refactor how client directives work

packages/astro/src/@types/astro.ts

@@ -881,6 +881,7 @@ export interface AstroConfig extends z.output<typeof AstroConfigSchema> {
 		adapter: AstroAdapter | undefined;
 		renderers: AstroRenderer[];
 		scripts: { stage: InjectedScriptStage; content: string }[];
+		clientDirectives: ClientDirectiveMap;
 	};
 }
 
@@ -1200,6 +1201,7 @@ export interface SSRElement {
 
 export interface SSRMetadata {
 	renderers: SSRLoadedRenderer[];
+	clientDirectives: ClientDirectiveMap;
 	pathname: string;
 	hasHydrationScript: boolean;
 	hasDirectives: Set<string>;
@@ -1220,3 +1222,18 @@ export interface SSRResult {
 }
 
 export type MarkdownAstroData = { frontmatter: object };
+
+/* Client Directives */
+export type ClientDirectiveMap = Map<string, { type: 'inline' | 'external', src: string }>;
+type Hydrate = () => Promise<void>;
+type Load = () => Promise<Hydrate>;
+
+type DirectiveOptions = {
+  // The component displayName
+  name: string;
+  // The attribute value provided,
+  // for ex `client:interactive="click"
+  value: string;
+}
+
+export type ClientDirective = (load: Load, opts: DirectiveOptions, element: HTMLElement) => void;

packages/astro/src/core/config.ts

@@ -353,6 +353,12 @@ export async function validateConfig(
 			renderers: [jsxRenderer],
 			injectedRoutes: [],
 			adapter: undefined,
+			clientDirectives: new Map([
+				['visible', {
+					type: 'external',
+					src: 'astro/runtime/client/visible.js'
+				}]
+			]),
 		},
 	};
 

packages/astro/src/core/create-vite.ts

@@ -16,6 +16,7 @@ import legacyMarkdownVitePlugin from '../vite-plugin-markdown-legacy/index.js';
 import markdownVitePlugin from '../vite-plugin-markdown/index.js';
 import astroScriptsPlugin from '../vite-plugin-scripts/index.js';
 import astroScriptsPageSSRPlugin from '../vite-plugin-scripts/page-ssr.js';
+import astroClientDirective from '../vite-plugin-client-directive/index.js';
 import { createCustomViteLogger } from './errors.js';
 import { resolveDependency } from './util.js';
 
@@ -86,6 +87,7 @@ export async function createVite(
 			astroPostprocessVitePlugin({ config: astroConfig }),
 			astroIntegrationsContainerPlugin({ config: astroConfig, logging }),
 			astroScriptsPageSSRPlugin({ config: astroConfig }),
+			astroClientDirective({ config: astroConfig, logging }),
 		],
 		publicDir: fileURLToPath(astroConfig.publicDir),
 		root: fileURLToPath(astroConfig.root),

packages/astro/src/core/render/core.ts

@@ -1,6 +1,7 @@
 import type { MarkdownRenderingOptions } from '@astrojs/markdown-remark';
 import type {
 	ComponentInstance,
+	ClientDirectiveMap,
 	Params,
 	Props,
 	RouteData,
@@ -79,6 +80,7 @@ export interface RenderOptions {
 	scripts: Set<SSRElement>;
 	resolve: (s: string) => Promise<string>;
 	renderers: SSRLoadedRenderer[];
+	clientDirectives: ClientDirectiveMap;
 	route?: RouteData;
 	routeCache: RouteCache;
 	site?: string;
@@ -91,6 +93,7 @@ export interface RenderOptions {
 export async function render(opts: RenderOptions): Promise<Response> {
 	const {
 		adapterName,
+		clientDirectives,
 		links,
 		styles,
 		logging,
@@ -145,6 +148,7 @@ export async function render(opts: RenderOptions): Promise<Response> {
 		pathname,
 		resolve,
 		renderers,
+		clientDirectives,
 		request,
 		site,
 		scripts,

packages/astro/src/core/render/dev/index.ts

@@ -168,6 +168,7 @@ export async function render(
 
 	let response = await coreRender({
 		adapterName: astroConfig.adapter?.name,
+		clientDirectives: astroConfig._ctx.clientDirectives,
 		links,
 		styles,
 		logging,

