build: package api-extractor and -model (#9920)

* fix(ExceptText): don't display import("d..-types/v10"). in return type

* Squashed 'packages/api-extractor-model/' content from commit 39ecb196c

git-subtree-dir: packages/api-extractor-model
git-subtree-split: 39ecb196ca210bdf84ba6c9cadb1bb93571849d7

* Squashed 'packages/api-extractor/' content from commit 341ad6c51

git-subtree-dir: packages/api-extractor
git-subtree-split: 341ad6c51b01656d4f73b74ad4bdb3095f9262c4

* feat(api-extractor): add api-extractor and -model

* fix: package.json docs script

* fix(SourcLink): use <> instead of function syntax

* fix: make packages private

* fix: rest params showing in docs, added labels

* fix: missed two files

* fix: cpy-cli & pnpm-lock

* fix: increase icon size

* fix: icon size again

packages/api-extractor-model/src/mixins/ApiStaticMixin.ts

@@ -0,0 +1,117 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+import type { ApiItem, IApiItemJson, IApiItemConstructor, IApiItemOptions } from '../items/ApiItem.js';
+import type { DeserializerContext } from '../model/DeserializerContext.js';
+
+/**
+ * Constructor options for {@link (IApiStaticMixinOptions:interface)}.
+ *
+ * @public
+ */
+export interface IApiStaticMixinOptions extends IApiItemOptions {
+	isStatic: boolean;
+}
+
+export interface IApiStaticMixinJson extends IApiItemJson {
+	isStatic: boolean;
+}
+
+const _isStatic: unique symbol = Symbol('ApiStaticMixin._isStatic');
+
+/**
+ * The mixin base class for API items that can have the TypeScript `static` keyword applied to them.
+ *
+ * @remarks
+ *
+ * This is part of the {@link ApiModel} hierarchy of classes, which are serializable representations of
+ * API declarations.  The non-abstract classes (e.g. `ApiClass`, `ApiEnum`, `ApiInterface`, etc.) use
+ * TypeScript "mixin" functions (e.g. `ApiDeclaredItem`, `ApiItemContainerMixin`, etc.) to add various
+ * features that cannot be represented as a normal inheritance chain (since TypeScript does not allow a child class
+ * to extend more than one base class).  The "mixin" is a TypeScript merged declaration with three components:
+ * the function that generates a subclass, an interface that describes the members of the subclass, and
+ * a namespace containing static members of the class.
+ * @public
+ */
+
+export interface ApiStaticMixin extends ApiItem {
+	/**
+	 * Whether the declaration has the TypeScript `static` keyword.
+	 */
+	readonly isStatic: boolean;
+
+	/**
+	 * @override
+	 */
+	serializeInto(jsonObject: Partial<IApiItemJson>): void;
+}
+
+/**
+ * Mixin function for {@link (ApiStaticMixin:interface)}.
+ *
+ * @param baseClass - The base class to be extended
+ * @returns A child class that extends baseClass, adding the {@link (ApiStaticMixin:interface)} functionality.
+ * @public
+ */
+export function ApiStaticMixin<TBaseClass extends IApiItemConstructor>(
+	baseClass: TBaseClass,
+): TBaseClass & (new (...args: any[]) => ApiStaticMixin) {
+	class MixedClass extends baseClass implements ApiStaticMixin {
+		public [_isStatic]: boolean;
+
+		public constructor(...args: any[]) {
+			super(...args);
+
+			const options: IApiStaticMixinOptions = args[0];
+			this[_isStatic] = options.isStatic;
+		}
+
+		/**
+		 * @override
+		 */
+		public static override onDeserializeInto(
+			options: Partial<IApiStaticMixinOptions>,
+			context: DeserializerContext,
+			jsonObject: IApiStaticMixinJson,
+		): void {
+			baseClass.onDeserializeInto(options, context, jsonObject);
+
+			options.isStatic = jsonObject.isStatic;
+		}
+
+		public get isStatic(): boolean {
+			return this[_isStatic];
+		}
+
+		/**
+		 * @override
+		 */
+		public override serializeInto(jsonObject: Partial<IApiStaticMixinJson>): void {
+			super.serializeInto(jsonObject);
+
+			jsonObject.isStatic = this.isStatic;
+		}
+	}
+
+	return MixedClass;
+}
+
+/**
+ * Static members for {@link (ApiStaticMixin:interface)}.
+ *
+ * @public
+ */
+export namespace ApiStaticMixin {
+	/**
+	 * A type guard that tests whether the specified `ApiItem` subclass extends the `ApiStaticMixin` mixin.
+	 *
+	 * @remarks
+	 *
+	 * The JavaScript `instanceof` operator cannot be used to test for mixin inheritance, because each invocation of
+	 * the mixin function produces a different subclass.  (This could be mitigated by `Symbol.hasInstance`, however
+	 * the TypeScript type system cannot invoke a runtime test.)
+	 */
+	export function isBaseClassOf(apiItem: ApiItem): apiItem is ApiStaticMixin {
+		return apiItem.hasOwnProperty(_isStatic);
+	}
+}