Value Type — svelte Architecture

Source Code

packages/svelte/src/internal/client/reactivity/types.d.ts lines 18–42

export interface Value<V = unknown> extends Signal {
	/** Equality function */
	equals: Equals;
	/** Signals that read from this signal */
	reactions: null | Reaction[];
	/** Read version */
	rv: number;
	/** The latest value for this signal */
	v: V;

	// dev-only
	/** A label (e.g. the `foo` in `let foo = $state(...)`) used for `$inspect.trace()` */
	label?: string;
	/** An error with a stack trace showing when the source was created */
	created?: Error | null;
	/** An map of errors with stack traces showing when the source was updated, keyed by the stack trace */
	updated?: Map<string, { error: Error; count: number }> | null;
	/**
	 * Whether or not the source was set while running an effect — if so, we need to
	 * increment the write version so that it shows up as dirty when the effect re-runs
	 */
	set_during_effect?: boolean;
	/** A function that retrieves the underlying source, used for each block item signals */
	trace?: null | (() => void);
}