Add API documentation as llm.txt

Author: nojaf

.gitignore

@@ -3,4 +3,5 @@
 .bsb.lock
 .astro
 dist/
-tmp/
+tmp/
+docs/public/llm.txt

astro.config.mjs

@@ -77,6 +77,14 @@ export default defineConfig({
             ...apiSidebarItems,
           ],
         },
+        {
+          label: "LLM Documentation",
+          link: "./llm.txt",
+          badge: {
+            text: "New",
+            variant: "tip",
+          },
+        },
       ],
       customCss: ["./docs/styles/fonts.css", "./docs/styles/theme.css"],
       expressiveCode: {

docs/llm.js

@@ -0,0 +1,117 @@
+import * as path from "node:path";
+import { exec } from "node:child_process";
+import { promisify } from "node:util";
+import fs from "node:fs/promises";
+
+const execAsync = promisify(exec);
+
+const bins = await import(
+    path.join(import.meta.dirname, "../node_modules/rescript/cli/common/bins.js")
+);
+const rescriptTools = bins["rescript_tools_exe"];
+
+if (!rescriptTools) {
+    throw new Error("rescript-tools not found");
+}
+
+async function getDocJson(filePath) {
+    try {
+        const command = `${rescriptTools} doc "${filePath}"`;
+        const options = { maxBuffer: 10 * 1024 * 1024 };
+        const { stdout, stderr } = await execAsync(command, options);
+
+        if (stderr) {
+            throw new Error(`Error executing command for ${filePath}: ${stderr}`);
+        }
+
+        return JSON.parse(stdout);
+    } catch (error) {
+        throw new Error(`Failed to get documentation JSON for ${filePath}:`, error);
+    }
+}
+
+async function processFile(filePath) {
+    const json = await getDocJson(filePath);
+
+    const moduleName = "WebAPI." + json.name.replace("-WebAPI", "");
+
+    const types = [];
+    const functions = [];
+
+    function mkType(item) {
+        let description = "";
+        if (item.docstrings.length > 0) {
+            description = "\n  Description: " + item.docstrings.join("\n");
+        }
+        let fields = "";
+        if (item.detail && item.detail.kind === "record") {
+            fields =
+                "\n  Fields:\n" +
+                item.detail.items
+                    .map((field) => {
+                        let fieldDoc = "";
+                        if (field.docstrings.length > 0) {
+                            fieldDoc = " - " + field.docstrings.join(" ");
+                        }
+                        return `  - ${field.name}: ${field.signature}${fieldDoc}`;
+                    })
+                    .join("\n");
+        }
+        return `- ${item.signature}${description}${fields}`;
+    }
+
+    function mkFunction(item) {
+        let description = "";
+        if (item.docstrings.length > 0) {
+            description = "\n  Description: " + item.docstrings.join("\n");
+        }
+        return `- ${item.signature}${description}`;
+    }
+
+    for (const item of json.items) {
+        switch (item.kind) {
+            case "type":
+                types.push(mkType(item));
+                break;
+            case "value":
+                functions.push(mkFunction(item));
+                break;
+        }
+    }
+
+    let typeString = "";
+    if (types.length > 0) {
+        typeString = "\n\nTypes:\n\n" + types.join("\n\n");
+    }
+
+    let functionString = "";
+    if (functions.length > 0) {
+        functionString = "\n\nFunctions:\n\n" + functions.join("\n\n");
+    }
+
+    return `File: ${json.source.filepath}
+Module: ${moduleName}${typeString}${functionString}
+`;
+}
+
+const pattern = "../src/**/*.res"
+const files = [];
+for await (const file of  fs.glob(pattern, { recursive: true, cwd: import.meta.dirname })) {
+    files.push(path.join(import.meta.dirname, file));
+}
+files.sort();
+
+const pages = await Promise.all(files.map(processFile))
+const packageJson = await fs.readFile(path.join(import.meta.dirname, "../package.json"), "utf-8");
+let version = JSON.parse(packageJson).version;
+const sha = await execAsync("git rev-parse --short HEAD").then(({ stdout }) => stdout.trim());
+const fullVersion = `${version}-${sha}`;
+const header = `Experimental Rescript WebAPI Documentation ${fullVersion}
+
+This is the API documentation for the experimental WebAPI module version ${fullVersion}.
+More information can be found on https://rescript-lang.github.io/experimental-rescript-webapi/
+
+`
+const content = pages.join("\n---\n\n");
+await fs.writeFile(path.join(import.meta.dirname, "public/llm.txt"), header + content);
+console.log("Generated llm.txt");

package.json

@@ -31,6 +31,7 @@
     "build": "rescript",
     "format": "rescript format -all && prettier --write ./tests/index.js ./package.json ./docs/pages",
     "docs": "astro dev",
+    "pre:build:docs": "node docs/llm.js",
     "build:docs": "astro build"
   },
   "license": "MIT",