can_hoist_snippet() — svelte Function Reference

Architecture documentation for the can_hoist_snippet() function in SnippetBlock.js from the svelte codebase.

Function javascript Compiler Transformer called by 1

Entity Profile

Compiler→ Transformer→ can_hoist_snippet() — svelte Function Reference

Dependency Diagram

graph TD
  4fe2860f_6c10_b43a_a4dd_aec81cdcaaa2["can_hoist_snippet()"]
  e0442a00_296c_5b68_2228_3e947a4a5278["SnippetBlock.js"]
  4fe2860f_6c10_b43a_a4dd_aec81cdcaaa2 -->|defined in| e0442a00_296c_5b68_2228_3e947a4a5278
  170735b0_d19f_e8fe_cdc9_07ad2d5b7b3a["SnippetBlock()"]
  170735b0_d19f_e8fe_cdc9_07ad2d5b7b3a -->|calls| 4fe2860f_6c10_b43a_a4dd_aec81cdcaaa2
  style 4fe2860f_6c10_b43a_a4dd_aec81cdcaaa2 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/compiler/phases/2-analyze/visitors/SnippetBlock.js lines 81–113

function can_hoist_snippet(scope, scopes, visited = new Set()) {
	for (const [reference] of scope.references) {
		const binding = scope.get(reference);
		if (!binding) continue;

		if (binding.blocker) {
			return false;
		}

		if (binding.scope.function_depth === 0) {
			continue;
		}

		// ignore bindings declared inside the snippet (e.g. the snippet's own parameters)
		if (binding.scope.function_depth >= scope.function_depth) {
			continue;
		}

		if (binding.initial?.type === 'SnippetBlock') {
			if (visited.has(binding)) continue;
			visited.add(binding);
			const snippet_scope = /** @type {Scope} */ (scopes.get(binding.initial));

			if (can_hoist_snippet(snippet_scope, scopes, visited)) {
				continue;
			}
		}

		return false;
	}

	return true;
}