diff --git a/packages/jaamd/package.json b/packages/jaamd/package.json
index 87d5300..8e06c37 100644
--- a/packages/jaamd/package.json
+++ b/packages/jaamd/package.json
@@ -35,7 +35,10 @@
     "./styles.css": "./src/styles/markdown.css",
     "./shiki-dual": "./src/styles/shiki-dual.css",
     "./shiki-dual.css": "./src/styles/shiki-dual.css",
-    "./themes": "./src/themes/index.ts",
+    "./themes": {
+      "types": "./src/themes/index.d.ts",
+      "default": "./src/themes/index.js"
+    },
     "./themes/*/dark.css": "./src/themes/*/dark.css",
     "./themes/*/dark": "./src/themes/*/dark.css",
     "./themes/*.css": "./src/themes/*/index.css",
diff --git a/packages/jaamd/src/themes/index.d.ts b/packages/jaamd/src/themes/index.d.ts
new file mode 100644
index 0000000..9a1fa48
--- /dev/null
+++ b/packages/jaamd/src/themes/index.d.ts
@@ -0,0 +1,20 @@
+/**
+ * `light` and `dark` are single palettes that apply in both modes; `dual` carries
+ * both, a `:root` block and an `html.dark` one, and follows whatever decides the
+ * mode. A `dual` theme has no `/dark` variant — its own file already does that.
+ */
+export type JaamdThemeMode = "light" | "dark" | "dual";
+
+export interface JaamdTheme {
+  /** Directory name, and the value a `data-jaamd-theme` attribute would carry. */
+  slug: string;
+  /** Human-readable name, for pickers. */
+  name: string;
+  mode: JaamdThemeMode;
+  /** Shiki theme that pairs with this palette, or a pair for a `dual` one. */
+  shiki: string | { light: string; dark: string };
+}
+
+export declare const themes: JaamdTheme[];
+
+export declare const REQUIRED_TOKENS: string[];
diff --git a/packages/jaamd/src/themes/index.ts b/packages/jaamd/src/themes/index.js
similarity index 60%
rename from packages/jaamd/src/themes/index.ts
rename to packages/jaamd/src/themes/index.js
index 03e0fab..8c49347 100644
--- a/packages/jaamd/src/themes/index.ts
+++ b/packages/jaamd/src/themes/index.js
@@ -1,27 +1,15 @@
-/*
- * Theme manifest. Consumers build pickers from this instead of hardcoding a
- * list; `tests/unit/themes.mjs` checks each entry against a directory that
- * honours the token contract.
- */
-
 /**
- * `light` and `dark` are single palettes applying in both modes. `dual` carries
- * both a `:root` block and an `html.dark` one, and follows the mode; it has no
- * `/dark` variant.
+ * What every theme declares about itself. Consumers build theme pickers from
+ * this instead of hardcoding a list, and `tests/unit/themes.mjs` checks that
+ * each entry matches a directory that honours the token contract.
+ *
+ * Plain JavaScript on purpose: Node refuses to strip types from files under
+ * node_modules, so a TypeScript manifest would be readable by bundlers and by
+ * nothing else — tooling and test runners included. Types live in index.d.ts.
  */
-export type JaamdThemeMode = "light" | "dark" | "dual";
 
-export interface JaamdTheme {
-  /** Directory name, and the value a `data-jaamd-theme` attribute would carry. */
-  slug: string;
-  /** Human-readable name, for pickers. */
-  name: string;
-  mode: JaamdThemeMode;
-  /** Shiki theme that pairs with this palette, or a pair for a `dual` one. */
-  shiki: string | { light: string; dark: string };
-}
-
-export const themes: JaamdTheme[] = [
+/** @type {import("./index.d.ts").JaamdTheme[]} */
+export const themes = [
   {
     slug: "catppuccin",
     name: "Catppuccin",
@@ -63,4 +51,4 @@ export const REQUIRED_TOKENS = [
   "--jaamd-alert-important-color",
   "--jaamd-alert-warning-color",
   "--jaamd-alert-caution-color",
-] as const;
+];
diff --git a/scripts/build-themes.mjs b/scripts/build-themes.mjs
index f737fe2..6f9260e 100644
--- a/scripts/build-themes.mjs
+++ b/scripts/build-themes.mjs
@@ -10,7 +10,7 @@ import { readdirSync, readFileSync, writeFileSync, rmSync, existsSync } from "no
 import { join } from "node:path";
 import { fileURLToPath } from "node:url";
 
-import { themes } from "../packages/jaamd/src/themes/index.ts";
+import { themes } from "../packages/jaamd/src/themes/index.js";
 
 const THEMES = join(process.cwd(), "packages", "jaamd", "src", "themes");
 
diff --git a/tests/build/smoke.mjs b/tests/build/smoke.mjs
index b661769..5ddbf92 100644
--- a/tests/build/smoke.mjs
+++ b/tests/build/smoke.mjs
@@ -7,7 +7,7 @@
 import { readFileSync, existsSync } from "node:fs";
 import { join } from "node:path";
 
-import { themes } from "../../packages/jaamd/src/themes/index.ts";
+import { themes } from "../../packages/jaamd/src/themes/index.js";
 
 const DIST = join(process.cwd(), "www", "dist");
 const PAGE = join(DIST, "index.html");
diff --git a/tests/unit/themes.mjs b/tests/unit/themes.mjs
index 36c8ad2..3971531 100644
--- a/tests/unit/themes.mjs
+++ b/tests/unit/themes.mjs
@@ -8,7 +8,7 @@ import { readdirSync, readFileSync, existsSync } from "node:fs";
 import { join } from "node:path";
 import { bundledThemes } from "shiki";
 
-import { themes, REQUIRED_TOKENS } from "../../packages/jaamd/src/themes/index.ts";
+import { themes, REQUIRED_TOKENS } from "../../packages/jaamd/src/themes/index.js";
 import { darkVariant } from "../../scripts/build-themes.mjs";
 
 const THEMES = join(process.cwd(), "packages", "jaamd", "src", "themes");
@@ -30,7 +30,7 @@ for (const slug of slugs) {
   check(
     `${slug}: declared in the manifest`,
     entry,
-    "add it to packages/jaamd/src/themes/index.ts, or pickers will never show it",
+    "add it to packages/jaamd/src/themes/index.js, or pickers will never show it",
   );
   if (!entry) continue;