/**
 * @license
 * Copyright 2019 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * Whether the current browser supports `adoptedStyleSheets`.
 */
declare const supportsAdoptingStyleSheets: boolean;
/**
 * A CSSResult or native CSSStyleSheet.
 *
 * In browsers that support constructible CSS style sheets, CSSStyleSheet
 * object can be used for styling along side CSSResult from the `css`
 * template tag.
 */
type CSSResultOrNative = CSSResult | CSSStyleSheet;
type CSSResultArray = Array<CSSResultOrNative | CSSResultArray>;
/**
 * A single CSSResult, CSSStyleSheet, or an array or nested arrays of those.
 */
type CSSResultGroup = CSSResultOrNative | CSSResultArray;
/**
 * A container for a string of CSS text, that may be used to create a CSSStyleSheet.
 *
 * CSSResult is the return value of `css`-tagged template literals and
 * `unsafeCSS()`. In order to ensure that CSSResults are only created via the
 * `css` tag and `unsafeCSS()`, CSSResult cannot be constructed directly.
 */
declare class CSSResult {
    ['_$cssResult$']: boolean;
    readonly cssText: string;
    private _styleSheet?;
    private _strings;
    private constructor();
    get styleSheet(): CSSStyleSheet | undefined;
    toString(): string;
}
/**
 * Wrap a value for interpolation in a {@linkcode css} tagged template literal.
 *
 * This is unsafe because untrusted CSS text can be used to phone home
 * or exfiltrate data to an attacker controlled site. Take care to only use
 * this with trusted input.
 */
declare const unsafeCSS: (value: unknown) => CSSResult;
/**
 * A template literal tag which can be used with LitElement's
 * {@linkcode LitElement.styles} property to set element styles.
 *
 * For security reasons, only literal string values and number may be used in
 * embedded expressions. To incorporate non-literal values {@linkcode unsafeCSS}
 * may be used inside an expression.
 */
declare const css: (strings: TemplateStringsArray, ...values: (CSSResultGroup | number)[]) => CSSResult;
/**
 * Applies the given styles to a `shadowRoot`. When Shadow DOM is
 * available but `adoptedStyleSheets` is not, styles are appended to the
 * `shadowRoot` to [mimic the native feature](https://developer.mozilla.org/en-US/docs/Web/API/ShadowRoot/adoptedStyleSheets).
 * Note, when shimming is used, any styles that are subsequently placed into
 * the shadowRoot should be placed *before* any shimmed adopted styles. This
 * will match spec behavior that gives adopted sheets precedence over styles in
 * shadowRoot.
 */
declare const adoptStyles: (renderRoot: ShadowRoot, styles: Array<CSSResultOrNative>) => void;
declare const getCompatibleStyle: (s: CSSResultOrNative) => CSSResultOrNative;

/**
 * @license
 * Copyright 2021 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * An object that can host Reactive Controllers and call their lifecycle
 * callbacks.
 */
interface ReactiveControllerHost {
    /**
     * Adds a controller to the host, which sets up the controller's lifecycle
     * methods to be called with the host's lifecycle.
     */
    addController(controller: ReactiveController): void;
    /**
     * Removes a controller from the host.
     */
    removeController(controller: ReactiveController): void;
    /**
     * Requests a host update which is processed asynchronously. The update can
     * be waited on via the `updateComplete` property.
     */
    requestUpdate(): void;
    /**
     * Returns a Promise that resolves when the host has completed updating.
     * The Promise value is a boolean that is `true` if the element completed the
     * update without triggering another update. The Promise result is `false` if
     * a property was set inside `updated()`. If the Promise is rejected, an
     * exception was thrown during the update.
     *
     * @return A promise of a boolean that indicates if the update resolved
     *     without triggering another update.
     */
    readonly updateComplete: Promise<boolean>;
}
/**
 * A Reactive Controller is an object that enables sub-component code
 * organization and reuse by aggregating the state, behavior, and lifecycle
 * hooks related to a single feature.
 *
 * Controllers are added to a host component, or other object that implements
 * the `ReactiveControllerHost` interface, via the `addController()` method.
 * They can hook their host components's lifecycle by implementing one or more
 * of the lifecycle callbacks, or initiate an update of the host component by
 * calling `requestUpdate()` on the host.
 */
interface ReactiveController {
    /**
     * Called when the host is connected to the component tree. For custom
     * element hosts, this corresponds to the `connectedCallback()` lifecycle,
     * which is only called when the component is connected to the document.
     */
    hostConnected?(): void;
    /**
     * Called when the host is disconnected from the component tree. For custom
     * element hosts, this corresponds to the `disconnectedCallback()` lifecycle,
     * which is called the host or an ancestor component is disconnected from the
     * document.
     */
    hostDisconnected?(): void;
    /**
     * Called during the client-side host update, just before the host calls
     * its own update.
     *
     * Code in `update()` can depend on the DOM as it is not called in
     * server-side rendering.
     */
    hostUpdate?(): void;
    /**
     * Called after a host update, just before the host calls firstUpdated and
     * updated. It is not called in server-side rendering.
     *
     */
    hostUpdated?(): void;
}

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * Use this module if you want to create your own base class extending
 * {@link ReactiveElement}.
 * @packageDocumentation
 */

