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* @license\n * Copyright 2017 Google LLC\n * SPDX-License-Identifier: BSD-3-Clause\n */\n\n/**\n * LitElement support for hydration of content rendered using lit-ssr.\n *\n * @packageDocumentation\n *\n * @deprecated Moved to `@lit-labs/ssr-client/lit-element-hydrate-support.js`.\n */\n\nimport type {PropertyValues} from '@lit/reactive-element';\nimport {render, RenderOptions} from 'lit-html';\nimport {hydrate} from 'lit-html/experimental-hydrate.js';\nimport {HYDRATE_INTERNALS_ATTR_PREFIX} from '@lit-labs/ssr-dom-shim';\n\ninterface PatchableLitElement extends HTMLElement {\n // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/no-misused-new\n new (...args: any[]): PatchableLitElement;\n enableUpdating(requestedUpdate?: boolean): void;\n createRenderRoot(): Element | ShadowRoot;\n renderRoot: HTMLElement | DocumentFragment;\n render(): unknown;\n renderOptions: RenderOptions;\n _$needsHydration: boolean;\n}\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nglobalThis.litElementHydrateSupport = ({\n LitElement,\n}: {\n LitElement: PatchableLitElement;\n}) => {\n const observedAttributes = Object.getOwnPropertyDescriptor(\n Object.getPrototypeOf(LitElement),\n 'observedAttributes'\n )!.get!;\n\n // Add `defer-hydration` to observedAttributes\n Object.defineProperty(LitElement, 'observedAttributes', {\n get() {\n return [...observedAttributes.call(this), 'defer-hydration'];\n },\n });\n\n // Enable element when 'defer-hydration' attribute is removed by calling the\n // super.connectedCallback()\n const attributeChangedCallback =\n LitElement.prototype.attributeChangedCallback;\n LitElement.prototype.attributeChangedCallback = function (\n name: string,\n old: string | null,\n value: string | null\n ) {\n if (name === 'defer-hydration' && value === null) {\n connectedCallback.call(this);\n }\n attributeChangedCallback.call(this, name, old, value);\n };\n\n // Override `connectedCallback` to capture whether we need hydration, and\n // defer `super.connectedCallback()` if the 'defer-hydration' attribute is set\n const connectedCallback = LitElement.prototype.connectedCallback;\n LitElement.prototype.connectedCallback = function (\n this: PatchableLitElement\n ) {\n // If the outer scope of this element has not yet been hydrated, wait until\n // 'defer-hydration' attribute has been removed to enable\n if (!this.hasAttribute('defer-hydration')) {\n connectedCallback.call(this);\n }\n };\n\n // If we've been server-side rendered, just return `this.shadowRoot`, don't\n // call the base implementation, which would also adopt styles (for now)\n const createRenderRoot = LitElement.prototype.createRenderRoot;\n LitElement.prototype.createRenderRoot = function (this: PatchableLitElement) {\n if (this.shadowRoot) {\n this._$needsHydration = true;\n return this.shadowRoot;\n } else {\n return createRenderRoot.call(this);\n }\n };\n\n // Hydrate on first update when needed\n const update = Object.getPrototypeOf(LitElement.prototype).update;\n LitElement.prototype.update = function (\n this: PatchableLitElement,\n changedProperties: PropertyValues\n ) {\n const value = this.render();\n // Since this is a patch, we can't call super.update(), so we capture\n // it off the proto chain and call it instead\n update.call(this, changedProperties);\n if (this._$needsHydration) {\n this._$needsHydration = false;\n // Remove aria attributes added by internals shim during SSR\n for (let i = 0; i < this.attributes.length; i++) {\n const attr = this.attributes[i];\n if (attr.name.startsWith(HYDRATE_INTERNALS_ATTR_PREFIX)) {\n const ariaAttr = attr.name.slice(\n HYDRATE_INTERNALS_ATTR_PREFIX.length\n );\n this.removeAttribute(ariaAttr);\n this.removeAttribute(attr.name);\n }\n }\n hydrate(value, this.renderRoot, this.renderOptions);\n } else {\n render(value, this.renderRoot, this.renderOptions);\n }\n };\n};\n\nconsole.warn(\n 'Import from `lit-element/experimental-hydrate-support.js` is deprecated.' +\n 'Import `@lit-labs/ssr-client/lit-element-hydrate-support.js` instead.'\n);\n"]} |