packages/astro/src/core/render/result.ts

@@ -3,6 +3,7 @@ import { bold } from 'kleur/colors';
 import type {
 	AstroGlobal,
 	AstroGlobalPartial,
+	ClientDirectiveMap,
 	Params,
 	Props,
 	RuntimeMode,
@@ -36,6 +37,7 @@ export interface CreateResultArgs {
 	pathname: string;
 	props: Props;
 	renderers: SSRLoadedRenderer[];
+	clientDirectives: ClientDirectiveMap;
 	resolve: (s: string) => Promise<string>;
 	site: string | undefined;
 	links?: Set<SSRElement>;
@@ -122,7 +124,7 @@ class Slots {
 let renderMarkdown: any = null;
 
 export function createResult(args: CreateResultArgs): SSRResult {
-	const { markdown, params, pathname, props: pageProps, renderers, request, resolve } = args;
+	const { clientDirectives, markdown, params, pathname, props: pageProps, renderers, request, resolve } = args;
 
 	const url = new URL(request.url);
 	const headers = new Headers();
@@ -274,6 +276,7 @@ const canonicalURL = new URL(Astro.url.pathname, Astro.site);
 		resolve,
 		_metadata: {
 			renderers,
+			clientDirectives,
 			pathname,
 			hasHydrationScript: false,
 			hasDirectives: new Set(),

packages/astro/src/runtime/client/visible.ts

@@ -1,11 +1,13 @@
+import { ClientDirective } from '../../@types/astro';
+
 /**
  * Hydrate this component when one of it's children becomes visible
  * We target the children because `astro-island` is set to `display: contents`
  * which doesn't work with IntersectionObserver
  */
-(self.Astro = self.Astro || {}).visible = (getHydrateCallback, _opts, root) => {
+const visible: ClientDirective = (load, _opts, root) => {
 	const cb = async () => {
-		let hydrate = await getHydrateCallback();
+		let hydrate = await load();
 		await hydrate();
 	};
 
@@ -24,4 +26,5 @@
 		io.observe(child);
 	}
 };
-window.dispatchEvent(new Event('astro:visible'));
+
+export default visible;

packages/astro/src/runtime/server/astro-island.ts

@@ -62,7 +62,7 @@ declare const Astro: {
 				start() {
 					const opts = JSON.parse(this.getAttribute('opts')!) as Record<string, any>;
 					const directive = this.getAttribute('client') as directiveAstroKeys;
-					if (Astro[directive] === undefined) {
+					if (typeof Astro === 'undefined' || Astro[directive] === undefined) {
 						window.addEventListener(`astro:${directive}`, () => this.start(), { once: true });
 						return;
 					}

packages/astro/src/runtime/server/render/common.ts

@@ -15,7 +15,7 @@ export const Renderer = Symbol.for('astro:renderer');
 // Rendering produces either marked strings of HTML or instructions for hydration.
 // These directive instructions bubble all the way up to renderPage so that we
 // can ensure they are added only once, and as soon as possible.
-export function stringifyChunk(result: SSRResult, chunk: string | RenderInstruction) {
+export function stringifyChunk(result: SSRResult, chunk: string | RenderInstruction): string | Promise<string> {
 	switch ((chunk as any).type) {
 		case 'directive': {
 			const { hydration } = chunk as RenderInstruction;
@@ -29,7 +29,7 @@ export function stringifyChunk(result: SSRResult, chunk: string | RenderInstruct
 				? 'directive'
 				: null;
 			if (prescriptType) {
-				let prescripts = getPrescripts(prescriptType, hydration.directive);
+				let prescripts = getPrescripts(result, prescriptType, hydration.directive);
 				return markHTMLString(prescripts);
 			} else {
 				return '';

packages/astro/src/runtime/server/render/page.ts

@@ -6,6 +6,7 @@ import { isAstroComponent, isAstroComponentFactory, renderAstroComponent } from
 import { stringifyChunk } from './common.js';
 import { renderComponent } from './component.js';
 import { maybeRenderHead } from './head.js';
+import { string } from 'zod';
 
 const encoder = new TextEncoder();
 const needsHeadRenderingSymbol = Symbol.for('astro.needsHeadRendering');
@@ -72,7 +73,13 @@ export async function renderPage(
 						let i = 0;
 						try {
 							for await (const chunk of iterable) {
-								let html = stringifyChunk(result, chunk);
+								let html: string;
+								let stringChunk = stringifyChunk(result, chunk);
+								if((stringChunk as any).then !== undefined) {
+									html = await stringChunk;
+								} else {
+									html = (stringChunk as string);
+								}
 