/**
 * Contains types that are part of the unstable debug API.
 *
 * Everything in this API is not stable and may change or be removed in the future,
 * even on patch releases.
 */
declare namespace ReactiveUnstable {
    /**
     * When Lit is running in dev mode and `window.emitLitDebugLogEvents` is true,
     * we will emit 'lit-debug' events to window, with live details about the update and render
     * lifecycle. These can be useful for writing debug tooling and visualizations.
     *
     * Please be aware that running with window.emitLitDebugLogEvents has performance overhead,
     * making certain operations that are normally very cheap (like a no-op render) much slower,
     * because we must copy data and dispatch events.
     */
    namespace DebugLog {
        type Entry = Update;
        interface Update {
            kind: 'update';
        }
    }
}
/**
 * Converts property values to and from attribute values.
 */
interface ComplexAttributeConverter<Type = unknown, TypeHint = unknown> {
    /**
     * Called to convert an attribute value to a property
     * value.
     */
    fromAttribute?(value: string | null, type?: TypeHint): Type;
    /**
     * Called to convert a property value to an attribute
     * value.
     *
     * It returns unknown instead of string, to be compatible with
     * https://github.com/WICG/trusted-types (and similar efforts).
     */
    toAttribute?(value: Type, type?: TypeHint): unknown;
}
type AttributeConverter<Type = unknown, TypeHint = unknown> = ComplexAttributeConverter<Type> | ((value: string | null, type?: TypeHint) => Type);
/**
 * Defines options for a property accessor.
 */
interface PropertyDeclaration<Type = unknown, TypeHint = unknown> {
    /**
     * When set to `true`, indicates the property is internal private state. The
     * property should not be set by users. When using TypeScript, this property
     * should be marked as `private` or `protected`, and it is also a common
     * practice to use a leading `_` in the name. The property is not added to
     * `observedAttributes`.
     */
    readonly state?: boolean;
    /**
     * Indicates how and whether the property becomes an observed attribute.
     * If the value is `false`, the property is not added to `observedAttributes`.
     * If true or absent, the lowercased property name is observed (e.g. `fooBar`
     * becomes `foobar`). If a string, the string value is observed (e.g
     * `attribute: 'foo-bar'`).
     */
    readonly attribute?: boolean | string;
    /**
     * Indicates the type of the property. This is used only as a hint for the
     * `converter` to determine how to convert the attribute
     * to/from a property.
     */
    readonly type?: TypeHint;
    /**
     * Indicates how to convert the attribute to/from a property. If this value
     * is a function, it is used to convert the attribute value a the property
     * value. If it's an object, it can have keys for `fromAttribute` and
     * `toAttribute`. If no `toAttribute` function is provided and
     * `reflect` is set to `true`, the property value is set directly to the
     * attribute. A default `converter` is used if none is provided; it supports
     * `Boolean`, `String`, `Number`, `Object`, and `Array`. Note,
     * when a property changes and the converter is used to update the attribute,
     * the property is never updated again as a result of the attribute changing,
     * and vice versa.
     */
    readonly converter?: AttributeConverter<Type, TypeHint>;
    /**
     * Indicates if the property should reflect to an attribute.
     * If `true`, when the property is set, the attribute is set using the
     * attribute name determined according to the rules for the `attribute`
     * property option and the value of the property converted using the rules
     * from the `converter` property option.
     */
    readonly reflect?: boolean;
    /**
     * A function that indicates if a property should be considered changed when
     * it is set. The function should take the `newValue` and `oldValue` and
     * return `true` if an update should be requested.
     */
    hasChanged?(value: Type, oldValue: Type): boolean;
    /**
     * Indicates whether an accessor will be created for this property. By
     * default, an accessor will be generated for this property that requests an
     * update when set. If this flag is `true`, no accessor will be created, and
     * it will be the user's responsibility to call
     * `this.requestUpdate(propertyName, oldValue)` to request an update when
     * the property changes.
     */
    readonly noAccessor?: boolean;
    /**
     * When `true`, uses the initial value of the property as the default value,
     * which changes how attributes are handled:
     *  - The initial value does *not* reflect, even if the `reflect` option is `true`.
     *    Subsequent changes to the property will reflect, even if they are equal to the
     *     default value.
     *  - When the attribute is removed, the property is set to the default value
     *  - The initial value will not trigger an old value in the `changedProperties` map
     *    argument to update lifecycle methods.
     *
     * When set, properties must be initialized, either with a field initializer, or an
     * assignment in the constructor. Not initializing the property may lead to
     * improper handling of subsequent property assignments.
     *
     * While this behavior is opt-in, most properties that reflect to attributes should
     * use `useDefault: true` so that their initial values do not reflect.
     */
    useDefault?: boolean;
}
/**
 * Map of properties to PropertyDeclaration options. For each property an
 * accessor is made, and the property is processed according to the
 * PropertyDeclaration options.
 */
interface PropertyDeclarations {
    readonly [key: string]: PropertyDeclaration;
}
type PropertyDeclarationMap = Map<PropertyKey, PropertyDeclaration>;
/**
 * A Map of property keys to values.
 *
 * Takes an optional type parameter T, which when specified as a non-any,
 * non-unknown type, will make the Map more strongly-typed, associating the map
 * keys with their corresponding value type on T.
 *
 * Use `PropertyValues<this>` when overriding ReactiveElement.update() and
 * other lifecycle methods in order to get stronger type-checking on keys
 * and values.
 */
type PropertyValues<T = any> = T extends object ? PropertyValueMap<T> : Map<PropertyKey, unknown>;
/**
 * Do not use, instead prefer {@linkcode PropertyValues}.
 */
interface PropertyValueMap<T> extends Map<PropertyKey, unknown> {
    get<K extends keyof T>(k: K): T[K] | undefined;
    set<K extends keyof T>(key: K, value: T[K]): this;
    has<K extends keyof T>(k: K): boolean;
    delete<K extends keyof T>(k: K): boolean;
}
declare const defaultConverter: ComplexAttributeConverter;
interface HasChanged {
    (value: unknown, old: unknown): boolean;
}
/**
 * Change function that returns true if `value` is different from `oldValue`.
 * This method is used as the default for a property's `hasChanged` function.
 */
declare const notEqual: HasChanged;
/**
 * A string representing one of the supported dev mode warning categories.
 */
type WarningKind = 'change-in-update' | 'migration' | 'async-perform-update';
type Initializer = (element: ReactiveElement) => void;
declare global {
    interface SymbolConstructor {
        readonly metadata: unique symbol;
    }
}
declare global {
    var litPropertyMetadata: WeakMap<object, Map<PropertyKey, PropertyDeclaration>>;
}
/**
 * Base element class which manages element properties and attributes. When
 * properties change, the `update` method is asynchronously called. This method
 * should be supplied by subclasses to render updates as desired.
 * @noInheritDoc
 */
declare abstract class ReactiveElement extends HTMLElement implements ReactiveControllerHost {
    /**
     * Read or set all the enabled warning categories for this class.
     *
     * This property is only used in development builds.
     *
     * @nocollapse
     * @category dev-mode
     */
    static enabledWarnings?: WarningKind[];
    /**
     * Enable the given warning category for this class.
     *
     * This method only exists in development builds, so it should be accessed
     * with a guard like:
     *
     * ```ts
     * // Enable for all ReactiveElement subclasses
     * ReactiveElement.enableWarning?.('migration');
     *
     * // Enable for only MyElement and subclasses
     * MyElement.enableWarning?.('migration');
     * ```
     *
     * @nocollapse
     * @category dev-mode
     */
    static enableWarning?: (warningKind: WarningKind) => void;
    /**
     * Disable the given warning category for this class.
     *
     * This method only exists in development builds, so it should be accessed
     * with a guard like:
     *
     * ```ts
     * // Disable for all ReactiveElement subclasses
     * ReactiveElement.disableWarning?.('migration');
     *
     * // Disable for only MyElement and subclasses
     * MyElement.disableWarning?.('migration');
     * ```
     *
     * @nocollapse
     * @category dev-mode
     */
    static disableWarning?: (warningKind: WarningKind) => void;
    /**
     * Adds an initializer function to the class that is called during instance
     * construction.
     *
     * This is useful for code that runs against a `ReactiveElement`
     * subclass, such as a decorator, that needs to do work for each
     * instance, such as setting up a `ReactiveController`.
     *
     * ```ts
     * const myDecorator = (target: typeof ReactiveElement, key: string) => {
     *   target.addInitializer((instance: ReactiveElement) => {
     *     // This is run during construction of the element
     *     new MyController(instance);
     *   });
     * }
     * ```
     *
     * Decorating a field will then cause each instance to run an initializer
     * that adds a controller:
     *
     * ```ts
     * class MyElement extends LitElement {
     *   @myDecorator foo;
     * }
     * ```
