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Merge pull request #2695 from sveltejs/gh-2644

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use safe_not_equal logic for derived stores
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Rich Harris 2019-05-06 06:57:10 -04:00 committed by GitHub
commit 4962e20aa2
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2 changed files with 24 additions and 1 deletions
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2
store.mjs
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@ -55,7 +55,7 @@ export function derived(stores, fn, initial_value) {
const sync = () => {
if (pending) return;
const result = fn(single ? values[0] : values, set);
if (auto && (value !== (value = result))) set(result);
if (auto) set(result);
};
const unsubscribers = stores.map((store, i) => store.subscribe(

23
test/store/index.js
View File

@ -188,6 +188,29 @@ describe('store', () => {
unsubscribe();
});
it('is updated with safe_not_equal logic', () => {
const arr = [0];
const number = writable(1);
const numbers = derived(number, $number => {
arr[0] = $number;
return arr;
});
const concatenated = [];
const unsubscribe = numbers.subscribe(value => {
concatenated.push(...value);
});
number.set(2);
number.set(3);
assert.deepEqual(concatenated, [1, 2, 3]);
unsubscribe();
});
});
describe('get', () => {