All files / src/internal/client/reactivity sources.js

98.66% Statements 148/150
96.15% Branches 25/26
100% Functions 4/4
98.61% Lines 142/144

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 1452x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 36536x 2x 2x 2x 2x 2x 2x 2x 2x 23251x 23251x 23251x 23251x 23251x 23251x 17889x 17889x 23251x 23251x 23251x 2x 2x 2x 2x 2x 2x 2x 758x 758x 758x 758x 758x 758x 2x 2x 2x 2x 2x 2x 2x 2x 24249x 24249x 24249x 24249x 24249x 24249x 24249x 1155x 24249x     24249x 24249x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 21007x 1209x 21007x 1191x 12x 12x 1191x 1179x 1169x 1179x 10x 10x 1179x 1191x 21007x 21007x 21007x 21007x 21007x 443x 21007x 20564x 20564x 21007x 21007x 24249x 24249x 24249x  
import { DEV } from 'esm-env';
import {
	current_component_context,
	current_reaction,
	current_dependencies,
	current_effect,
	current_untracked_writes,
	current_untracking,
	get,
	is_batching_effect,
	is_runes,
	mark_reactions,
	schedule_effect,
	set_current_untracked_writes,
	set_last_inspected_signal,
	set_signal_status,
	untrack
} from '../runtime.js';
import { equals, safe_equals } from './equality.js';
import { CLEAN, DERIVED, DIRTY, BRANCH_EFFECT } from '../constants.js';
import { UNINITIALIZED } from '../../../constants.js';
import * as e from '../errors.js';
 
/**
 * @template V
 * @param {V} value
 * @returns {import('#client').Source<V>}
 */
/*#__NO_SIDE_EFFECTS__*/
export function source(value) {
	/** @type {import('#client').Source<V>} */
	const source = {
		f: 0, // TODO ideally we could skip this altogether, but it causes type errors
		reactions: null,
		equals: equals,
		v: value,
		version: 0
	};
 
	if (DEV) {
		/** @type {import('#client').ValueDebug<V>} */ (source).inspect = new Set();
	}
 
	return source;
}
 
/**
 * @template V
 * @param {V} initial_value
 * @returns {import('#client').Source<V>}
 */
/*#__NO_SIDE_EFFECTS__*/
export function mutable_source(initial_value) {
	const s = source(initial_value);
	s.equals = safe_equals;
 
	// bind the signal to the component context, in case we need to
	// track updates to trigger beforeUpdate/afterUpdate callbacks
	if (current_component_context !== null && current_component_context.l !== null) {
		(current_component_context.l.s ??= []).push(s);
	}
 
	return s;
}
 
/**
 * @template V
 * @param {import('#client').Value<V>} source
 * @param {V} value
 */
export function mutate(source, value) {
	set(
		source,
		untrack(() => get(source))
	);
	return value;
}
 
/**
 * @template V
 * @param {import('#client').Source<V>} signal
 * @param {V} value
 * @returns {V}
 */
export function set(signal, value) {
	var initialized = signal.v !== UNINITIALIZED;
 
	if (
		!current_untracking &&
		initialized &&
		current_reaction !== null &&
		is_runes() &&
		(current_reaction.f & DERIVED) !== 0
	) {
		e.state_unsafe_mutation();
	}
 
	if (!signal.equals(value)) {
		signal.v = value;
 
		// Increment write version so that unowned signals can properly track dirtiness
		signal.version++;
 
		// If the current signal is running for the first time, it won't have any
		// reactions as we only allocate and assign the reactions after the signal
		// has fully executed. So in the case of ensuring it registers the reaction
		// properly for itself, we need to ensure the current effect actually gets
		// scheduled. i.e:
		//
		// $effect(() => x++)
		//
		// We additionally want to skip this logic when initialising store sources
		if (
			is_runes() &&
			initialized &&
			current_effect !== null &&
			(current_effect.f & CLEAN) !== 0 &&
			(current_effect.f & BRANCH_EFFECT) === 0
		) {
			if (current_dependencies !== null && current_dependencies.includes(signal)) {
				set_signal_status(current_effect, DIRTY);
				schedule_effect(current_effect);
			} else {
				if (current_untracked_writes === null) {
					set_current_untracked_writes([signal]);
				} else {
					current_untracked_writes.push(signal);
				}
			}
		}
 
		mark_reactions(signal, DIRTY, true);
 
		if (DEV) {
			if (is_batching_effect) {
				set_last_inspected_signal(/** @type {import('#client').ValueDebug} */ (signal));
			} else {
				for (const fn of /** @type {import('#client').ValueDebug} */ (signal).inspect) fn();
			}
		}
	}
 
	return value;
}