import { customElements, HTMLElement } from '@lit-labs/ssr-dom-shim';
import { getCompatibleStyle, adoptStyles } from './css-tag.js';
export { CSSResult, adoptStyles, css, getCompatibleStyle, supportsAdoptingStyleSheets, unsafeCSS } from './css-tag.js';
/**
* @license
* Copyright 2017 Google LLC
* SPDX-License-Identifier: BSD-3-Clause
*/
var _a, _b, _c, _d;
var _e;
const global = globalThis ;
{
(_a = global.customElements) !== null && _a !== void 0 ? _a : (global.customElements = customElements);
}
let requestUpdateThenable;
let issueWarning;
const trustedTypes = global
.trustedTypes;
// Temporary workaround for https://crbug.com/993268
// Currently, any attribute starting with "on" is considered to be a
// TrustedScript source. Such boolean attributes must be set to the equivalent
// trusted emptyScript value.
const emptyStringForBooleanAttribute = trustedTypes
? trustedTypes.emptyScript
: '';
const polyfillSupport = global.reactiveElementPolyfillSupportDevMode
;
{
// Ensure warnings are issued only 1x, even if multiple versions of Lit
// are loaded.
const issuedWarnings = ((_b = global.litIssuedWarnings) !== null && _b !== void 0 ? _b : (global.litIssuedWarnings = new Set()));
// Issue a warning, if we haven't already.
issueWarning = (code, warning) => {
warning += ` See https://lit.dev/msg/${code} for more information.`;
if (!issuedWarnings.has(warning)) {
console.warn(warning);
issuedWarnings.add(warning);
}
};
issueWarning('dev-mode', `Lit is in dev mode. Not recommended for production!`);
// Issue polyfill support warning.
if (((_c = global.ShadyDOM) === null || _c === void 0 ? void 0 : _c.inUse) && polyfillSupport === undefined) {
issueWarning('polyfill-support-missing', `Shadow DOM is being polyfilled via \`ShadyDOM\` but ` +
`the \`polyfill-support\` module has not been loaded.`);
}
requestUpdateThenable = (name) => ({
then: (onfulfilled, _onrejected) => {
issueWarning('request-update-promise', `The \`requestUpdate\` method should no longer return a Promise but ` +
`does so on \`${name}\`. Use \`updateComplete\` instead.`);
if (onfulfilled !== undefined) {
onfulfilled(false);
}
},
});
}
/**
* Useful for visualizing and logging insights into what the Lit template system is doing.
*
* Compiled out of prod mode builds.
*/
const debugLogEvent = (event) => {
const shouldEmit = global
.emitLitDebugLogEvents;
if (!shouldEmit) {
return;
}
global.dispatchEvent(new CustomEvent('lit-debug', {
detail: event,
}));
}
;
/*
* When using Closure Compiler, JSCompiler_renameProperty(property, object) is
* replaced at compile time by the munged name for object[property]. We cannot
* alias this function, so we have to use a small shim that has the same
* behavior when not compiling.
*/
/*@__INLINE__*/
const JSCompiler_renameProperty = (prop, _obj) => prop;
const defaultConverter = {
toAttribute(value, type) {
switch (type) {
case Boolean:
value = value ? emptyStringForBooleanAttribute : null;
break;
case Object:
case Array:
// if the value is `null` or `undefined` pass this through
// to allow removing/no change behavior.
value = value == null ? value : JSON.stringify(value);
break;
}
return value;
},
fromAttribute(value, type) {
let fromValue = value;
switch (type) {
case Boolean:
fromValue = value !== null;
break;
case Number:
fromValue = value === null ? null : Number(value);
break;
case Object:
case Array:
// Do *not* generate exception when invalid JSON is set as elements
// don't normally complain on being mis-configured.
// TODO(sorvell): Do generate exception in *dev mode*.
try {
// Assert to adhere to Bazel's "must type assert JSON parse" rule.
fromValue = JSON.parse(value);
}
catch (e) {
fromValue = null;
}
break;
}
return fromValue;
},
};
/**
* Change function that returns true if `value` is different from `oldValue`.
* This method is used as the default for a property's `hasChanged` function.
*/
const notEqual = (value, old) => {
// This ensures (old==NaN, value==NaN) always returns false
return old !== value && (old === old || value === value);
};
const defaultPropertyDeclaration = {
attribute: true,
type: String,
converter: defaultConverter,
reflect: false,
hasChanged: notEqual,
};
/**
* The Closure JS Compiler doesn't currently have good support for static
* property semantics where "this" is dynamic (e.g.
