website_next: part 3

website_next/wallets/read.js

@@ -0,0 +1,28 @@
+/** @param {unknown} value */
+export function readObject(value) {
+  return value && typeof value === "object"
+    ? /** @type {Record<string, unknown>} */ (value)
+    : undefined;
+}
+
+/** @param {unknown} value */
+export function readNumber(value) {
+  return typeof value === "number" && Number.isFinite(value)
+    ? value
+    : undefined;
+}
+
+/** @param {unknown} value */
+export function readString(value) {
+  return typeof value === "string" ? value : undefined;
+}
+
+/**
+ * @param {unknown} value
+ * @param {string} key
+ */
+export function readArray(value, key) {
+  const array = readObject(value)?.[key];
+
+  return Array.isArray(array) ? array : [];
+}