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UpdateExpression() — svelte Function Reference

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

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Entity Profile

Dependency Diagram

graph TD
  2cb72050_ed51_5c99_e47c_168f11167daa["UpdateExpression()"]
  f04c39ca_0e0e_c579_b84f_1250f25711ac["UpdateExpression.js"]
  2cb72050_ed51_5c99_e47c_168f11167daa -->|defined in| f04c39ca_0e0e_c579_b84f_1250f25711ac
  style 2cb72050_ed51_5c99_e47c_168f11167daa fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

packages/svelte/src/compiler/phases/3-transform/server/visitors/UpdateExpression.js lines 9–26

export function UpdateExpression(node, context) {
	const argument = node.argument;

	if (
		argument.type === 'Identifier' &&
		context.state.scope.get(argument.name)?.kind === 'store_sub'
	) {
		return b.call(
			node.prefix ? '$.update_store_pre' : '$.update_store',
			b.assignment('??=', b.id('$$store_subs'), b.object([])),
			b.literal(argument.name),
			b.id(argument.name.slice(1)),
			node.operator === '--' && b.literal(-1)
		);
	}

	return context.next();
}

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Defined In

Source

Frequently Asked Questions

What does UpdateExpression() do?
UpdateExpression() is a function in the svelte codebase, defined in packages/svelte/src/compiler/phases/3-transform/server/visitors/UpdateExpression.js.
Where is UpdateExpression() defined?
UpdateExpression() is defined in packages/svelte/src/compiler/phases/3-transform/server/visitors/UpdateExpression.js at line 9.

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