     *
     * Initializers are stored per-constructor. Adding an initializer to a
     * subclass does not add it to a superclass. Since initializers are run in
     * constructors, initializers will run in order of the class hierarchy,
     * starting with superclasses and progressing to the instance's class.
     *
     * @nocollapse
     */
    static addInitializer(initializer: Initializer): void;
    static _initializers?: Initializer[];
    /**
     * Maps attribute names to properties; for example `foobar` attribute to
     * `fooBar` property. Created lazily on user subclasses when finalizing the
     * class.
     * @nocollapse
     */
    private static __attributeToPropertyMap;
    /**
     * Marks class as having been finalized, which includes creating properties
     * from `static properties`, but does *not* include all properties created
     * from decorators.
     * @nocollapse
     */
    protected static finalized: true | undefined;
    /**
     * Memoized list of all element properties, including any superclass
     * properties. Created lazily on user subclasses when finalizing the class.
     *
     * @nocollapse
     * @category properties
     */
    static elementProperties: PropertyDeclarationMap;
    /**
     * User-supplied object that maps property names to `PropertyDeclaration`
     * objects containing options for configuring reactive properties. When
     * a reactive property is set the element will update and render.
     *
     * By default properties are public fields, and as such, they should be
     * considered as primarily settable by element users, either via attribute or
     * the property itself.
     *
     * Generally, properties that are changed by the element should be private or
     * protected fields and should use the `state: true` option. Properties
     * marked as `state` do not reflect from the corresponding attribute
     *
     * However, sometimes element code does need to set a public property. This
     * should typically only be done in response to user interaction, and an event
     * should be fired informing the user; for example, a checkbox sets its
     * `checked` property when clicked and fires a `changed` event. Mutating
     * public properties should typically not be done for non-primitive (object or
     * array) properties. In other cases when an element needs to manage state, a
     * private property set with the `state: true` option should be used. When
     * needed, state properties can be initialized via public properties to
     * facilitate complex interactions.
     * @nocollapse
     * @category properties
     */
    static properties: PropertyDeclarations;
    /**
     * Memoized list of all element styles.
     * Created lazily on user subclasses when finalizing the class.
     * @nocollapse
     * @category styles
     */
    static elementStyles: Array<CSSResultOrNative>;
    /**
     * Array of styles to apply to the element. The styles should be defined
     * using the {@linkcode css} tag function, via constructible stylesheets, or
     * imported from native CSS module scripts.
     *
     * Note on Content Security Policy:
     *
     * Element styles are implemented with `<style>` tags when the browser doesn't
     * support adopted StyleSheets. To use such `<style>` tags with the style-src
     * CSP directive, the style-src value must either include 'unsafe-inline' or
     * `nonce-<base64-value>` with `<base64-value>` replaced be a server-generated
     * nonce.
     *
     * To provide a nonce to use on generated `<style>` elements, set
     * `window.litNonce` to a server-generated nonce in your page's HTML, before
     * loading application code:
     *
     * ```html
     * <script>
     *   // Generated and unique per request:
     *   window.litNonce = 'a1b2c3d4';
     * </script>
     * ```
     * @nocollapse
     * @category styles
     */
    static styles?: CSSResultGroup;
    /**
     * Returns a list of attributes corresponding to the registered properties.
     * @nocollapse
     * @category attributes
     */
    static get observedAttributes(): string[];
    private __instanceProperties?;
    /**
     * Creates a property accessor on the element prototype if one does not exist
     * and stores a {@linkcode PropertyDeclaration} for the property with the
     * given options. The property setter calls the property's `hasChanged`
     * property option or uses a strict identity check to determine whether or not
     * to request an update.
     *
     * This method may be overridden to customize properties; however,
     * when doing so, it's important to call `super.createProperty` to ensure
     * the property is setup correctly. This method calls
     * `getPropertyDescriptor` internally to get a descriptor to install.
     * To customize what properties do when they are get or set, override
     * `getPropertyDescriptor`. To customize the options for a property,
     * implement `createProperty` like this:
     *
     * ```ts
     * static createProperty(name, options) {
     *   options = Object.assign(options, {myOption: true});
     *   super.createProperty(name, options);
     * }
     * ```
     *
     * @nocollapse
     * @category properties
     */
    static createProperty(name: PropertyKey, options?: PropertyDeclaration): void;
    /**
     * Returns a property descriptor to be defined on the given named property.
     * If no descriptor is returned, the property will not become an accessor.
     * For example,
     *
     * ```ts
     * class MyElement extends LitElement {
     *   static getPropertyDescriptor(name, key, options) {
     *     const defaultDescriptor =
     *         super.getPropertyDescriptor(name, key, options);
     *     const setter = defaultDescriptor.set;
     *     return {
     *       get: defaultDescriptor.get,
     *       set(value) {
     *         setter.call(this, value);
     *         // custom action.
     *       },
     *       configurable: true,
     *       enumerable: true
     *     }
     *   }
     * }
     * ```
     *
     * @nocollapse
     * @category properties
     */
    protected static getPropertyDescriptor(name: PropertyKey, key: string | symbol, options: PropertyDeclaration): PropertyDescriptor | undefined;
    /**
     * Returns the property options associated with the given property.
     * These options are defined with a `PropertyDeclaration` via the `properties`
     * object or the `@property` decorator and are registered in
     * `createProperty(...)`.
     *
     * Note, this method should be considered "final" and not overridden. To
     * customize the options for a given property, override
     * {@linkcode createProperty}.
     *
     * @nocollapse
     * @final
     * @category properties
     */
    static getPropertyOptions(name: PropertyKey): PropertyDeclaration<unknown, unknown>;
    static [Symbol.metadata]: object & Record<PropertyKey, unknown>;
    /**
     * Initializes static own properties of the class used in bookkeeping
     * for element properties, initializers, etc.
     *
     * Can be called multiple times by code that needs to ensure these
     * properties exist before using them.
     *
     * This method ensures the superclass is finalized so that inherited
     * property metadata can be copied down.
     * @nocollapse
     */
    private static __prepare;
    /**
     * Finishes setting up the class so that it's ready to be registered
     * as a custom element and instantiated.
     *
     * This method is called by the ReactiveElement.observedAttributes getter.
     * If you override the observedAttributes getter, you must either call
     * super.observedAttributes to trigger finalization, or call finalize()
     * yourself.
     *
     * @nocollapse
     */
    protected static finalize(): void;
    /**
     * Options used when calling `attachShadow`. Set this property to customize
     * the options for the shadowRoot; for example, to create a closed
     * shadowRoot: `{mode: 'closed'}`.
     *
     * Note, these options are used in `createRenderRoot`. If this method
     * is customized, options should be respected if possible.
     * @nocollapse
     * @category rendering
     */
    static shadowRootOptions: ShadowRootInit;
    /**
     * Takes the styles the user supplied via the `static styles` property and
     * returns the array of styles to apply to the element.
     * Override this method to integrate into a style management system.
     *
     * Styles are deduplicated preserving the _last_ instance in the list. This
     * is a performance optimization to avoid duplicated styles that can occur
     * especially when composing via subclassing. The last item is kept to try
     * to preserve the cascade order with the assumption that it's most important
     * that last added styles override previous styles.
     *
     * @nocollapse
     * @category styles
     */
    protected static finalizeStyles(styles?: CSSResultGroup): Array<CSSResultOrNative>;
    /**
     * Node or ShadowRoot into which element DOM should be rendered. Defaults
     * to an open shadowRoot.
     * @category rendering
     */
    readonly renderRoot: HTMLElement | DocumentFragment;
    /**
     * Returns the property name for the given attribute `name`.
     * @nocollapse
     */
    private static __attributeNameForProperty;
    private __updatePromise;
    /**
     * True if there is a pending update as a result of calling `requestUpdate()`.
     * Should only be read.
     * @category updates
     */
    isUpdatePending: boolean;
    /**
     * Is set to `true` after the first update. The element code cannot assume
     * that `renderRoot` exists before the element `hasUpdated`.
     * @category updates
     */
    hasUpdated: boolean;
    /**
     * Records property default values when the
     * `useDefault` option is used.
     */
    private __defaultValues?;
    /**
     * Properties that should be reflected when updated.
     */
    private __reflectingProperties?;
    /**
