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This is always `\n * true` for fungible assets.\n * @property iconUrl - The URL of the asset's icon, which can be a base64 SVG or a remote HTTPS URL.\n * @property units - An array of units for the asset, each represented by {@link FungibleAssetUnitStruct}.\n */\nexport const FungibleAssetMetadataStruct = object({\n name: optional(string()),\n symbol: optional(string()),\n fungible: literal(true),\n iconUrl: AssetIconUrlStruct,\n units: size(array(FungibleAssetUnitStruct), 1, Infinity),\n});\n\n/**\n * A collection of non-fungible assets, which can be used to group\n * assets that share a common theme or creator.\n *\n * @property name - The name of the collection.\n * @property address - The CAIP-10 account ID of the collection's creator.\n * @property symbol - The symbol of the collection.\n * @property tokenCount - The number of tokens in the collection, if available.\n * @property creator - The CAIP-10 account ID of the collection's creator, if\n * available.\n * @property imageUrl - The URL of the collection's image.\n */\nexport const NonFungibleAssetCollectionStruct = object({\n name: string(),\n address: CaipAccountIdStruct,\n symbol: string(),\n tokenCount: optional(number()),\n creator: optional(CaipAccountIdStruct),\n imageUrl: optional(AssetIconUrlStruct),\n});\n\n/**\n * A collection of non-fungible assets, which can be used to group\n * assets that share a common theme or creator.\n *\n * @property name - The name of the collection.\n * @property address - The CAIP-10 account ID of the collection's creator.\n * @property symbol - The symbol of the collection.\n * @property tokenCount - The number of tokens in the collection, if available.\n * @property creator - The CAIP-10 account ID of the collection's creator, if\n * available.\n * @property imageUrl - The URL of the collection's image.\n */\nexport type NonFungibleAssetCollection = Infer<\n typeof NonFungibleAssetCollectionStruct\n>;\n\n/**\n * A struct representing the metadata for a non-fungible asset.\n *\n * @property fungible - Indicates that this is a non-fungible asset.\n * This is always `false` for non-fungible assets.\n * @property name - The name of the asset, if available.\n * @property symbol - The symbol of the asset, if available.\n * @property imageUrl - The URL of the asset's image, which can be a base64 SVG or a remote HTTPS URL.\n * @property description - A description of the asset, if available.\n * @property acquiredAt - The timestamp when the asset was acquired, if available.\n * @property isPossibleSpam - Indicates if the asset is possibly spam, if available.\n * @property attributes - Additional attributes of the asset, represented as a record of string keys and\n * string or number values.\n * @property collection - The collection the asset belongs to, if available. See {@link NonFungibleAssetCollectionStruct}.\n */\nexport const NonFungibleAssetMetadataStruct = object({\n fungible: literal(false),\n name: optional(string()),\n symbol: optional(string()),\n imageUrl: optional(AssetIconUrlStruct),\n description: optional(string()),\n acquiredAt: optional(number()),\n isPossibleSpam: optional(boolean()),\n attributes: optional(record(string(), union([string(), number()]))),\n collection: optional(NonFungibleAssetCollectionStruct),\n});\n\n/**\n * A struct representing the metadata for an asset, which can be either\n * {@link FungibleAssetMetadataStruct} or {@link NonFungibleAssetMetadataStruct}.\n */\nexport const AssetMetadataStruct = selectiveUnion((metadata) => {\n if (isObject(metadata) && metadata.fungible) {\n return FungibleAssetMetadataStruct;\n }\n\n return NonFungibleAssetMetadataStruct;\n});\n\n/**\n * A struct representing the response of the `onAssetsLookup` method.\n *\n * @property assets - An object containing a mapping between the CAIP-19 key and a metadata object or null.\n */\nexport const OnAssetsLookupResponseStruct = object({\n assets: record(CaipAssetTypeOrIdStruct, nullable(AssetMetadataStruct)),\n});\n\n/**\n * The metadata for an asset, which can be either fungible or non-fungible.\n *\n */\nexport type AssetMetadata = Infer;\n\n/**\n * The metadata for a fungible asset.\n *\n * @property fungible - Indicates that this is a fungible asset.\n * This is always `true` for fungible assets.\n * @property name - The name of the asset.\n * @property symbol - The symbol of the asset.\n * @property iconUrl - The URL of the asset's icon.\n * @property units - An array of units for the asset, each represented by {@link FungibleAssetUnit}.\n */\nexport type FungibleAssetMetadata = Infer;\n\n/**\n * The metadata for a non-fungible asset.\n *\n * @property fungible - Indicates that this is a non-fungible asset.\n * This is always `false` for non-fungible assets.\n * @property name - The name of the asset.\n * @property symbol - The symbol of the asset.\n * @property imageUrl - The URL of the asset's image.\n * @property description - A description of the asset.\n * @property acquiredAt - The timestamp when the asset was acquired, if available.\n * @property isPossibleSpam - Indicates if the asset is possibly spam, if available.\n * @property attributes - Additional attributes of the asset, represented as a record of string keys and\n * string or number values.\n * @property collection - The collection the asset belongs to, if available. See {@link NonFungibleAssetCollection}.\n */\nexport type NonFungibleAssetMetadata = Infer<\n typeof NonFungibleAssetMetadataStruct\n>;\n\n/**\n * The arguments for the `onAssetsLookup` handler.\n *\n * @property assets - An array of CAIP-19 asset types to look up.\n */\nexport type OnAssetsLookupArguments = {\n assets: CaipAssetTypeOrId[];\n};\n\n/**\n * The `onAssetsLookup` handler. This is called by MetaMask when querying about specific assets on specific chains.\n *\n * @returns The metadata about each asset. See\n * {@link OnAssetsLookupResponse}.\n */\nexport type OnAssetsLookupHandler = (\n args: OnAssetsLookupArguments,\n) => Promise;\n\n/**\n * The response from the query, containing metadata about each requested asset.\n *\n * @property assets - An object containing a mapping between the CAIP-19 key and a metadata object or null.\n */\nexport type OnAssetsLookupResponse = {\n assets: Record;\n};\n"]}