what should i do to make derived variables in svelte?

Use a derived store:

export const custom_items = writable([]);
export const another_items = writable([]);

const get_total = items => items.flat().map(x => x.amount).reduce((t, x) => t + x, 0)
export const total = derived(
  [custom_items, another_items], // deps
  items => get_total(items)      // [...values] => derived_value

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