     * Name of currently reflecting property
     */
    private __reflectingProperty;
    /**
     * Set of controllers.
     */
    private __controllers?;
    constructor();
    /**
     * Internal only override point for customizing work done when elements
     * are constructed.
     */
    private __initialize;
    /**
     * Registers a `ReactiveController` to participate in the element's reactive
     * update cycle. The element automatically calls into any registered
     * controllers during its lifecycle callbacks.
     *
     * If the element is connected when `addController()` is called, the
     * controller's `hostConnected()` callback will be immediately called.
     * @category controllers
     */
    addController(controller: ReactiveController): void;
    /**
     * Removes a `ReactiveController` from the element.
     * @category controllers
     */
    removeController(controller: ReactiveController): void;
    /**
     * Fixes any properties set on the instance before upgrade time.
     * Otherwise these would shadow the accessor and break these properties.
     * The properties are stored in a Map which is played back after the
     * constructor runs.
     */
    private __saveInstanceProperties;
    /**
     * Returns the node into which the element should render and by default
     * creates and returns an open shadowRoot. Implement to customize where the
     * element's DOM is rendered. For example, to render into the element's
     * childNodes, return `this`.
     *
     * @return Returns a node into which to render.
     * @category rendering
     */
    protected createRenderRoot(): HTMLElement | DocumentFragment;
    /**
     * On first connection, creates the element's renderRoot, sets up
     * element styling, and enables updating.
     * @category lifecycle
     */
    connectedCallback(): void;
    /**
     * Note, this method should be considered final and not overridden. It is
     * overridden on the element instance with a function that triggers the first
     * update.
     * @category updates
     */
    protected enableUpdating(_requestedUpdate: boolean): void;
    /**
     * Allows for `super.disconnectedCallback()` in extensions while
     * reserving the possibility of making non-breaking feature additions
     * when disconnecting at some point in the future.
     * @category lifecycle
     */
    disconnectedCallback(): void;
    /**
     * Synchronizes property values when attributes change.
     *
     * Specifically, when an attribute is set, the corresponding property is set.
     * You should rarely need to implement this callback. If this method is
     * overridden, `super.attributeChangedCallback(name, _old, value)` must be
     * called.
     *
     * See [responding to attribute changes](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#responding_to_attribute_changes)
     * on MDN for more information about the `attributeChangedCallback`.
     * @category attributes
     */
    attributeChangedCallback(name: string, _old: string | null, value: string | null): void;
    private __propertyToAttribute;
    /**
     * Requests an update which is processed asynchronously. This should be called
     * when an element should update based on some state not triggered by setting
     * a reactive property. In this case, pass no arguments. It should also be
     * called when manually implementing a property setter. In this case, pass the
     * property `name` and `oldValue` to ensure that any configured property
     * options are honored.
     *
     * @param name name of requesting property
     * @param oldValue old value of requesting property
     * @param options property options to use instead of the previously
     *     configured options
     * @param useNewValue if true, the newValue argument is used instead of
     *     reading the property value. This is important to use if the reactive
     *     property is a standard private accessor, as opposed to a plain
     *     property, since private members can't be dynamically read by name.
     * @param newValue the new value of the property. This is only used if
     *     `useNewValue` is true.
     * @category updates
     */
    requestUpdate(name?: PropertyKey, oldValue?: unknown, options?: PropertyDeclaration, useNewValue?: boolean, newValue?: unknown): void;
    /**
     * Sets up the element to asynchronously update.
     */
    private __enqueueUpdate;
    /**
     * Schedules an element update. You can override this method to change the
     * timing of updates by returning a Promise. The update will await the
     * returned Promise, and you should resolve the Promise to allow the update
     * to proceed. If this method is overridden, `super.scheduleUpdate()`
     * must be called.
     *
     * For instance, to schedule updates to occur just before the next frame:
     *
     * ```ts
     * override protected async scheduleUpdate(): Promise<unknown> {
     *   await new Promise((resolve) => requestAnimationFrame(() => resolve()));
     *   super.scheduleUpdate();
     * }
     * ```
     * @category updates
     */
    protected scheduleUpdate(): void | Promise<unknown>;
    /**
     * Performs an element update. Note, if an exception is thrown during the
     * update, `firstUpdated` and `updated` will not be called.
     *
     * Call `performUpdate()` to immediately process a pending update. This should
     * generally not be needed, but it can be done in rare cases when you need to
     * update synchronously.
     *
     * @category updates
     */
    protected performUpdate(): void;
    /**
     * Invoked before `update()` to compute values needed during the update.
     *
     * Implement `willUpdate` to compute property values that depend on other
     * properties and are used in the rest of the update process.
     *
     * ```ts
     * willUpdate(changedProperties) {
     *   // only need to check changed properties for an expensive computation.
     *   if (changedProperties.has('firstName') || changedProperties.has('lastName')) {
     *     this.sha = computeSHA(`${this.firstName} ${this.lastName}`);
     *   }
     * }
     *
     * render() {
     *   return html`SHA: ${this.sha}`;
     * }
     * ```
     *
     * @category updates
     */
    protected willUpdate(_changedProperties: PropertyValues): void;
    private __markUpdated;
    /**
     * Returns a Promise that resolves when the element has completed updating.
     * The Promise value is a boolean that is `true` if the element completed the
     * update without triggering another update. The Promise result is `false` if
     * a property was set inside `updated()`. If the Promise is rejected, an
     * exception was thrown during the update.
     *
     * To await additional asynchronous work, override the `getUpdateComplete`
     * method. For example, it is sometimes useful to await a rendered element
     * before fulfilling this Promise. To do this, first await
     * `super.getUpdateComplete()`, then any subsequent state.
     *
     * @return A promise of a boolean that resolves to true if the update completed
     *     without triggering another update.
     * @category updates
     */
    get updateComplete(): Promise<boolean>;
    /**
     * Override point for the `updateComplete` promise.
     *
     * It is not safe to override the `updateComplete` getter directly due to a
     * limitation in TypeScript which means it is not possible to call a
     * superclass getter (e.g. `super.updateComplete.then(...)`) when the target
     * language is ES5 (https://github.com/microsoft/TypeScript/issues/338).
     * This method should be overridden instead. For example:
     *
     * ```ts
     * class MyElement extends LitElement {
     *   override async getUpdateComplete() {
     *     const result = await super.getUpdateComplete();
     *     await this._myChild.updateComplete;
     *     return result;
     *   }
     * }
     * ```
     *
     * @return A promise of a boolean that resolves to true if the update completed
     *     without triggering another update.
     * @category updates
     */
    protected getUpdateComplete(): Promise<boolean>;
    /**
     * Controls whether or not `update()` should be called when the element requests
     * an update. By default, this method always returns `true`, but this can be
     * customized to control when to update.
     *
     * @param _changedProperties Map of changed properties with old values
     * @category updates
     */
    protected shouldUpdate(_changedProperties: PropertyValues): boolean;
    /**
     * Updates the element. This method reflects property values to attributes.
     * It can be overridden to render and keep updated element DOM.
     * Setting properties inside this method will *not* trigger
     * another update.
     *
     * @param _changedProperties Map of changed properties with old values
     * @category updates
     */
    protected update(_changedProperties: PropertyValues): void;
    /**
     * Invoked whenever the element is updated. Implement to perform
     * post-updating tasks via DOM APIs, for example, focusing an element.
     *
     * Setting properties inside this method will trigger the element to update
     * again after this update cycle completes.
     *
     * @param _changedProperties Map of changed properties with old values
     * @category updates
     */
    protected updated(_changedProperties: PropertyValues): void;
    /**
     * Invoked when the element is first updated. Implement to perform one time
     * work on the element after update.
     *
     * ```ts
     * firstUpdated() {
     *   this.renderRoot.getElementById('my-text-area').focus();
     * }
     * ```
     *
     * Setting properties inside this method will trigger the element to update
     * again after this update cycle completes.
     *
     * @param _changedProperties Map of changed properties with old values
     * @category updates
     */
    protected firstUpdated(_changedProperties: PropertyValues): void;
}

