fix: types

lib/Compilation.js

@@ -4966,7 +4966,7 @@ This prevents using hashes of each other and should be avoided.`);
 	 * a child with different settings and configurations (if desired) applied. It copies all hooks, plugins
 	 * from parent (or top level compiler) and creates a child Compilation
 	 * @param {string} name name of the child compiler
-	 * @param {OutputOptions=} outputOptions // Need to convert config schema to types for this
+	 * @param {Partial<OutputOptions>=} outputOptions // Need to convert config schema to types for this
 	 * @param {Array<WebpackPluginInstance | WebpackPluginFunction>=} plugins webpack plugins that will be applied
 	 * @returns {Compiler} creates a child Compiler instance
 	 */

lib/Compiler.js

@@ -1161,7 +1161,7 @@ ${other}`);
 	 * @param {Compilation} compilation the compilation
 	 * @param {string} compilerName the compiler's name
 	 * @param {number} compilerIndex the compiler's index
-	 * @param {OutputOptions=} outputOptions the output options
+	 * @param {Partial<OutputOptions>=} outputOptions the output options
 	 * @param {WebpackPluginInstance[]=} plugins the plugins to apply
 	 * @returns {Compiler} a child compiler
 	 */

types.d.ts

@@ -2164,7 +2164,7 @@ declare class Compilation {
 	 */
 	createChildCompiler(
 		name: string,
-		outputOptions?: OutputNormalized,
+		outputOptions?: Partial<OutputNormalized>,
 		plugins?: (
 			| ((this: Compiler, compiler: Compiler) => void)
 			| WebpackPluginInstance
@@ -2412,7 +2412,7 @@ declare class Compiler {
 		compilation: Compilation,
 		compilerName: string,
 		compilerIndex: number,
-		outputOptions?: OutputNormalized,
+		outputOptions?: Partial<OutputNormalized>,
 		plugins?: WebpackPluginInstance[]
 	): Compiler;
 	isChild(): boolean;