breaking: disallow state mutations in logic block expression #13625
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🦋 Changeset detectedLatest commit: 266b645 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Rich-Harris
approved these changes
Oct 16, 2024
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The problem of mutations in logic block expressions has come up a dozen or so times now, the latest is #13446. The common one is sorting in the expression:
{#each items.sort() as item (item)} <p>{item}</p> {/each}This PR changes it so block effects behave a bit like deriveds and forbid state mutations. This in turn will help developers find issues in their applications quickly by hitting the error about unsafe mutations rather than too many updates error message which is harder to track down.