test: convert sse-util.test to ESM

jest.config.ts

@@ -6,7 +6,7 @@ const config: JestConfigWithTsJest = {
 	testMatch: [
 		// TODO: put this back when all unit tests are converted
 		// '**/__tests__/**/*.test.ts',
-		'**/__tests__/lib/(a*|c*|f*|i*|l*|t*|u*|v*).test.ts',
+		'**/__tests__/lib/*.test.ts',
 	],
 	setupFilesAfterEnv: ['jest-extended/all'],
 	collectCoverageFrom: ['src/**/*.ts'],

src/__tests__/lib/sse-util.test.ts

@@ -1,16 +1,14 @@
+import { jest } from '@jest/globals'
+
 import { handleSignals, sseSignals } from '../../lib/sse-util.js'
 
 
-describe('sse-util', () => {
-	describe('handleSignals', () => {
-		it('adds handler for all required Signals', () => {
-			const handler = jest.fn()
+test('handleSignals adds handler for all required Signals', () => {
+	const handler = jest.fn()
 
-			handleSignals(handler)
+	handleSignals(handler)
 
-			sseSignals.forEach(signal => {
-				expect(process.listeners(signal)).toContain(handler)
-			})
-		})
+	sseSignals.forEach(signal => {
+		expect(process.listeners(signal)).toContain(handler)
 	})
 })

src/lib/sse-util.ts

@@ -5,9 +5,8 @@ export const sseSignals: NodeJS.Signals[] = ['SIGTERM', 'SIGINT', 'SIGHUP', 'SIG
  *
  * see: https://nodejs.org/api/process.html#process_signal_events
  */
-export function handleSignals(listener: NodeJS.SignalsListener): void {
+export const handleSignals = (listener: NodeJS.SignalsListener): void =>
 	sseSignals.forEach(signal => process.on(signal, listener))
-}
 
 /**
  * error Event from eventsource doesn't always overlap with MessageEvent