* https://github.com/google/closure-compiler/issues/3177 and others) so we use
* this hack to bypass any rewriting by the compiler.
*/
const finalized = 'finalized';
/**
* Base element class which manages element properties and attributes. When
* properties change, the `update` method is asynchronously called. This method
* should be supplied by subclassers to render updates as desired.
* @noInheritDoc
*/
class ReactiveElement
// In the Node build, this `extends` clause will be substituted with
// `(globalThis.HTMLElement ?? HTMLElement)`.
//
// This way, we will first prefer any global `HTMLElement` polyfill that the
// user has assigned, and then fall back to the `HTMLElement` shim which has
// been imported (see note at the top of this file about how this import is
// generated by Rollup). Note that the `HTMLElement` variable has been
// shadowed by this import, so it no longer refers to the global.
extends (globalThis.HTMLElement ?? HTMLElement) {
constructor() {
super();
this.__instanceProperties = new Map();
/**
* True if there is a pending update as a result of calling `requestUpdate()`.
* Should only be read.
* @category updates
*/
this.isUpdatePending = false;
/**
* Is set to `true` after the first update. The element code cannot assume
* that `renderRoot` exists before the element `hasUpdated`.
* @category updates
*/
this.hasUpdated = false;
/**
* Name of currently reflecting property
*/
this.__reflectingProperty = null;
this.__initialize();
}
/**
* 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) {
var _a;
this.finalize();
((_a = this._initializers) !== null && _a !== void 0 ? _a : (this._initializers = [])).push(initializer);
}
/**
* Returns a list of attributes corresponding to the registered properties.
* @nocollapse
* @category attributes
*/
static get observedAttributes() {
// note: piggy backing on this to ensure we're finalized.
this.finalize();
const attributes = [];
// Use forEach so this works even if for/of loops are compiled to for loops
// expecting arrays
this.elementProperties.forEach((v, p) => {
const attr = this.__attributeNameForProperty(p, v);
if (attr !== undefined) {
this.__attributeToPropertyMap.set(attr, p);
attributes.push(attr);
}
});
return attributes;
}
/**
* 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, options = defaultPropertyDeclaration) {
var _a;
// if this is a state property, force the attribute to false.
if (options.state) {
// Cast as any since this is readonly.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
options.attribute = false;
}
// Note, since this can be called by the `@property` decorator which
// is called before `finalize`, we ensure finalization has been kicked off.
this.finalize();
this.elementProperties.set(name, options);
// Do not generate an accessor if the prototype already has one, since
// it would be lost otherwise and that would never be the user's intention;
// Instead, we expect users to call `requestUpdate` themselves from
// user-defined accessors. Note that if the super has an accessor we will
// still overwrite it
if (!options.noAccessor && !this.prototype.hasOwnProperty(name)) {
const key = typeof name === 'symbol' ? Symbol() : `__${name}`;
const descriptor = this.getPropertyDescriptor(name, key, options);
if (descriptor !== undefined) {
Object.defineProperty(this.prototype, name, descriptor);
{
// If this class doesn't have its own set, create one and initialize
// with the values in the set from the nearest ancestor class, if any.
if (!this.hasOwnProperty('__reactivePropertyKeys')) {
this.__reactivePropertyKeys = new Set((_a = this.__reactivePropertyKeys) !== null && _a !== void 0 ? _a : []);
}
this.__reactivePropertyKeys.add(name);
}
}
}
}
/**
* 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
*/
static getPropertyDescriptor(name, key, options) {
return {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
get() {
return this[key];
},
set(value) {
const oldValue = this[name];
this[key] = value;
this.requestUpdate(name, oldValue, options);
},
configurable: true,
enumerable: true,
};
}
/**
* 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) {
return this.elementProperties.get(name) || defaultPropertyDeclaration;
}
/**
* Creates property accessors for registered properties, sets up element
* styling, and ensures any superclasses are also finalized. Returns true if
* the element was finalized.
