Expose ExtractTableAlias type to allow for higher order queries

[zaalbarxx]

Hi!
Recently I was working on some project which uses Kysely and repository pattern for calling database. Here I've created some "common" query functions.

The problem can be seen here:
https://stackblitz.com/edit/typescript-bgfy14?file=index.ts,common.ts,package.json,tsconfig.json

If you look at common.ts there is an getAllWhere method which Typescript is complaining with. Here TS is trying to compare signatures and says that

Type 'ExpressionBuilder<DB, ExtractTableAlias<DB, TableName>>' is not assignable to type 'ExpressionBuilder<DB, TableName>'

I guess that's how TS works and it cannot properly assume that TableName extends keyof DB & string is actually always a table name without alias so later on it tries to infer aliased table name with ExtractTableAlias (and obviously falls back to the same value/string, because TableName cannot have alias). So it would be helpful if I could do something like:

getAllWhere<
      T extends SimpleReferenceExpression<DB, TableName>,
      VE extends OperandValueExpressionOrList<DB, ExtractTableAlias<DB, TableName>, T>,
      QE extends ExpressionOrFactory<DB, ExtractTableAlias<DB, TableName>, SqlBool> // <=== **ExtractTableAlias** used
    >(
      clauses: [T, ComparisonOperatorExpression, VE][] | QE
    ): Promise<Selectable<Entity>[]>

Of course I could do

const query = connection.selectFrom(tableName) as QueryBuilder<DB, TableName, {}>

, or just "steal" this ExtractTableAlias type and put it inside the project, but I think that's not optimal.
Maybe there is some other way to correctly type this thing so I would be grateful for some guidance, but looking at the exposed types I cannot really see a way to do it right.

Cheers