2 files changed, 47 insertions, 0 deletions
diff --git a/op_crates/web/00_webidl.js b/op_crates/web/00_webidl.js
index ab3047391..c00c605e8 100644
--- a/op_crates/web/00_webidl.js
+++ b/op_crates/web/00_webidl.js
@@ -596,6 +596,13 @@
 
   converters.VoidFunction = convertCallbackFunction;
 
+  converters["UVString?"] = createNullableConverter(
+    converters.USVString,
+  );
+  converters["sequence<double>"] = createSequenceConverter(
+    converters["double"],
+  );
+
   function requiredArguments(length, required, opts = {}) {
     if (length < required) {
       const errMsg = `${
@@ -737,6 +744,26 @@
     };
   }
 
+  function createRecordConverter(keyConverter, valueConverter) {
+    return (V, opts) => {
+      if (typeof V !== "object") {
+        throw makeException(
+          TypeError,
+          "can not be converted to dictionary.",
+          opts,
+        );
+      }
+      const result = {};
+      for (const key of V) {
+        const typedKey = keyConverter(key, opts);
+        const value = V[key];
+        const typedValue = valueConverter(value, opts);
+        result[typedKey] = typedValue;
+      }
+      return result;
+    };
+  }
+
   const brand = Symbol("[[webidl.brand]]");
 
   function createInterfaceConverter(name, prototype) {
@@ -766,12 +793,14 @@
 
   window.__bootstrap ??= {};
   window.__bootstrap.webidl = {
+    makeException,
     converters,
     requiredArguments,
     createDictionaryConverter,
     createEnumConverter,
     createNullableConverter,
     createSequenceConverter,
+    createRecordConverter,
     createInterfaceConverter,
     brand,
     createBranded,
diff --git a/op_crates/web/internal.d.ts b/op_crates/web/internal.d.ts
index 8be80c8a5..efafee26c 100644
--- a/op_crates/web/internal.d.ts
+++ b/op_crates/web/internal.d.ts
@@ -25,6 +25,11 @@ declare namespace globalThis {
          */
         context: string;
       }
+      declare function makeException(
+        ErrorType: any,
+        message: string,
+        opts: ValueConverterOpts,
+      ): any;
       declare interface IntConverterOpts extends ValueConverterOpts {
         /**
          * Wether to throw if the number is outside of the acceptable values for
@@ -191,6 +196,8 @@ declare namespace globalThis {
          * Convert a value into a `VoidFunction` (() => void).
          */
         VoidFunction(v: any, opts?: ValueConverterOpts): () => void;
+        ["UVString?"](v: any, opts?: ValueConverterOpts): string | null;
+        ["sequence<double>"](v: any, opts?: ValueConverterOpts): number[];
 
         [type: string]: (v: any, opts: ValueConverterOpts) => any;
       };
@@ -268,6 +275,17 @@ declare namespace globalThis {
         name: string,
         prototype: any,
       ): (v: any, opts: ValueConverterOpts) => any;
+
+      declare function createRecordConverter<
+        K extends string | number | symbol,
+        V,
+      >(
+        keyConverter: (v: any, opts: ValueConverterOpts) => K,
+        valueConverter: (v: any, opts: ValueConverterOpts) => V,
+      ): (
+        v: Record<K, V>,
+        opts: ValueConverterOpts,
+      ) => any;
     }
 
     declare var eventTarget: {