Tweak generics

packages/ui/src/AssetSelector/AssetSelectorDialogContent/index.tsx

@@ -45,23 +45,25 @@ const OptionsWrapper = styled.div`
   gap: ${props => props.theme.spacing(1)};
 `;
 
-export interface AssetSelectorDialogContentProps<IncludesBalancesResponses extends boolean> {
+export interface AssetSelectorDialogContentProps<
+  ValueType extends (BalancesResponse | Metadata) | Metadata,
+> {
   title: string;
   layoutId: string;
-  value?: IncludesBalancesResponses extends true ? BalancesResponse | Metadata : Metadata;
-  onChange: (
-    value: IncludesBalancesResponses extends true ? BalancesResponse | Metadata : Metadata,
-  ) => void;
-  options: IncludesBalancesResponses extends true ? (BalancesResponse | Metadata)[] : Metadata[];
+  value?: ValueType;
+  onChange: (value: ValueType) => void;
+  options: ValueType[];
 }
 
-export const AssetSelectorDialogContent = <IncludesBalancesResponses extends boolean>({
+export const AssetSelectorDialogContent = <
+  ValueType extends (BalancesResponse | Metadata) | Metadata,
+>({
   title,
   layoutId,
   value,
   onChange,
   options,
-}: AssetSelectorDialogContentProps<IncludesBalancesResponses>) => {
+}: AssetSelectorDialogContentProps<ValueType>) => {
   const [search, setSearch] = useState('');
   const filteredOptions = useMemo(
     () => options.filter(filterMetadataOrBalancesResponseByText(search)),

packages/ui/src/AssetSelector/index.stories.tsx

@@ -4,6 +4,7 @@ import { useArgs } from '@storybook/preview-api';
 import { AssetSelector } from '.';
 import { AssetId, Metadata } from '@penumbra-zone/protobuf/penumbra/core/asset/v1/asset_pb';
 import { BalancesResponse } from '@penumbra-zone/protobuf/penumbra/view/v1/view_pb';
+import { useState } from 'react';
 
 const u8 = (length: number) => Uint8Array.from({ length }, () => Math.floor(Math.random() * 256));
 
@@ -113,7 +114,8 @@ const umBalance1 = new BalancesResponse({
   },
 });
 
-const options = [pizza, umBalance0, umBalance1, osmoBalance0];
+const mixedOptions: (BalancesResponse | Metadata)[] = [pizza, umBalance0, umBalance1, osmoBalance0];
+const metadataOnlyOptions: Metadata[] = [pizza, um, osmo];
 
 const meta: Meta<typeof AssetSelector> = {
   component: AssetSelector,
@@ -127,11 +129,11 @@ export default meta;
 
 type Story = StoryObj<typeof AssetSelector>;
 
-export const Basic: Story = {
+export const MixedBalancesResponsesAndMetadata: Story = {
   args: {
     dialogTitle: 'Transfer Assets',
     value: umBalance0,
-    options,
+    options: mixedOptions,
   },
 
   render: function Render(props) {
@@ -142,3 +144,18 @@ export const Basic: Story = {
     return <AssetSelector {...props} onChange={onChange} />;
   },
 };
+
+export const MetadataOnly: Story = {
+  render: function Render() {
+    const [value, setValue] = useState<Metadata>(um);
+
+    return (
+      <AssetSelector
+        dialogTitle='Transfer Assets'
+        value={value}
+        options={metadataOnlyOptions}
+        onChange={setValue}
+      />
+    );
+  },
+};

packages/ui/src/AssetSelector/index.tsx

@@ -30,37 +30,35 @@ const Row = styled.div<{ $density: Density }>`
   align-items: center;
 `;
 
-export interface AssetSelectorProps<IncludesBalancesResponses extends boolean> {
+export interface AssetSelectorProps<ValueType extends (BalancesResponse | Metadata) | Metadata> {
   /**
    * The currently selected `Metadata` or `BalancesResponse`.
    */
-  value?: IncludesBalancesResponses extends true ? BalancesResponse | Metadata : Metadata;
-  onChange: (
-    value: IncludesBalancesResponses extends true ? BalancesResponse | Metadata : Metadata,
-  ) => void;
+  value?: ValueType;
+  onChange: (value: ValueType) => void;
   /**
    * An array of `Metadata`s and possibly `BalancesResponse`s to render as
    * options. If `BalancesResponse`s are included in the `options` array, those
    * options will be rendered with the user's balance of them.
    */
-  options: IncludesBalancesResponses extends true ? (BalancesResponse | Metadata)[] : Metadata[];
+  options: ValueType[];
   /** The title to show above the asset selector dialog when it opens. */
   dialogTitle: string;
 }
 
-export const AssetSelector = <IncludesBalancesResponses extends boolean>({
+export const AssetSelector = <ValueType extends (BalancesResponse | Metadata) | Metadata>({
   value,
   onChange,
   options,
   dialogTitle,
-}: AssetSelectorProps<IncludesBalancesResponses>) => {
+}: AssetSelectorProps<ValueType>) => {
   const layoutId = useId();
   const density = useDensity();
   const metadata = isMetadata(value) ? value : getMetadataFromBalancesResponse.optional()(value);
 
   const [isOpen, setIsOpen] = useState(false);
 
-  const handleChange = (newValue: typeof value) => {
+  const handleChange = (newValue: ValueType) => {
     onChange(newValue);
     setIsOpen(false);
   };