state_unsafe_mutation() — svelte Function Reference

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

Function javascript ClientRuntime Hydration called by 1

Entity Profile

ClientRuntime→ Hydration→ state_unsafe_mutation() — svelte Function Reference

Dependency Diagram

graph TD
  445b20fc_7497_089a_6986_38e05859055b["state_unsafe_mutation()"]
  ff387d97_d6d2_81e0_e731_656552709d27["errors.js"]
  445b20fc_7497_089a_6986_38e05859055b -->|defined in| ff387d97_d6d2_81e0_e731_656552709d27
  63ee8247_ada4_9f1d_e139_0c1167cd5b1c["set()"]
  63ee8247_ada4_9f1d_e139_0c1167cd5b1c -->|calls| 445b20fc_7497_089a_6986_38e05859055b
  style 445b20fc_7497_089a_6986_38e05859055b fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/internal/client/errors.js lines 465–475

export function state_unsafe_mutation() {
	if (DEV) {
		const error = new Error(`state_unsafe_mutation\nUpdating state inside \`$derived(...)\`, \`$inspect(...)\` or a template expression is forbidden. If the value should not be reactive, declare it without \`$state\`\nhttps://svelte.dev/e/state_unsafe_mutation`);

		error.name = 'Svelte error';

		throw error;
	} else {
		throw new Error(`https://svelte.dev/e/state_unsafe_mutation`);
	}
}