[Docs Site] various typescript improvements (cloudflare#18006)

* fix: various typescript improvements

* fix: mdxTextExpression comparison

.github/workflows/ci.yml

@@ -37,6 +37,8 @@ jobs:
           NODE_OPTIONS: "--max-old-space-size=4192"
           RUN_LINK_CHECK: true
 
+      - run: npm run check:worker
+
       - uses: actions/cache/save@v4
         with:
           path: |

.prettierrc.mjs

@@ -1,3 +1,4 @@
+// @ts-check
 /** @type {import("prettier").Config} */
 export default {
 	plugins: ["prettier-plugin-astro"],

ec.config.mjs

@@ -1,3 +1,4 @@
+// @ts-check
 import darkTheme from "solarflare-theme/themes/cloudflare-dark-color-theme.json" with { type: "json" };
 import lightTheme from "solarflare-theme/themes/cloudflare-light-color-theme.json" with { type: "json" };
 
@@ -6,6 +7,9 @@ import { h } from "@expressive-code/core/hast";
 
 import lzstring from "lz-string";
 
+/**
+ * @param {string} code
+ */
 export function serialiseWorker(code) {
 	const formData = new FormData();
 
@@ -29,6 +33,9 @@ export function serialiseWorker(code) {
 	return formData;
 }
 
+/**
+ * @param {FormData} worker
+ */
 export async function compressWorker(worker) {
 	const serialisedWorker = new Response(worker);
 	return lzstring.compressToEncodedURIComponent(
@@ -92,7 +99,10 @@ function outputCodeblocks() {
 			},
 			postprocessRenderedBlock: async (context) => {
 				if (!context.codeBlock.meta.includes("output")) return;
-				context.renderData.blockAst.properties.className.push("code-output");
+				context.renderData.blockAst.properties.className ??= [];
+				if (Array.isArray(context.renderData.blockAst.properties.className)) {
+					context.renderData.blockAst.properties.className.push("code-output");
+				}
 				context.addStyles(`
 					div.expressive-code:has(figure.code-output) {
 						margin-top: 0 !important;

package.json

@@ -10,6 +10,7 @@
 		"check": "npm run check:functions && npm run check:astro",
 		"check:astro": "npm run sync && astro check",
 		"check:functions": "npx tsc --noEmit -p ./functions/tsconfig.json",
+		"check:worker": "npx tsc --noEmit -p ./worker/tsconfig.json",
 		"dev": "npx astro dev",
 		"format": "npx prettier --write \"**/*.{js,jsx,ts,tsx,mjs,astro,css,json,yaml,yml}\"",
 		"postinstall": "npx patch-package && npm run sync",
@@ -35,6 +36,7 @@
 		"@codingheads/sticky-header": "^1.0.2",
 		"@stoplight/json-schema-tree": "^4.0.0",
 		"@types/dompurify": "^3.0.5",
+		"@types/hast": "^3.0.4",
 		"@types/he": "^1.2.3",
 		"@types/node": "^22.8.7",
 		"@types/react": "^18.3.12",
@@ -56,6 +58,7 @@
 		"instantsearch.js": "^4.75.4",
 		"lz-string": "^1.5.0",
 		"marked": "^14.1.3",
+		"mdast-util-mdx-expression": "^2.0.1",
 		"mermaid": "^11.4.0",
 		"node-html-parser": "^6.1.13",
 		"patch-package": "^8.0.0",
@@ -83,7 +86,7 @@
 		"typescript": "^5.6.3",
 		"unist-util-visit": "^5.0.0",
 		"vitest": "2.1.4",
-		"wrangler": "^3.78.10",
+		"wrangler": "^3.84.1",
 		"yaml": "^2.6.0"
 	},
 	"engines": {

plugins/rehype/heading-slugs.ts

@@ -1,32 +1,37 @@
 import { toString } from "hast-util-to-string";
 import { visit } from "unist-util-visit";
 import GithubSlugger from "github-slugger";
+import type { Root } from "hast";
+import type { MdxTextExpression } from "mdast-util-mdx-expression";
 
 const slugs = new GithubSlugger();
 
 // # foo {/*bar*/} = <a id="bar">foo</a>
 export default function () {
-	return function (tree: any) {
+	return function (tree: Root) {
 		slugs.reset();
 
-		visit(tree, "element", function (element: any) {
+		visit(tree, "element", function (element) {
 			if (/^h[1-6]$/.test(element.tagName)) {
 				const last = element.children.at(-1);
 
-				if (
-					last.type === "mdxTextExpression" &&
-					last.value.startsWith("/*") &&
-					last.value.endsWith("*/")
-				) {
-					const id = last.value.slice(2, -2).trim();
-					element.properties.id = slugs.slug(id);
+				// @ts-expect-error this is added by mdast-util-mdx-expression
+				if (last.type === "mdxTextExpression") {
+					const lastElement = last as MdxTextExpression;
+					if (
+						lastElement.value.startsWith("/*") &&
+						lastElement.value.endsWith("*/")
+					) {
+						const id = lastElement.value.slice(2, -2).trim();
+						element.properties.id = slugs.slug(id);
 
-					const text = element.children.at(-2);
-					text.value = text.value.trimEnd();
-					element.children.with(-2, text);
-				} else {
-					if (!element.properties.id) {
-						element.properties.id = slugs.slug(toString(element));
+						const text = element.children.at(-2) as MdxTextExpression;
+						text.value = text.value.trimEnd();
+						element.children.with(-2, text);
+					} else {
+						if (!element.properties.id) {
+							element.properties.id = slugs.slug(toString(element));
+						}
 					}
 				}
 			}

tailwind.config.mjs

@@ -1,3 +1,4 @@
+// @ts-check
 import starlightPlugin from "@astrojs/starlight-tailwind";
 
 const gray = {

worker/index.ts

@@ -23,6 +23,7 @@ export default class extends WorkerEntrypoint<Env> {
 			}
 
 			try {
+				// @ts-expect-error Ignore Fetcher type mismatch
 				const redirect = await redirectsEvaluator(request, this.env.ASSETS);
 				if (redirect) {
 					return redirect;
@@ -38,6 +39,7 @@ export default class extends WorkerEntrypoint<Env> {
 				);
 				const redirect = await redirectsEvaluator(
 					new Request(forceTrailingSlashURL, request),
+					// @ts-expect-error Ignore Fetcher type mismatch
 					this.env.ASSETS,
 				);
 				if (redirect) {