deep_read() — svelte Function Reference

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

Function javascript ClientRuntime Hydration called by 1

Entity Profile

ClientRuntime→ Hydration→ deep_read() — svelte Function Reference

Dependency Diagram

graph TD
  6df34f9a_c0f2_3a71_c389_07a149b321f6["deep_read()"]
  bde4209f_8ffc_1594_4024_b1835a44bcf6["runtime.js"]
  6df34f9a_c0f2_3a71_c389_07a149b321f6 -->|defined in| bde4209f_8ffc_1594_4024_b1835a44bcf6
  14da5ffa_bc19_aee6_36b3_bbba24db7f02["deep_read_state()"]
  14da5ffa_bc19_aee6_36b3_bbba24db7f02 -->|calls| 6df34f9a_c0f2_3a71_c389_07a149b321f6
  style 6df34f9a_c0f2_3a71_c389_07a149b321f6 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/internal/client/runtime.js lines 801–843

export function deep_read(value, visited = new Set()) {
	if (
		typeof value === 'object' &&
		value !== null &&
		// We don't want to traverse DOM elements
		!(value instanceof EventTarget) &&
		!visited.has(value)
	) {
		visited.add(value);
		// When working with a possible SvelteDate, this
		// will ensure we capture changes to it.
		if (value instanceof Date) {
			value.getTime();
		}
		for (let key in value) {
			try {
				deep_read(value[key], visited);
			} catch (e) {
				// continue
			}
		}
		const proto = get_prototype_of(value);
		if (
			proto !== Object.prototype &&
			proto !== Array.prototype &&
			proto !== Map.prototype &&
			proto !== Set.prototype &&
			proto !== Date.prototype
		) {
			const descriptors = get_descriptors(proto);
			for (let key in descriptors) {
				const get = descriptors[key].get;
				if (get) {
					try {
						get.call(value);
					} catch (e) {
						// continue
					}
				}
			}
		}
	}
}