update_pre() — svelte Function Reference

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

Function javascript ClientRuntime Reactivity calls 2

Entity Profile

ClientRuntime→ Reactivity→ update_pre() — svelte Function Reference

Dependency Diagram

graph TD
  63c330bd_031b_834f_7605_9e5d742444d2["update_pre()"]
  e5c35d51_28d8_9054_923d_b7f82a3c8dc2["sources.js"]
  63c330bd_031b_834f_7605_9e5d742444d2 -->|defined in| e5c35d51_28d8_9054_923d_b7f82a3c8dc2
  a08b6cc5_af73_1be4_d02f_3113cf8a8305["get()"]
  63c330bd_031b_834f_7605_9e5d742444d2 -->|calls| a08b6cc5_af73_1be4_d02f_3113cf8a8305
  63ee8247_ada4_9f1d_e139_0c1167cd5b1c["set()"]
  63c330bd_031b_834f_7605_9e5d742444d2 -->|calls| 63ee8247_ada4_9f1d_e139_0c1167cd5b1c
  style 63c330bd_031b_834f_7605_9e5d742444d2 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/internal/client/reactivity/sources.js lines 301–307

export function update_pre(source, d = 1) {
	var value = get(source);

	// @ts-expect-error
	// eslint-disable-next-line no-useless-assignment -- `++`/`--` used for return value, not side effect on `value`
	return set(source, d === 1 ? ++value : --value);
}