* @nocollapse
*/
static finalize() {
if (this.hasOwnProperty(finalized)) {
return false;
}
this[finalized] = true;
// finalize any superclasses
const superCtor = Object.getPrototypeOf(this);
superCtor.finalize();
// Create own set of initializers for this class if any exist on the
// superclass and copy them down. Note, for a small perf boost, avoid
// creating initializers unless needed.
if (superCtor._initializers !== undefined) {
this._initializers = [...superCtor._initializers];
}
this.elementProperties = new Map(superCtor.elementProperties);
// initialize Map populated in observedAttributes
this.__attributeToPropertyMap = new Map();
// make any properties
// Note, only process "own" properties since this element will inherit
// any properties defined on the superClass, and finalization ensures
// the entire prototype chain is finalized.
if (this.hasOwnProperty(JSCompiler_renameProperty('properties'))) {
const props = this.properties;
// support symbols in properties (IE11 does not support this)
const propKeys = [
...Object.getOwnPropertyNames(props),
...Object.getOwnPropertySymbols(props),
];
// This for/of is ok because propKeys is an array
for (const p of propKeys) {
// note, use of `any` is due to TypeScript lack of support for symbol in
// index types
// eslint-disable-next-line @typescript-eslint/no-explicit-any
this.createProperty(p, props[p]);
}
}
this.elementStyles = this.finalizeStyles(this.styles);
// DEV mode warnings
{
const warnRemovedOrRenamed = (name, renamed = false) => {
if (this.prototype.hasOwnProperty(name)) {
issueWarning(renamed ? 'renamed-api' : 'removed-api', `\`${name}\` is implemented on class ${this.name}. It ` +
`has been ${renamed ? 'renamed' : 'removed'} ` +
`in this version of LitElement.`);
}
};
warnRemovedOrRenamed('initialize');
warnRemovedOrRenamed('requestUpdateInternal');
warnRemovedOrRenamed('_getUpdateComplete', true);
}
return true;
}
/**
* Takes the styles the user supplied via the `static styles` property and
* returns the array of styles to apply to the element.
* Override this method to integrate into a style management system.
*
* Styles are deduplicated preserving the _last_ instance in the list. This
* is a performance optimization to avoid duplicated styles that can occur
* especially when composing via subclassing. The last item is kept to try
* to preserve the cascade order with the assumption that it's most important
* that last added styles override previous styles.
*
* @nocollapse
* @category styles
*/
static finalizeStyles(styles) {
const elementStyles = [];
if (Array.isArray(styles)) {
// Dedupe the flattened array in reverse order to preserve the last items.
// Casting to Array works around TS error that
// appears to come from trying to flatten a type CSSResultArray.
const set = new Set(styles.flat(Infinity).reverse());
// Then preserve original order by adding the set items in reverse order.
for (const s of set) {
elementStyles.unshift(getCompatibleStyle(s));
}
}
else if (styles !== undefined) {
elementStyles.push(getCompatibleStyle(styles));
}
return elementStyles;
}
/**
* Returns the property name for the given attribute `name`.
* @nocollapse
*/
static __attributeNameForProperty(name, options) {
const attribute = options.attribute;
return attribute === false
? undefined
: typeof attribute === 'string'
? attribute
: typeof name === 'string'
? name.toLowerCase()
: undefined;
}
/**
* Internal only override point for customizing work done when elements
* are constructed.
*/
__initialize() {
var _a;
this.__updatePromise = new Promise((res) => (this.enableUpdating = res));
this._$changedProperties = new Map();
this.__saveInstanceProperties();
// ensures first update will be caught by an early access of
// `updateComplete`
this.requestUpdate();
(_a = this.constructor._initializers) === null || _a === void 0 ? void 0 : _a.forEach((i) => i(this));
}
/**
* 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) {
var _a, _b;
((_a = this.__controllers) !== null && _a !== void 0 ? _a : (this.__controllers = [])).push(controller);
// If a controller is added after the element has been connected,
// call hostConnected. Note, re-using existence of `renderRoot` here
// (which is set in connectedCallback) to avoid the need to track a
// first connected state.
if (this.renderRoot !== undefined && this.isConnected) {
(_b = controller.hostConnected) === null || _b === void 0 ? void 0 : _b.call(controller);
}
}
/**
* Removes a `ReactiveController` from the element.
* @category controllers
*/
removeController(controller) {
var _a;
// Note, if the indexOf is -1, the >>> will flip the sign which makes the
// splice do nothing.
(_a = this.__controllers) === null || _a === void 0 ? void 0 : _a.splice(this.__controllers.indexOf(controller) >>> 0, 1);
}
/**
* 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. Note, on very old versions of Safari (<=9) or Chrome
* (<=41), properties created for native platform properties like (`id` or
* `name`) may not have default values set in the element constructor. On
* these browsers native properties appear on instances and therefore their
* default value will overwrite any element default (e.g. if the element sets
* this.id = 'id' in the constructor, the 'id' will become '' since this is
* the native platform default).
