8 replies

Handling Type Mismatch with Branded IDs in TypeScript

Hey all, I have a a schema and am using a branded ID:

export const AssetId = S.String.pipe(S.brand("AssetId"));
const CoreAsset = S.Struct({
  id: AssetId,
  name: AssetName,
  ...Metadata.fields,
});

export class Asset extends S.Class<Asset>("Asset")({
  ...CoreAsset.fields,
}) {}

export const AssetId = S.String.pipe(S.brand("AssetId"));
const CoreAsset = S.Struct({
  id: AssetId,
  name: AssetName,
  ...Metadata.fields,
});

export class Asset extends S.Class<Asset>("Asset")({
  ...CoreAsset.fields,
}) {}

export const AssetId = S.String.pipe(S.brand("AssetId"));
const CoreAsset = S.Struct({
  id: AssetId,
  name: AssetName,
  ...Metadata.fields,
});

export class Asset extends S.Class<Asset>("Asset")({
  ...CoreAsset.fields,
}) {}

export const AssetId = S.String.pipe(S.brand("AssetId"));
const CoreAsset = S.Struct({
  id: AssetId,
  name: AssetName,
  ...Metadata.fields,
});

export class Asset extends S.Class<Asset>("Asset")({
  ...CoreAsset.fields,
}) {}

I am querying my database using the TS Drizzle library which returns a typescript type of the database table. The returned string is NOT a branded AssetId.

return new Asset(assetReturnedFromDrizzle);

return new Asset(assetReturnedFromDrizzle);

return new Asset(assetReturnedFromDrizzle);

return new Asset(assetReturnedFromDrizzle); However it throws the "string is not type of AssetId" which makes sense.

What is the proper way to handle this scenario?

Handling Type Mismatch with Branded IDs in TypeScript

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