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */

declare const PartType: {
    readonly ATTRIBUTE: 1;
    readonly CHILD: 2;
    readonly PROPERTY: 3;
    readonly BOOLEAN_ATTRIBUTE: 4;
    readonly EVENT: 5;
    readonly ELEMENT: 6;
};
type PartType = (typeof PartType)[keyof typeof PartType];
interface ChildPartInfo {
    readonly type: typeof PartType.CHILD;
}
interface AttributePartInfo {
    readonly type: typeof PartType.ATTRIBUTE | typeof PartType.PROPERTY | typeof PartType.BOOLEAN_ATTRIBUTE | typeof PartType.EVENT;
    readonly strings?: ReadonlyArray<string>;
    readonly name: string;
    readonly tagName: string;
}
interface ElementPartInfo {
    readonly type: typeof PartType.ELEMENT;
}
/**
 * Information about the part a directive is bound to.
 *
 * This is useful for checking that a directive is attached to a valid part,
 * such as with directive that can only be used on attribute bindings.
 */
type PartInfo = ChildPartInfo | AttributePartInfo | ElementPartInfo;
/**
 * Base class for creating custom directives. Users should extend this class,
 * implement `render` and/or `update`, and then pass their subclass to
 * `directive`.
 */
declare abstract class Directive implements Disconnectable {
    constructor(_partInfo: PartInfo);
    get _$isConnected(): boolean;
    abstract render(...props: Array<unknown>): unknown;
    update(_part: Part, props: Array<unknown>): unknown;
}

declare class TrustedHTML {
    private constructor(); // To prevent instantiting with 'new'.
    private brand: true; // To prevent structural typing.
}

