local error impl: errors shown fixed position that are wiped when moved from the view

1 files changed, 24 insertions, 2 deletions

diff --git a/packages/taler-util/src/payto.ts b/packages/taler-util/src/payto.ts
index 85870afcd..3df174944 100644
--- a/packages/taler-util/src/payto.ts
+++ b/packages/taler-util/src/payto.ts
@@ -15,6 +15,7 @@
  */
 
 import { generateFakeSegwitAddress } from "./bitcoin.js";
+import { Codec, Context, DecodingError, renderContext } from "./codec.js";
 import { URLSearchParams } from "./url.js";
 
 export type PaytoUri =
@@ -23,6 +24,27 @@ export type PaytoUri =
   | PaytoUriTalerBank
   | PaytoUriBitcoin;
 
+declare const __payto_str: unique symbol;
+export type PaytoString = string & { [__payto_str]: true };
+
+export function codecForPaytoString(): Codec<PaytoString> {
+  return {
+    decode(x: any, c?: Context): PaytoString {
+      if (typeof x !== "string") {
+        throw new DecodingError(
+          `expected string at ${renderContext(c)} but got ${typeof x}`,
+        );
+      }
+      if (!x.startsWith(paytoPfx)) {
+        throw new DecodingError(
+          `expected start with payto at ${renderContext(c)} but got "${x}"`,
+        );
+      }
+      return x as PaytoString;
+    },
+  };
+}
+
 export interface PaytoUriGeneric {
   targetType: PaytoType | string;
   targetPath: string;
@@ -143,13 +165,13 @@ export function addPaytoQueryParams(
  * @param p
  * @returns
  */
-export function stringifyPaytoUri(p: PaytoUri): string {
+export function stringifyPaytoUri(p: PaytoUri): PaytoString {
   const url = new URL(`${paytoPfx}${p.targetType}/${p.targetPath}`);
   const paramList = !p.params ? [] : Object.entries(p.params);
   paramList.forEach(([key, value]) => {
     url.searchParams.set(key, value);
   });
-  return url.href;
+  return url.href as PaytoString;
 }
 
 /**