type fixes

lib/BannerPlugin.js

@@ -31,17 +31,17 @@ class BannerPlugin {
 	 * @param {BannerPluginArgument} options options object
 	 */
 	constructor(options) {
-		validateOptions(schema, options, {
-			name: "Banner Plugin",
-			baseDataPath: "options"
-		});
-
 		if (typeof options === "string" || typeof options === "function") {
 			options = {
 				banner: options
 			};
 		}
 
+		validateOptions(schema, options, {
+			name: "Banner Plugin",
+			baseDataPath: "options"
+		});
+
 		this.options = options;
 
 		const bannerOption = options.banner;

lib/validateSchema.js

@@ -11,9 +11,10 @@ const validateSchema = (schema, options) => {
 	validate(schema, options, {
 		name: "Webpack",
 		postFormatter: (formattedError, error) => {
+			const children = /** @type {TODO} */ (error).children;
 			if (
-				error.children &&
-				error.children.some(
+				children &&
+				children.some(
 					child =>
 						child.keyword === "absolutePath" &&
 						child.dataPath === ".output.filename"
@@ -23,7 +24,9 @@ const validateSchema = (schema, options) => {
 			}
 
 			if (error.keyword === "additionalProperties" && !error.dataPath) {
-				if (error.params.additionalProperty === "debug") {
+				const params =
+					/** @type {import("ajv").AdditionalPropertiesParams} */ (error.params);
+				if (params.additionalProperty === "debug") {
 					return (
 						`${formattedError}\n` +
 						"The 'debug' property was removed in webpack 2.0.0.\n" +
@@ -37,7 +40,7 @@ const validateSchema = (schema, options) => {
 					);
 				}
 
-				if (error.params.additionalProperty) {
+				if (params.additionalProperty) {
 					return (
 						`${formattedError}\n` +
 						"For typos: please correct them.\n" +
@@ -48,7 +51,7 @@ const validateSchema = (schema, options) => {
 						"    new webpack.LoaderOptionsPlugin({\n" +
 						"      // test: /\\.xxx$/, // may apply this only for some modules\n" +
 						"      options: {\n" +
-						`        ${error.params.additionalProperty}: …\n` +
+						`        ${params.additionalProperty}: …\n` +
 						"      }\n" +
 						"    })\n" +
 						"  ]"