is_prop_source() — svelte Function Reference

Architecture documentation for the is_prop_source() function in utils.js from the svelte codebase.

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Compiler→ Transformer→ is_prop_source() — svelte Function Reference

Dependency Diagram

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Relationship Graph

Source Code

packages/svelte/src/compiler/phases/3-transform/client/utils.js lines 116–127

export function is_prop_source(binding, state) {
	return (
		(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
		(!state.analysis.runes ||
			state.analysis.accessors ||
			binding.reassigned ||
			binding.initial ||
			// Until legacy mode is gone, we also need to use the prop source when only mutated is true,
			// because the parent could be a legacy component which needs coarse-grained reactivity
			binding.updated)
	);
}