feat: index 'detects' appropriate runner

by-require.js

@@ -0,0 +1 @@
+module.exports = require('./dist/by-require');

by-spawn.js

@@ -0,0 +1 @@
+module.exports = require('./dist/by-spawn');

lib/detect.ts

@@ -0,0 +1,15 @@
+import { bySpawn } from './by-spawn';
+import type { Config } from '@jest/types';
+import type { JestEnvironment } from '@jest/environment';
+import type Runtime from 'jest-runtime';
+import type { TestResult } from '@jest/test-result';
+
+export async function detect(
+  globalConfig: Config.GlobalConfig,
+  config: Config.ProjectConfig,
+  environment: JestEnvironment,
+  runtime: Runtime,
+  testPath: string,
+): Promise<TestResult> {
+  return bySpawn(globalConfig, config, environment, runtime, testPath);
+}

lib/index.ts

@@ -1,3 +1,3 @@
-import { bySpawn } from './by-spawn';
+import { detect } from './detect';
 
-export = bySpawn;
+export = detect;