store on energy and all resource structures

This is probably a more novice question on typescript. How do you deal with a variable that could be a structure like spawn or storage.

Sample code (if available)

    private test(struct: AnyStoreStructure, resource: ResourceConstant) {
        const used = struct.store.getUsedCapacity(resource)
    }

I get this error due to a structure can be an extension which has a store of Store<RESOURCE_ENERGY, false>; and storage which has a store of type StoreDefinition = Store<ResourceConstant, false>

I am getting this error with the above code. I am unsure how to allow this the proper way?

[!] (plugin rpt2) Error: D:/programs/screeps-ts-restart/src/departments/shipping.ts(64,39): semantic error TS2349: This expression is not callable.
  Each member of the union type '(<R extends "energy" | "power" | "ops" | "U" | "L" | "K" | "Z" | "O" | "H" | "X" | "OH" | "ZK" | "UL" | "G" | "UH" | "UO" | "KH" | "KO" | "LH" | "LO" | "ZH" | "ZO" | "GH" | "GO" | "UH2O" | "UHO2" | ... 58 more ... | undefined = undefined>(resource?: R | undefined) => R extends undefined ? null : R extends "energy" ?...' has signatures, but none of those signatures are compatible with each other.
src\departments\shipping.ts
Error: D:/programs/screeps-ts-restart/src/departments/shipping.ts(64,39): semantic error TS2349: This expression is not callable.
  Each member of the union type '(<R extends "energy" | "power" | "ops" | "U" | "L" | "K" | "Z" | "O" | "H" | "X" | "OH" | "ZK" | "UL" | "G" | "UH" | "UO" | "KH" | "KO" | "LH" | "LO" | "ZH" | "ZO" | "GH" | "GO" | "UH2O" | "UHO2" | ... 58 more ... | undefined = undefined>(resource?: R | undefined) => R extends undefined ? null : R extends "energy" ?...' has signatures, but none of those signatures are compatible with each other.

Your Environment

• “@types/screeps”: “^3.1.0”,

[pyrodogg]

@adamtaylor13 Correct. There are certain structures which have stores that can contain any type of resource (ex. Container, Terminal) and then there are structures which have restricted stores (ex. Tower only takes energy). With the current type definitions there just isn’t enough info for the compiler to tell which is which if you have them in a mixed array. Also unfortunately it’s not smart enough to realize energy may be in both sets.

Casting the store as a GenericStore, as you’ve done is the generally acknowledged workaround. The other solution would be to first narrow down the structure types into compatible storage. For example, a switch statement testing structure.StructureType where each case captures a set of structures with compatible storage, or do it all 1:1. By testing on structure.structureType TS should be able to identify the type of the structure, and therefore the type of storage.

Screeps is a fun game, and learning TS is a worthy challenge but don’t let the structured nature of it stop you from enjoying the game. If something is really getting you stuck, see if casting it to something (like the generic store type), or worst case as any will allow you to keep things moving. Especially since adding 3rd party types to something we can’t control can leave a few rough edges.

I highly recommend anyone wanting to play Screeps with TypeScript to join #typescript on the official Discord (recently moved from Slack) https://twitter.com/ScreepsGame/status/1419919747437764612 There is a great community there for TS, other languages, and the game overall.

@pbrink231 @rudykocur Sorry for not getting you this feedback sooner.

[Pr0metheus42]

I suggest updating the ts version and consider this issue “fixed”. Assuming that is the cause.