*/
__saveInstanceProperties() {
// Use forEach so this works even if for/of loops are compiled to for loops
// expecting arrays
this.constructor.elementProperties.forEach((_v, p) => {
if (this.hasOwnProperty(p)) {
this.__instanceProperties.set(p, this[p]);
delete this[p];
}
});
}
/**
* 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
*/
createRenderRoot() {
var _a;
const renderRoot = (_a = this.shadowRoot) !== null && _a !== void 0 ? _a : this.attachShadow(this.constructor.shadowRootOptions);
adoptStyles(renderRoot, this.constructor.elementStyles);
return renderRoot;
}
/**
* On first connection, creates the element's renderRoot, sets up
* element styling, and enables updating.
* @category lifecycle
*/
connectedCallback() {
var _a;
// create renderRoot before first update.
if (this.renderRoot === undefined) {
this.renderRoot = this.createRenderRoot();
}
this.enableUpdating(true);
(_a = this.__controllers) === null || _a === void 0 ? void 0 : _a.forEach((c) => { var _a; return (_a = c.hostConnected) === null || _a === void 0 ? void 0 : _a.call(c); });
}
/**
* 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
*/
enableUpdating(_requestedUpdate) { }
/**
* 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() {
var _a;
(_a = this.__controllers) === null || _a === void 0 ? void 0 : _a.forEach((c) => { var _a; return (_a = c.hostDisconnected) === null || _a === void 0 ? void 0 : _a.call(c); });
}
/**
* 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 [using the lifecycle callbacks](https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements#using_the_lifecycle_callbacks)
* on MDN for more information about the `attributeChangedCallback`.
* @category attributes
*/
attributeChangedCallback(name, _old, value) {
this._$attributeToProperty(name, value);
}
__propertyToAttribute(name, value, options = defaultPropertyDeclaration) {
var _a;
const attr = this.constructor.__attributeNameForProperty(name, options);
if (attr !== undefined && options.reflect === true) {
const converter = ((_a = options.converter) === null || _a === void 0 ? void 0 : _a.toAttribute) !==
undefined
? options.converter
: defaultConverter;
const attrValue = converter.toAttribute(value, options.type);
if (this.constructor.enabledWarnings.indexOf('migration') >= 0 &&
attrValue === undefined) {
issueWarning('undefined-attribute-value', `The attribute value for the ${name} property is ` +
`undefined on element ${this.localName}. The attribute will be ` +
`removed, but in the previous version of \`ReactiveElement\`, ` +
`the attribute would not have changed.`);
}
// Track if the property is being reflected to avoid
// setting the property again via `attributeChangedCallback`. Note:
// 1. this takes advantage of the fact that the callback is synchronous.
// 2. will behave incorrectly if multiple attributes are in the reaction
// stack at time of calling. However, since we process attributes
// in `update` this should not be possible (or an extreme corner case
// that we'd like to discover).
// mark state reflecting
this.__reflectingProperty = name;
if (attrValue == null) {
this.removeAttribute(attr);
}
else {
this.setAttribute(attr, attrValue);
}
// mark state not reflecting
this.__reflectingProperty = null;
}
}
/** @internal */
_$attributeToProperty(name, value) {
var _a;
const ctor = this.constructor;
// Note, hint this as an `AttributeMap` so closure clearly understands
// the type; it has issues with tracking types through statics
const propName = ctor.__attributeToPropertyMap.get(name);
// Use tracking info to avoid reflecting a property value to an attribute
// if it was just set because the attribute changed.
if (propName !== undefined && this.__reflectingProperty !== propName) {
const options = ctor.getPropertyOptions(propName);
const converter = typeof options.converter === 'function'
? { fromAttribute: options.converter }
: ((_a = options.converter) === null || _a === void 0 ? void 0 : _a.fromAttribute) !== undefined
? options.converter
: defaultConverter;
// mark state reflecting
this.__reflectingProperty = propName;
this[propName] = converter.fromAttribute(value, options.type
// eslint-disable-next-line @typescript-eslint/no-explicit-any
);
// mark state not reflecting
this.__reflectingProperty = null;
}
}
/**
* 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
* @category updates
*/
requestUpdate(name, oldValue, options) {
let shouldRequestUpdate = true;
// If we have a property key, perform property update steps.
if (name !== undefined) {
options =
options ||
this.constructor.getPropertyOptions(name);
const hasChanged = options.hasChanged || notEqual;
if (hasChanged(this[name], oldValue)) {
if (!this._$changedProperties.has(name)) {
this._$changedProperties.set(name, oldValue);
}
// Add to reflecting properties set.