 								if (i === 0) {
 									if (!/<!doctype html/i.test(html)) {
@@ -94,7 +101,13 @@ export async function renderPage(
 			body = '';
 			let i = 0;
 			for await (const chunk of iterable) {
-				let html = stringifyChunk(result, chunk);
+				let html: string;
+				let stringChunk = stringifyChunk(result, chunk);
+				if((stringChunk as any).then !== undefined) {
+					html = await stringChunk;
+				} else {
+					html = (stringChunk as string);
+				}
 				if (i === 0) {
 					if (!/<!doctype html/i.test(html)) {
 						body += '<!DOCTYPE html>\n';

packages/astro/src/runtime/server/scripts.ts

@@ -14,6 +14,8 @@ export function determineIfNeedsHydrationScript(result: SSRResult): boolean {
 	return (result._metadata.hasHydrationScript = true);
 }
 
+const ISLAND_STYLES = `<style>astro-island,astro-slot{display:contents}</style>`;
+
 export const hydrationScripts: Record<string, string> = {
 	idle: idlePrebuilt,
 	load: loadPrebuilt,
@@ -40,18 +42,47 @@ function getDirectiveScriptText(directive: string): string {
 	return directiveScriptText;
 }
 
-export function getPrescripts(type: PrescriptType, directive: string): string {
+function getDirectiveScript(result: SSRResult, directive: string): string | Promise<string> {
+	if(!result._metadata.clientDirectives.has(directive)) {
+		// TODO better error message
+		throw new Error(`Unable to find directive ${directive}`);
+	}
+	let { type, src } = result._metadata.clientDirectives.get(directive)!;
+	switch(type) {
+		case 'external': {
+			return result.resolve(`${src}?astro-client-directive=${directive}`).then(value => {
+				return `<script type="module" src="${value}"></script>`;
+			});
+		}
+		case 'inline': {
+			throw new Error(`Inline not yet supported`);
+		}
+	}
+}
+
+function isPromise<T>(value: any): value is Promise<T> {
+	if(typeof value.then === 'function') {
+		return true;
+	}
+	return false;
+}
+
+export function getPrescripts(result: SSRResult, type: PrescriptType, directive: string): string | Promise<string> {
 	// Note that this is a classic script, not a module script.
 	// This is so that it executes immediate, and when the browser encounters
 	// an astro-island element the callbacks will fire immediately, causing the JS
 	// deps to be loaded immediately.
 	switch (type) {
 		case 'both':
-			return `<style>astro-island,astro-slot{display:contents}</style><script>${
-				getDirectiveScriptText(directive) + islandScript
-			}</script>`;
+			let directiveScript = getDirectiveScript(result, directive);
+			if(isPromise<string>(directiveScript)) {
+				return directiveScript.then(scriptText => {
+					return `${ISLAND_STYLES}${scriptText}<script>${islandScript}</script>`;
+				});
+			}
+			return `${ISLAND_STYLES}${directiveScript}<script>${islandScript}</script>`
 		case 'directive':
-			return `<script>${getDirectiveScriptText(directive)}</script>`;
+			return getDirectiveScript(result, directive);
 	}
 	return '';
 }

packages/astro/src/vite-plugin-client-directive/index.ts

@@ -0,0 +1,34 @@
+import type * as vite from 'vite';
+import type { AstroConfig, ManifestData } from '../@types/astro';
+import { error, info, LogOptions, warn } from '../core/logger/core.js';
+
+interface AstroPluginOptions {
+	config: AstroConfig;
+	logging: LogOptions;
+}
+
+export default function createPlugin({ config, logging }: AstroPluginOptions): vite.Plugin {
+	return {
+		name: 'astro:client-directive',
+		transform(code, id, opts = {}) {
+			let idx = id.indexOf('?astro-client-directive');
+			if(idx !== -1) {
+				let entrypoint = id.slice(0, idx);
+				let params = new URLSearchParams(id.slice(idx));
+				let directive = params.get('astro-client-directive');
+				return `
+import directive from '${entrypoint}';
+
+(self.Astro = self.Astro || {}).${directive} = directive;
+window.dispatchEvent(new Event('astro:${directive}'));
+`.trim()
+			}
+
+			/*if (opts.ssr) return;
+			if (!id.includes('vite/dist/client/client.mjs')) return;
+			return code
+				.replace(/\.tip \{[^}]*\}/gm, '.tip {\n  display: none;\n}')
+				.replace(/\[vite\]/g, '[astro]');*/
+		},
+	};
+}