chore: make arguments to methods in base reporter optional (#9159)

* chore: make arguemnts to methods in base reporter optional

* changelog

Author: SimenB

CHANGELOG.md

@@ -42,6 +42,7 @@
 - `[jest-leak-detector]` [**BREAKING**] Use `weak-napi` instead of `weak` package ([#8686](https://github.com/facebook/jest/pull/8686))
 - `[jest-mock]` Fix for mockReturnValue overriding mockImplementationOnce ([#8398](https://github.com/facebook/jest/pull/8398))
 - `[jest-reporters]` Make node-notifier an optional dependency ([#8918](https://github.com/facebook/jest/pull/8918))
+- `[jest-reporters]` Make all arguments to methods on `BaseReporter` optional ([#9159](https://github.com/facebook/jest/pull/9159))
 - `[jest-resolve]`: Set MODULE_NOT_FOUND as error code when module is not resolved from paths ([#8487](https://github.com/facebook/jest/pull/8487))
 - `[jest-snapshot]` Remove only the added newlines in multiline snapshots ([#8859](https://github.com/facebook/jest/pull/8859))
 - `[jest-snapshot]` Distinguish empty string from external snapshot not written ([#8880](https://github.com/facebook/jest/pull/8880))

packages/jest-reporters/src/base_reporter.ts

@@ -18,21 +18,21 @@ export default class BaseReporter implements Reporter {
     process.stderr.write(message + '\n');
   }
 
-  onRunStart(_results: AggregatedResult, _options: ReporterOnStartOptions) {
+  onRunStart(_results?: AggregatedResult, _options?: ReporterOnStartOptions) {
     preRunMessageRemove(process.stderr);
   }
 
   onTestResult(
-    _test: Test,
-    _testResult: TestResult,
-    _results: AggregatedResult,
+    _test?: Test,
+    _testResult?: TestResult,
+    _results?: AggregatedResult,
   ) {}
 
-  onTestStart(_test: Test) {}
+  onTestStart(_test?: Test) {}
 
   onRunComplete(
-    _contexts: Set<Context>,
-    _aggregatedResults: AggregatedResult,
+    _contexts?: Set<Context>,
+    _aggregatedResults?: AggregatedResult,
   ): Promise<void> | void {}
 
   protected _setError(error: Error) {