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */

/**
 * Contains types that are part of the unstable debug API.
 *
 * Everything in this API is not stable and may change or be removed in the future,
 * even on patch releases.
 */
declare namespace LitUnstable {
    /**
     * When Lit is running in dev mode and `window.emitLitDebugLogEvents` is true,
     * we will emit 'lit-debug' events to window, with live details about the update and render
     * lifecycle. These can be useful for writing debug tooling and visualizations.
     *
     * Please be aware that running with window.emitLitDebugLogEvents has performance overhead,
     * making certain operations that are normally very cheap (like a no-op render) much slower,
     * because we must copy data and dispatch events.
     */
    namespace DebugLog {
        type Entry = TemplatePrep | TemplateInstantiated | TemplateInstantiatedAndUpdated | TemplateUpdating | BeginRender | EndRender | CommitPartEntry | SetPartValue;
        interface TemplatePrep {
            kind: 'template prep';
            template: Template;
            strings: TemplateStringsArray;
            clonableTemplate: HTMLTemplateElement;
            parts: TemplatePart[];
        }
        interface BeginRender {
            kind: 'begin render';
            id: number;
            value: unknown;
            container: RenderRootNode;
            options: RenderOptions | undefined;
            part: ChildPart | undefined;
        }
        interface EndRender {
            kind: 'end render';
            id: number;
            value: unknown;
            container: RenderRootNode;
            options: RenderOptions | undefined;
            part: ChildPart;
        }
        interface TemplateInstantiated {
            kind: 'template instantiated';
            template: Template | CompiledTemplate;
            instance: TemplateInstance;
            options: RenderOptions | undefined;
            fragment: Node;
            parts: Array<Part | undefined>;
            values: unknown[];
        }
        interface TemplateInstantiatedAndUpdated {
            kind: 'template instantiated and updated';
            template: Template | CompiledTemplate;
            instance: TemplateInstance;
            options: RenderOptions | undefined;
            fragment: Node;
            parts: Array<Part | undefined>;
            values: unknown[];
        }
        interface TemplateUpdating {
            kind: 'template updating';
            template: Template | CompiledTemplate;
            instance: TemplateInstance;
            options: RenderOptions | undefined;
            parts: Array<Part | undefined>;
            values: unknown[];
        }
        interface SetPartValue {
            kind: 'set part';
            part: Part;
            value: unknown;
            valueIndex: number;
            values: unknown[];
            templateInstance: TemplateInstance;
        }
        type CommitPartEntry = CommitNothingToChildEntry | CommitText | CommitNode | CommitAttribute | CommitProperty | CommitBooleanAttribute | CommitEventListener | CommitToElementBinding;
        interface CommitNothingToChildEntry {
            kind: 'commit nothing to child';
            start: ChildNode;
            end: ChildNode | null;
            parent: Disconnectable | undefined;
            options: RenderOptions | undefined;
        }
        interface CommitText {
            kind: 'commit text';
            node: Text;
            value: unknown;
            options: RenderOptions | undefined;
        }
        interface CommitNode {
            kind: 'commit node';
            start: Node;
            parent: Disconnectable | undefined;
            value: Node;
            options: RenderOptions | undefined;
        }
        interface CommitAttribute {
            kind: 'commit attribute';
            element: Element;
            name: string;
            value: unknown;
            options: RenderOptions | undefined;
        }
        interface CommitProperty {
            kind: 'commit property';
            element: Element;
            name: string;
            value: unknown;
            options: RenderOptions | undefined;
        }
        interface CommitBooleanAttribute {
            kind: 'commit boolean attribute';
            element: Element;
            name: string;
            value: boolean;
            options: RenderOptions | undefined;
        }
        interface CommitEventListener {
            kind: 'commit event listener';
            element: Element;
            name: string;
            value: unknown;
            oldListener: unknown;
            options: RenderOptions | undefined;
            removeListener: boolean;
            addListener: boolean;
        }
        interface CommitToElementBinding {
            kind: 'commit to element binding';
            element: Element;
            value: unknown;
            options: RenderOptions | undefined;
        }
    }
}
/**
 * Used to sanitize any value before it is written into the DOM. This can be
 * used to implement a security policy of allowed and disallowed values in
 * order to prevent XSS attacks.
 *
 * One way of using this callback would be to check attributes and properties
 * against a list of high risk fields, and require that values written to such
 * fields be instances of a class which is safe by construction. Closure's Safe
 * HTML Types is one implementation of this technique (
 * https://github.com/google/safe-html-types/blob/master/doc/safehtml-types.md).
 * The TrustedTypes polyfill in API-only mode could also be used as a basis
 * for this technique (https://github.com/WICG/trusted-types).
 *
 * @param node The HTML node (usually either a #text node or an Element) that
 *     is being written to. Note that this is just an exemplar node, the write
 *     may take place against another instance of the same class of node.
 * @param name The name of an attribute or property (for example, 'href').
 * @param type Indicates whether the write that's about to be performed will
 *     be to a property or a node.
 * @return A function that will sanitize this class of writes.
 */
type SanitizerFactory = (node: Node, name: string, type: 'property' | 'attribute') => ValueSanitizer;
/**
 * A function which can sanitize values that will be written to a specific kind
 * of DOM sink.
 *
 * See SanitizerFactory.
 *
 * @param value The value to sanitize. Will be the actual value passed into
 *     the lit-html template literal, so this could be of any type.
 * @return The value to write to the DOM. Usually the same as the input value,
 *     unless sanitization is needed.
 */
type ValueSanitizer = (value: unknown) => unknown;
/** TemplateResult types */
declare const HTML_RESULT = 1;
declare const SVG_RESULT = 2;
declare const MATHML_RESULT = 3;
type ResultType = typeof HTML_RESULT | typeof SVG_RESULT | typeof MATHML_RESULT;
declare const ATTRIBUTE_PART = 1;
declare const CHILD_PART = 2;
declare const PROPERTY_PART = 3;
declare const BOOLEAN_ATTRIBUTE_PART = 4;
declare const EVENT_PART = 5;
declare const ELEMENT_PART = 6;
declare const COMMENT_PART = 7;
/**
 * The return type of the template tag functions, {@linkcode html} and
 * {@linkcode svg} when it hasn't been compiled by @lit-labs/compiler.
 *
 * A `TemplateResult` object holds all the information about a template
 * expression required to render it: the template strings, expression values,
 * and type of template (html or svg).
 *
 * `TemplateResult` objects do not create any DOM on their own. To create or
 * update DOM you need to render the `TemplateResult`. See
 * [Rendering](https://lit.dev/docs/components/rendering) for more information.
 *
 */
type UncompiledTemplateResult<T extends ResultType = ResultType> = {
    ['_$litType$']: T;
    strings: TemplateStringsArray;
    values: unknown[];
};
/**
 * This is a template result that may be either uncompiled or compiled.
 *
 * In the future, TemplateResult will be this type. If you want to explicitly
 * note that a template result is potentially compiled, you can reference this
 * type and it will continue to behave the same through the next major version
 * of Lit. This can be useful for code that wants to prepare for the next
 * major version of Lit.
 */
type MaybeCompiledTemplateResult<T extends ResultType = ResultType> = UncompiledTemplateResult<T> | CompiledTemplateResult;
/**
 * The return type of the template tag functions, {@linkcode html} and
 * {@linkcode svg}.
 *
 * A `TemplateResult` object holds all the information about a template
 * expression required to render it: the template strings, expression values,
 * and type of template (html or svg).
 *
 * `TemplateResult` objects do not create any DOM on their own. To create or
 * update DOM you need to render the `TemplateResult`. See
 * [Rendering](https://lit.dev/docs/components/rendering) for more information.
 *
 * In Lit 4, this type will be an alias of
 * MaybeCompiledTemplateResult, so that code will get type errors if it assumes
 * that Lit templates are not compiled. When deliberately working with only
 * one, use either {@linkcode CompiledTemplateResult} or
 * {@linkcode UncompiledTemplateResult} explicitly.
 */
type TemplateResult<T extends ResultType = ResultType> = UncompiledTemplateResult<T>;
type HTMLTemplateResult = TemplateResult<typeof HTML_RESULT>;
type SVGTemplateResult = TemplateResult<typeof SVG_RESULT>;
type MathMLTemplateResult = TemplateResult<typeof MATHML_RESULT>;
/**
 * A TemplateResult that has been compiled by @lit-labs/compiler, skipping the
 * prepare step.
 */
interface CompiledTemplateResult {
    ['_$litType$']: CompiledTemplate;
    values: unknown[];
}
interface CompiledTemplate extends Omit<Template, 'el'> {
    el?: HTMLTemplateElement;
    h: TemplateStringsArray;
}
/**
 * Interprets a template literal as an HTML template that can efficiently
 * render to and update a container.
 *
 * ```ts
 * const header = (title: string) => html`<h1>${title}</h1>`;
 * ```
 *
 * The `html` tag returns a description of the DOM to render as a value. It is
 * lazy, meaning no work is done until the template is rendered. When rendering,
 * if a template comes from the same expression as a previously rendered result,
 * it's efficiently updated instead of replaced.
 */
declare const html: (strings: TemplateStringsArray, ...values: unknown[]) => TemplateResult<1>;
/**
 * Interprets a template literal as an SVG fragment that can efficiently render
 * to and update a container.
 *
 * ```ts
 * const rect = svg`<rect width="10" height="10"></rect>`;
 *
 * const myImage = html`
 *   <svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
 *     ${rect}
 *   </svg>`;
 * ```
 *
 * The `svg` *tag function* should only be used for SVG fragments, or elements
 * that would be contained **inside** an `<svg>` HTML element. A common error is
 * placing an `<svg>` *element* in a template tagged with the `svg` tag
 * function. The `<svg>` element is an HTML element and should be used within a
 * template tagged with the {@linkcode html} tag function.
 *
 * In LitElement usage, it's invalid to return an SVG fragment from the
 * `render()` method, as the SVG fragment will be contained within the element's
 * shadow root and thus not be properly contained within an `<svg>` HTML
 * element.
 */
declare const svg: (strings: TemplateStringsArray, ...values: unknown[]) => TemplateResult<2>;
/**
 * Interprets a template literal as MathML fragment that can efficiently render
 * to and update a container.
 *
 * ```ts
 * const num = mathml`<mn>1</mn>`;
 *
 * const eq = html`
 *   <math>
 *     ${num}
 *   </math>`;
 * ```
 *
 * The `mathml` *tag function* should only be used for MathML fragments, or
 * elements that would be contained **inside** a `<math>` HTML element. A common
 * error is placing a `<math>` *element* in a template tagged with the `mathml`
 * tag function. The `<math>` element is an HTML element and should be used
 * within a template tagged with the {@linkcode html} tag function.
 *
 * In LitElement usage, it's invalid to return an MathML fragment from the
 * `render()` method, as the MathML fragment will be contained within the
 * element's shadow root and thus not be properly contained within a `<math>`
 * HTML element.
 */
declare const mathml: (strings: TemplateStringsArray, ...values: unknown[]) => TemplateResult<3>;
/**
 * A sentinel value that signals that a value was handled by a directive and
 * should not be written to the DOM.
 */
declare const noChange: unique symbol;
/**
 * A sentinel value that signals a ChildPart to fully clear its content.
 *
 * ```ts
 * const button = html`${
 *  user.isAdmin
 *    ? html`<button>DELETE</button>`
 *    : nothing
 * }`;
 * ```
 *
 * Prefer using `nothing` over other falsy values as it provides a consistent
 * behavior between various expression binding contexts.
 *
 * In child expressions, `undefined`, `null`, `''`, and `nothing` all behave the
 * same and render no nodes. In attribute expressions, `nothing` _removes_ the
 * attribute, while `undefined` and `null` will render an empty string. In
 * property expressions `nothing` becomes `undefined`.
 */
declare const nothing: unique symbol;
/**
 * Object specifying options for controlling lit-html rendering. Note that
 * while `render` may be called multiple times on the same `container` (and
 * `renderBefore` reference node) to efficiently update the rendered content,
 * only the options passed in during the first render are respected during
 * the lifetime of renders to that unique `container` + `renderBefore`
 * combination.
 */
interface RenderOptions {
    /**
     * An object to use as the `this` value for event listeners. It's often
     * useful to set this to the host component rendering a template.
     */
    host?: object;
    /**
     * A DOM node before which to render content in the container.
     */
    renderBefore?: ChildNode | null;
    /**
     * Node used for cloning the template (`importNode` will be called on this
     * node). This controls the `ownerDocument` of the rendered DOM, along with
     * any inherited context. Defaults to the global `document`.
     */
    creationScope?: {
        importNode(node: Node, deep?: boolean): Node;
    };
    /**
     * The initial connected state for the top-level part being rendered. If no
     * `isConnected` option is set, `AsyncDirective`s will be connected by
     * default. Set to `false` if the initial render occurs in a disconnected tree
     * and `AsyncDirective`s should see `isConnected === false` for their initial
     * render. The `part.setConnected()` method must be used subsequent to initial
     * render to change the connected state of the part.
     */
    isConnected?: boolean;
}
/**
 * The root DOM node for rendering.
 */
type RenderRootNode = HTMLElement | SVGElement | DocumentFragment;
interface DirectiveParent {
    _$parent?: DirectiveParent;
    _$isConnected: boolean;
    __directive?: Directive;
    __directives?: Array<Directive | undefined>;
}
declare class Template {
    parts: Array<TemplatePart>;
    constructor({ strings, ['_$litType$']: type }: UncompiledTemplateResult, options?: RenderOptions);
    /** @nocollapse */
    static createElement(html: TrustedHTML, _options?: RenderOptions): HTMLTemplateElement;
}
interface Disconnectable {
    _$parent?: Disconnectable;
    _$disconnectableChildren?: Set<Disconnectable>;
    _$isConnected: boolean;
}
declare function resolveDirective(part: ChildPart | AttributePart | ElementPart, value: unknown, parent?: DirectiveParent, attributeIndex?: number): unknown;