// Note, it's important that every change has a chance to add the
// property to `_reflectingProperties`. This ensures setting
// attribute + property reflects correctly.
if (options.reflect === true && this.__reflectingProperty !== name) {
if (this.__reflectingProperties === undefined) {
this.__reflectingProperties = new Map();
}
this.__reflectingProperties.set(name, options);
}
}
else {
// Abort the request if the property should not be considered changed.
shouldRequestUpdate = false;
}
}
if (!this.isUpdatePending && shouldRequestUpdate) {
this.__updatePromise = this.__enqueueUpdate();
}
// Note, since this no longer returns a promise, in dev mode we return a
// thenable which warns if it's called.
return requestUpdateThenable(this.localName)
;
}
/**
* Sets up the element to asynchronously update.
*/
async __enqueueUpdate() {
this.isUpdatePending = true;
try {
// Ensure any previous update has resolved before updating.
// This `await` also ensures that property changes are batched.
await this.__updatePromise;
}
catch (e) {
// Refire any previous errors async so they do not disrupt the update
// cycle. Errors are refired so developers have a chance to observe
// them, and this can be done by implementing
// `window.onunhandledrejection`.
Promise.reject(e);
}
const result = this.scheduleUpdate();
// If `scheduleUpdate` returns a Promise, we await it. This is done to
// enable coordinating updates with a scheduler. Note, the result is
// checked to avoid delaying an additional microtask unless we need to.
if (result != null) {
await result;
}
return !this.isUpdatePending;
}
/**
* 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 {
* await new Promise((resolve) => requestAnimationFrame(() => resolve()));
* super.scheduleUpdate();
* }
* ```
* @category updates
*/
scheduleUpdate() {
return this.performUpdate();
}
/**
* 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.
*
* Note: To ensure `performUpdate()` synchronously completes a pending update,
* it should not be overridden. In LitElement 2.x it was suggested to override
* `performUpdate()` to also customizing update scheduling. Instead, you should now
* override `scheduleUpdate()`. For backwards compatibility with LitElement 2.x,
* scheduling updates via `performUpdate()` continues to work, but will make
* also calling `performUpdate()` to synchronously process updates difficult.
*
* @category updates
*/
performUpdate() {
var _a, _b;
// Abort any update if one is not pending when this is called.
// This can happen if `performUpdate` is called early to "flush"
// the update.
if (!this.isUpdatePending) {
return;
}
debugLogEvent === null || debugLogEvent === void 0 ? void 0 : debugLogEvent({ kind: 'update' });
// create renderRoot before first update.
if (!this.hasUpdated) {
// Produce warning if any class properties are shadowed by class fields
{
const shadowedProperties = [];
(_a = this.constructor.__reactivePropertyKeys) === null || _a === void 0 ? void 0 : _a.forEach((p) => {
var _a;
if (this.hasOwnProperty(p) && !((_a = this.__instanceProperties) === null || _a === void 0 ? void 0 : _a.has(p))) {
shadowedProperties.push(p);
}
});
if (shadowedProperties.length) {
throw new Error(`The following properties on element ${this.localName} will not ` +
`trigger updates as expected because they are set using class ` +
`fields: ${shadowedProperties.join(', ')}. ` +
`Native class fields and some compiled output will overwrite ` +
`accessors used for detecting changes. See ` +
`https://lit.dev/msg/class-field-shadowing ` +
`for more information.`);
}
}
}
// Mixin instance properties once, if they exist.
if (this.__instanceProperties) {
// Use forEach so this works even if for/of loops are compiled to for loops
// expecting arrays
// eslint-disable-next-line @typescript-eslint/no-explicit-any
this.__instanceProperties.forEach((v, p) => (this[p] = v));
this.__instanceProperties = undefined;
}
let shouldUpdate = false;
const changedProperties = this._$changedProperties;
try {
shouldUpdate = this.shouldUpdate(changedProperties);
if (shouldUpdate) {
this.willUpdate(changedProperties);
(_b = this.__controllers) === null || _b === void 0 ? void 0 : _b.forEach((c) => { var _a; return (_a = c.hostUpdate) === null || _a === void 0 ? void 0 : _a.call(c); });
this.update(changedProperties);
}
else {
this.__markUpdated();
}
}
catch (e) {
// Prevent `firstUpdated` and `updated` from running when there's an
// update exception.
shouldUpdate = false;
// Ensure element can accept additional updates after an exception.
this.__markUpdated();
throw e;
}
// The update is no longer considered pending and further updates are now allowed.
if (shouldUpdate) {
this._$didUpdate(changedProperties);
}
}
/**
* Invoked before `update()` to compute values needed during the update.
