node_modules/mongodb/mongodb.d.ts(5233,89): error TS2344: Type 'Flatten<TSchema[key]>' does not satisfy the constraint '{ _id?: any; }'.
  Type 'unknown' is not assignable to type '{ _id?: any; }'.
    Type 'Flatten<TSchema[KeysOfAType<TSchema, readonly any[] | undefined>]>' is not assignable to type '{ _id?: any; }'.
      Type 'unknown' is not assignable to type '{ _id?: any; }'.
        Type 'Flatten<TSchema[NonNullable<TSchema[keyof TSchema]> extends readonly any[] | undefined ? keyof TSchema : never]>' is not assignable to type '{ _id?: any; }'.
          Type 'unknown' is not assignable to type '{ _id?: any; }'.
            Type 'Flatten<TSchema[keyof TSchema]>' is not assignable to type '{ _id?: any; }'.
              Type 'unknown' is not assignable to type '{ _id?: any; }'.
                Type 'Flatten<TSchema[string | number | symbol]>' is not assignable to type '{ _id?: any; }'.
                  Type 'Flatten<TSchema[string]> | Flatten<TSchema[number]> | Flatten<TSchema[symbol]>' is not assignable to type '{ _id?: any; }'.
                    Type 'Flatten<TSchema[string]>' is not assignable to type '{ _id?: any; }'.
node_modules/mongodb/mongodb.d.ts(5233,149): error TS2344: Type 'Flatten<TSchema[key]>' does not satisfy the constraint '{ _id?: any; }'.

mkdir mongo-tsc && cd mongo-tsc && npm init -y
npm install mongodb typescript@4.5.0-beta
echo 'import("mongodb")' > index.ts
node_modules/.bin/tsc --strict index.ts