/**
 * An updateable instance of a Template. Holds references to the Parts used to
 * update the template instance.
 */
declare class TemplateInstance implements Disconnectable {
    _$template: Template;
    _$parts: Array<Part | undefined>;
    constructor(template: Template, parent: ChildPart);
    get parentNode(): Node;
    get _$isConnected(): boolean;
    _clone(options: RenderOptions | undefined): Node;
    _update(values: Array<unknown>): void;
}
type AttributeTemplatePart = {
    readonly type: typeof ATTRIBUTE_PART;
    readonly index: number;
    readonly name: string;
    readonly ctor: typeof AttributePart;
    readonly strings: ReadonlyArray<string>;
};
type ChildTemplatePart = {
    readonly type: typeof CHILD_PART;
    readonly index: number;
};
type ElementTemplatePart = {
    readonly type: typeof ELEMENT_PART;
    readonly index: number;
};
type CommentTemplatePart = {
    readonly type: typeof COMMENT_PART;
    readonly index: number;
};
/**
 * A TemplatePart represents a dynamic part in a template, before the template
 * is instantiated. When a template is instantiated Parts are created from
 * TemplateParts.
 */
type TemplatePart = ChildTemplatePart | AttributeTemplatePart | ElementTemplatePart | CommentTemplatePart;
type Part = ChildPart | AttributePart | PropertyPart | BooleanAttributePart | ElementPart | EventPart;

declare class ChildPart implements Disconnectable {
    readonly type = 2;
    readonly options: RenderOptions | undefined;
    _$committedValue: unknown;
    private _textSanitizer;
    get _$isConnected(): boolean;
    constructor(startNode: ChildNode, endNode: ChildNode | null, parent: TemplateInstance | ChildPart | undefined, options: RenderOptions | undefined);
    /**
     * The parent node into which the part renders its content.
     *
     * A ChildPart's content consists of a range of adjacent child nodes of
     * `.parentNode`, possibly bordered by 'marker nodes' (`.startNode` and
     * `.endNode`).
     *
     * - If both `.startNode` and `.endNode` are non-null, then the part's content
     * consists of all siblings between `.startNode` and `.endNode`, exclusively.
     *
     * - If `.startNode` is non-null but `.endNode` is null, then the part's
     * content consists of all siblings following `.startNode`, up to and
     * including the last child of `.parentNode`. If `.endNode` is non-null, then
     * `.startNode` will always be non-null.
     *
     * - If both `.endNode` and `.startNode` are null, then the part's content
     * consists of all child nodes of `.parentNode`.
     */
    get parentNode(): Node;
    /**
     * The part's leading marker node, if any. See `.parentNode` for more
     * information.
     */
    get startNode(): Node | null;
    /**
     * The part's trailing marker node, if any. See `.parentNode` for more
     * information.
     */
    get endNode(): Node | null;
    _$setValue(value: unknown, directiveParent?: DirectiveParent): void;
    private _insert;
    private _commitNode;
    private _commitText;
    private _commitTemplateResult;
    private _commitIterable;
}
/**
 * A top-level `ChildPart` returned from `render` that manages the connected
 * state of `AsyncDirective`s created throughout the tree below it.
 */
interface RootPart extends ChildPart {
    /**
     * Sets the connection state for `AsyncDirective`s contained within this root
     * ChildPart.
     *
     * lit-html does not automatically monitor the connectedness of DOM rendered;
     * as such, it is the responsibility of the caller to `render` to ensure that
     * `part.setConnected(false)` is called before the part object is potentially
     * discarded, to ensure that `AsyncDirective`s have a chance to dispose of
     * any resources being held. If a `RootPart` that was previously
     * disconnected is subsequently re-connected (and its `AsyncDirective`s should
     * re-connect), `setConnected(true)` should be called.
     *
     * @param isConnected Whether directives within this tree should be connected
     * or not
     */
    setConnected(isConnected: boolean): void;
}

declare class AttributePart implements Disconnectable {
    readonly type: typeof ATTRIBUTE_PART | typeof PROPERTY_PART | typeof BOOLEAN_ATTRIBUTE_PART | typeof EVENT_PART;
    readonly element: HTMLElement;
    readonly name: string;
    readonly options: RenderOptions | undefined;
    /**
     * If this attribute part represents an interpolation, this contains the
     * static strings of the interpolation. For single-value, complete bindings,
     * this is undefined.
     */
    readonly strings?: ReadonlyArray<string>;
    protected _sanitizer: ValueSanitizer | undefined;
    get tagName(): string;
    get _$isConnected(): boolean;
    constructor(element: HTMLElement, name: string, strings: ReadonlyArray<string>, parent: Disconnectable, options: RenderOptions | undefined);
}

declare class PropertyPart extends AttributePart {
    readonly type = 3;
}

declare class BooleanAttributePart extends AttributePart {
    readonly type = 4;
}

declare class EventPart extends AttributePart {
    readonly type = 5;
    constructor(element: HTMLElement, name: string, strings: ReadonlyArray<string>, parent: Disconnectable, options: RenderOptions | undefined);
    handleEvent(event: Event): void;
}

declare class ElementPart implements Disconnectable {
    element: Element;
    readonly type = 6;
    _$committedValue: undefined;
    options: RenderOptions | undefined;
    constructor(element: Element, parent: Disconnectable, options: RenderOptions | undefined);
    get _$isConnected(): boolean;
    _$setValue(value: unknown): void;
}
/**
 * END USERS SHOULD NOT RELY ON THIS OBJECT.
 *
 * Private exports for use by other Lit packages, not intended for use by
 * external users.
 *
 * We currently do not make a mangled rollup build of the lit-ssr code. In order
 * to keep a number of (otherwise private) top-level exports mangled in the
 * client side code, we export a _$LH object containing those members (or
 * helper methods for accessing private fields of those members), and then
 * re-export them for use in lit-ssr. This keeps lit-ssr agnostic to whether the
 * client-side code is being used in `dev` mode or `prod` mode.
 *
 * This has a unique name, to disambiguate it from private exports in
 * lit-element, which re-exports all of lit-html.
 *
 * @private
 */
declare const _$LH: {
    _boundAttributeSuffix: string;
    _marker: string;
    _markerMatch: string;
    _HTML_RESULT: number;
    _getTemplateHtml: (strings: TemplateStringsArray, type: ResultType) => [TrustedHTML, Array<string>];
    _TemplateInstance: typeof TemplateInstance;
    _isIterable: (value: unknown) => value is Iterable<unknown>;
    _resolveDirective: typeof resolveDirective;
    _ChildPart: typeof ChildPart;
    _AttributePart: typeof AttributePart;
    _BooleanAttributePart: typeof BooleanAttributePart;
    _EventPart: typeof EventPart;
    _PropertyPart: typeof PropertyPart;
    _ElementPart: typeof ElementPart;
};
/**
 * Renders a value, usually a lit-html TemplateResult, to the container.
 *
 * This example renders the text "Hello, Zoe!" inside a paragraph tag, appending
 * it to the container `document.body`.
 *
 * ```js
 * import {html, render} from 'lit';
 *
 * const name = "Zoe";
 * render(html`<p>Hello, ${name}!</p>`, document.body);
 * ```
 *
 * @param value Any [renderable
 *   value](https://lit.dev/docs/templates/expressions/#child-expressions),
 *   typically a {@linkcode TemplateResult} created by evaluating a template tag
 *   like {@linkcode html} or {@linkcode svg}.
 * @param container A DOM container to render to. The first render will append
 *   the rendered value to the container, and subsequent renders will
 *   efficiently update the rendered value if the same result type was
 *   previously rendered there.
 * @param options See {@linkcode RenderOptions} for options documentation.
 * @see
 * {@link https://lit.dev/docs/libraries/standalone-templates/#rendering-lit-html-templates| Rendering Lit HTML Templates}
 */
declare const render: {
    (value: unknown, container: RenderRootNode, options?: RenderOptions): RootPart;
    setSanitizer: (newSanitizer: SanitizerFactory) => void;
    createSanitizer: SanitizerFactory;
    _testOnlyClearSanitizerFactoryDoNotCallOrElse: () => void;
};

