get_prop_source() — svelte Function Reference

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

Function javascript Compiler Transformer calls 1 called by 1

Entity Profile

Compiler→ Transformer→ get_prop_source() — svelte Function Reference

Dependency Diagram

graph TD
  5f0f3809_9fa1_84c1_24be_92d8863f2fb1["get_prop_source()"]
  c518b20b_2355_7b11_4ac2_2d9bb5dcfb43["utils.js"]
  5f0f3809_9fa1_84c1_24be_92d8863f2fb1 -->|defined in| c518b20b_2355_7b11_4ac2_2d9bb5dcfb43
  dbadea0c_9bb0_dd96_41bd_09a33169352f["VariableDeclaration()"]
  dbadea0c_9bb0_dd96_41bd_09a33169352f -->|calls| 5f0f3809_9fa1_84c1_24be_92d8863f2fb1
  0eb6598b_73c2_c88f_86a0_12cef2210ad8["is_simple_expression()"]
  5f0f3809_9fa1_84c1_24be_92d8863f2fb1 -->|calls| 0eb6598b_73c2_c88f_86a0_12cef2210ad8
  style 5f0f3809_9fa1_84c1_24be_92d8863f2fb1 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/compiler/phases/3-transform/client/utils.js lines 53–108

export function get_prop_source(binding, state, name, initial) {
	/** @type {Expression[]} */
	const args = [b.id('$$props'), b.literal(name)];

	let flags = 0;

	if (binding.kind === 'bindable_prop') {
		flags |= PROPS_IS_BINDABLE;
	}

	if (state.analysis.immutable) {
		flags |= PROPS_IS_IMMUTABLE;
	}

	if (state.analysis.runes) {
		flags |= PROPS_IS_RUNES;
	}

	if (
		state.analysis.accessors ||
		(state.analysis.immutable
			? binding.reassigned || (state.analysis.runes && binding.mutated)
			: binding.updated)
	) {
		flags |= PROPS_IS_UPDATED;
	}

	/** @type {Expression | undefined} */
	let arg;

	if (initial) {
		// To avoid eagerly evaluating the right-hand-side, we wrap it in a thunk if necessary
		if (is_simple_expression(initial)) {
			arg = initial;
		} else {
			if (
				initial.type === 'CallExpression' &&
				initial.callee.type === 'Identifier' &&
				initial.arguments.length === 0
			) {
				arg = initial.callee;
			} else {
				arg = b.thunk(initial);
			}

			flags |= PROPS_IS_LAZY_INITIAL;
		}
	}

	if (flags || arg) {
		args.push(b.literal(flags));
		if (arg) args.push(arg);
	}

	return b.call('$.prop', ...args);
}