Fix iOS markdown image rendering

packages/app/src/utils/markdown-ast.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest";
+import { markdownNodeContainsType } from "./markdown-ast";
+
+describe("markdownNodeContainsType", () => {
+  it("matches the node itself", () => {
+    expect(markdownNodeContainsType({ type: "image", children: [] }, "image")).toBe(true);
+  });
+
+  it("matches descendants", () => {
+    const paragraph = {
+      type: "paragraph",
+      children: [
+        { type: "text", children: [] },
+        {
+          type: "link",
+          children: [{ type: "image", children: [] }],
+        },
+      ],
+    };
+
+    expect(markdownNodeContainsType(paragraph, "image")).toBe(true);
+  });
+
+  it("returns false when the type is absent", () => {
+    const paragraph = {
+      type: "paragraph",
+      children: [
+        { type: "text", children: [] },
+        { type: "strong", children: [{ type: "text", children: [] }] },
+      ],
+    };
+
+    expect(markdownNodeContainsType(paragraph, "image")).toBe(false);
+  });
+});

packages/app/src/utils/markdown-ast.ts

@@ -0,0 +1,12 @@
+export interface MarkdownAstNodeWithChildren {
+  type: string;
+  children: MarkdownAstNodeWithChildren[];
+}
+
+export function markdownNodeContainsType(node: MarkdownAstNodeWithChildren, type: string): boolean {
+  if (node.type === type) {
+    return true;
+  }
+
+  return node.children.some((child) => markdownNodeContainsType(child, type));
+}