/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * The main LitElement module, which defines the {@linkcode LitElement} base
 * class and related APIs.
 *
 * LitElement components can define a template and a set of observed
 * properties. Changing an observed property triggers a re-render of the
 * element.
 *
 * Import {@linkcode LitElement} and {@linkcode html} from this module to
 * create a component:
 *
 *  ```js
 * import {LitElement, html} from 'lit-element';
 *
 * class MyElement extends LitElement {
 *
 *   // Declare observed properties
 *   static get properties() {
 *     return {
 *       adjective: {}
 *     }
 *   }
 *
 *   constructor() {
 *     this.adjective = 'awesome';
 *   }
 *
 *   // Define the element's template
 *   render() {
 *     return html`<p>your ${adjective} template here</p>`;
 *   }
 * }
 *
 * customElements.define('my-element', MyElement);
 * ```
 *
 * `LitElement` extends {@linkcode ReactiveElement} and adds lit-html
 * templating. The `ReactiveElement` class is provided for users that want to
 * build their own custom element base classes that don't use lit-html.
 *
 * @packageDocumentation
 */

/**
 * Contains types that are part of the unstable debug API.
 *
 * Everything in this API is not stable and may change or be removed in the future,
 * even on patch releases.
 */
declare namespace Unstable {
    /**
     * When Lit is running in dev mode and `window.emitLitDebugLogEvents` is true,
     * we will emit 'lit-debug' events to window, with live details about the update and render
     * lifecycle. These can be useful for writing debug tooling and visualizations.
     *
     * Please be aware that running with window.emitLitDebugLogEvents has performance overhead,
     * making certain operations that are normally very cheap (like a no-op render) much slower,
     * because we must copy data and dispatch events.
     */
    namespace DebugLog {
        type Entry = LitUnstable.DebugLog.Entry | ReactiveUnstable.DebugLog.Entry;
    }
}
/**
 * Base element class that manages element properties and attributes, and
 * renders a lit-html template.
 *
 * To define a component, subclass `LitElement` and implement a
 * `render` method to provide the component's template. Define properties
 * using the {@linkcode LitElement.properties properties} property or the
 * {@linkcode property} decorator.
 */
declare class LitElement extends ReactiveElement {
    static ['_$litElement$']: boolean;
    /**
     * @category rendering
     */
    readonly renderOptions: RenderOptions;
    private __childPart;
    /**
     * @category rendering
     */
    protected createRenderRoot(): HTMLElement | DocumentFragment;
    /**
     * Updates the element. This method reflects property values to attributes
     * and calls `render` to render DOM via lit-html. Setting properties inside
     * this method will *not* trigger another update.
     * @param changedProperties Map of changed properties with old values
     * @category updates
     */
    protected update(changedProperties: PropertyValues): void;
    /**
     * Invoked when the component is added to the document's DOM.
     *
     * In `connectedCallback()` you should setup tasks that should only occur when
     * the element is connected to the document. The most common of these is
     * adding event listeners to nodes external to the element, like a keydown
     * event handler added to the window.
     *
     * ```ts
     * connectedCallback() {
     *   super.connectedCallback();
     *   addEventListener('keydown', this._handleKeydown);
     * }
     * ```
     *
     * Typically, anything done in `connectedCallback()` should be undone when the
     * element is disconnected, in `disconnectedCallback()`.
     *
     * @category lifecycle
     */
    connectedCallback(): void;
    /**
     * Invoked when the component is removed from the document's DOM.
     *
     * This callback is the main signal to the element that it may no longer be
     * used. `disconnectedCallback()` should ensure that nothing is holding a
     * reference to the element (such as event listeners added to nodes external
     * to the element), so that it is free to be garbage collected.
     *
     * ```ts
     * disconnectedCallback() {
     *   super.disconnectedCallback();
     *   window.removeEventListener('keydown', this._handleKeydown);
     * }
     * ```
     *
     * An element may be re-connected after being disconnected.
     *
     * @category lifecycle
     */
    disconnectedCallback(): void;
    /**
     * Invoked on each update to perform rendering tasks. This method may return
     * any value renderable by lit-html's `ChildPart` - typically a
     * `TemplateResult`. Setting properties inside this method will *not* trigger
     * the element to update.
     * @category rendering
     */
    protected render(): unknown;
}
/**
 * END USERS SHOULD NOT RELY ON THIS OBJECT.
 *
 * Private exports for use by other Lit packages, not intended for use by
 * external users.
 *
 * We currently do not make a mangled rollup build of the lit-ssr code. In order
 * to keep a number of (otherwise private) top-level exports  mangled in the
 * client side code, we export a _$LE object containing those members (or
 * helper methods for accessing private fields of those members), and then
 * re-export them for use in lit-ssr. This keeps lit-ssr agnostic to whether the
 * client-side code is being used in `dev` mode or `prod` mode.
 *
 * This has a unique name, to disambiguate it from private exports in
 * lit-html, since this module re-exports all of lit-html.
 *
 * @private
 */
declare const _$LE: {
    _$attributeToProperty: (el: LitElement, name: string, value: string | null) => void;
    _$changedProperties: (el: LitElement) => any;
};

/**
 * @license
 * Copyright 2022 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
/**
 * A boolean that will be `true` in server environments like Node, and `false`
 * in browser environments. Note that your server environment or toolchain must
 * support the `"node"` export condition for this to be `true`.
 *
 * This can be used when authoring components to change behavior based on
 * whether or not the component is executing in an SSR context.
 */
declare const isServer = false;

export { AttributePart, BooleanAttributePart, CSSResult, type CSSResultArray, type CSSResultGroup, type CSSResultOrNative, ChildPart, type CompiledTemplate, type CompiledTemplateResult, type ComplexAttributeConverter, type DirectiveParent, type Disconnectable, ElementPart, EventPart, type HTMLTemplateResult, type HasChanged, type Initializer, LitElement, LitUnstable, type MathMLTemplateResult, type MaybeCompiledTemplateResult, type Part, type PropertyDeclaration, type PropertyDeclarations, PropertyPart, type PropertyValueMap, type PropertyValues, type ReactiveController, type ReactiveControllerHost, ReactiveElement, ReactiveUnstable, type RenderOptions, type RenderRootNode, type RootPart, type SVGTemplateResult, type SanitizerFactory, TemplateInstance, type TemplateResult, type UncompiledTemplateResult, Unstable, type ValueSanitizer, type WarningKind, _$LE, _$LH, adoptStyles, css, defaultConverter, getCompatibleStyle, html, isServer, mathml, noChange, notEqual, nothing, render, supportsAdoptingStyleSheets, svg, unsafeCSS };