPERIMENTS = new Set();
+const EXPERIMENTS = new Set(['observeRunsFromConfig']);
 
 const importConfig = async ({configFile, fileForErrorMessage}) => {
 	const {default: config = MISSING_DEFAULT_EXPORT} = await import(url.pathToFileURL(configFile));

test/internal-events/fixtures/ava.config.js

@@ -6,6 +6,9 @@ export default {
 	files: [
 		'test.js',
 	],
+	nonSemVerExperiments: {
+		observeRunsFromConfig: true,
+	},
 	async observeRun(run) {
 		for await (const event of run.events) {
 			internalEvents.push(event);