Merge pull request #275 from Financial-Times/esm-compatibility

feat: support loading ESM config files

Author: rowanmanning

lib/smoke/smoke-test.js

@@ -52,7 +52,10 @@ class SmokeTest {
 	}
 
 	async compileTests (sets) {
-		const configsToRun = await filterConfigs(this.configFile, sets, this.isInteractive);
+		let configsToRun = await filterConfigs(this.configFile, sets, this.isInteractive);
+		if (!Array.isArray(configsToRun) && configsToRun.__esModule) {
+			configsToRun = configsToRun.default;
+		}
 		const canRunCrossBrowser = await getBrowserstackConfig(this.enabledBrowsers);
 		const globalOptions = {
 			headers: this.globalHeaders,