diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..c554e15
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,52 @@
+export type AnyNode = any;
+
+/** Mount a Solid tree into a NativeScript host element. Returns a disposer. */
+export function render(code: () => any, element: AnyNode): () => void;
+
+/** Create a reactive effect. */
+export function effect<T>(fn: (prev?: T) => T, init?: T): void;
+
+/** Create a memoized computation. */
+export function memo<T>(fn: () => T, equal?: boolean): () => T;
+
+/** Create a component instance. */
+export function createComponent<P>(Comp: (props: P) => any, props: P): any;
+
+/** Create an element node by tag name. */
+export function createElement(tagName: string): AnyNode;
+
+/** Create a text node. */
+export function createTextNode(value: string): AnyNode;
+
+/** Insert a raw node into a parent before an optional anchor. */
+export function insertNode(parent: AnyNode, node: AnyNode, anchor?: AnyNode | null): void;
+
+/** Insert reactive content into a parent before an optional marker. */
+export function insert(
+  parent: AnyNode,
+  accessor: any,
+  marker?: AnyNode | null,
+  initial?: any
+): AnyNode;
+
+/** Spread props onto a node. */
+export function spread(
+  node: AnyNode,
+  props: Record<string, any>,
+  isSVG?: boolean,
+  skipChildren?: boolean
+): AnyNode;
+
+/** Set a single prop on a node. */
+export function setProp(node: AnyNode, name: string, value: any, prev?: any): void;
+
+/** Merge props objects similarly to Solid's mergeProps. */
+export function mergeProps<T extends object, U extends object>(
+  ...sources: Array<Partial<T> | Partial<U> | undefined>
+): T & U;
+
+/** Optional helper to call a function if provided, returning its result. */
+export function use<TArgs, TReturn>(
+  fn: ((args: TArgs) => TReturn) | undefined,
+  args: TArgs
+): TReturn | undefined;