*
* Implement `willUpdate` to compute property values that depend on other
* properties and are used in the rest of the update process.
*
* ```ts
* willUpdate(changedProperties) {
* // only need to check changed properties for an expensive computation.
* if (changedProperties.has('firstName') || changedProperties.has('lastName')) {
* this.sha = computeSHA(`${this.firstName} ${this.lastName}`);
* }
* }
*
* render() {
* return html`SHA: ${this.sha}`;
* }
* ```
*
* @category updates
*/
willUpdate(_changedProperties) { }
// Note, this is an override point for polyfill-support.
// @internal
_$didUpdate(changedProperties) {
var _a;
(_a = this.__controllers) === null || _a === void 0 ? void 0 : _a.forEach((c) => { var _a; return (_a = c.hostUpdated) === null || _a === void 0 ? void 0 : _a.call(c); });
if (!this.hasUpdated) {
this.hasUpdated = true;
this.firstUpdated(changedProperties);
}
this.updated(changedProperties);
if (this.isUpdatePending &&
this.constructor.enabledWarnings.indexOf('change-in-update') >= 0) {
issueWarning('change-in-update', `Element ${this.localName} scheduled an update ` +
`(generally because a property was set) ` +
`after an update completed, causing a new update to be scheduled. ` +
`This is inefficient and should be avoided unless the next update ` +
`can only be scheduled as a side effect of the previous update.`);
}
}
__markUpdated() {
this._$changedProperties = new Map();
this.isUpdatePending = false;
}
/**
* 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() {
return this.getUpdateComplete();
}
/**
* 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
*/
getUpdateComplete() {
return this.__updatePromise;
}
/**
* 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
*/
shouldUpdate(_changedProperties) {
return true;
}
/**
* 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
*/
update(_changedProperties) {
if (this.__reflectingProperties !== undefined) {
// Use forEach so this works even if for/of loops are compiled to for
// loops expecting arrays
this.__reflectingProperties.forEach((v, k) => this.__propertyToAttribute(k, this[k], v));
this.__reflectingProperties = undefined;
}
this.__markUpdated();
}
/**
* 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
*/
updated(_changedProperties) { }
/**
* 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
*/
firstUpdated(_changedProperties) { }
}
_e = finalized;
/**
* Marks class as having finished creating properties.
*/
ReactiveElement[_e] = true;
/**
* Memoized list of all element properties, including any superclass properties.
* Created lazily on user subclasses when finalizing the class.
* @nocollapse
* @category properties
*/
ReactiveElement.elementProperties = new Map();
/**
* Memoized list of all element styles.
* Created lazily on user subclasses when finalizing the class.
* @nocollapse
* @category styles
*/
ReactiveElement.elementStyles = [];
/**
* 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
*/
ReactiveElement.shadowRootOptions = { mode: 'open' };
// Apply polyfills if available
polyfillSupport === null || polyfillSupport === void 0 ? void 0 : polyfillSupport({ ReactiveElement });
// Dev mode warnings...
{
// Default warning set.
ReactiveElement.enabledWarnings = ['change-in-update'];
const ensureOwnWarnings = function (ctor) {
if (!ctor.hasOwnProperty(JSCompiler_renameProperty('enabledWarnings'))) {
ctor.enabledWarnings = ctor.enabledWarnings.slice();
}
};
ReactiveElement.enableWarning = function (warning) {
ensureOwnWarnings(this);
if (this.enabledWarnings.indexOf(warning) < 0) {
this.enabledWarnings.push(warning);
}
};
ReactiveElement.disableWarning = function (warning) {
ensureOwnWarnings(this);
const i = this.enabledWarnings.indexOf(warning);
if (i >= 0) {
this.enabledWarnings.splice(i, 1);
}
};
}
// IMPORTANT: do not change the property name or the assignment expression.
// This line will be used in regexes to search for ReactiveElement usage.
((_d = global.reactiveElementVersions) !== null && _d !== void 0 ? _d : (global.reactiveElementVersions = [])).push('1.6.3');
if (global.reactiveElementVersions.length > 1) {
issueWarning('multiple-versions', `Multiple versions of Lit loaded. Loading multiple versions ` +
`is not recommended.`);
}
export { ReactiveElement, defaultConverter, notEqual };
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