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

98.85% Statements 173/175
97.43% Branches 38/39
100% Functions 5/5
98.82% Lines 168/170

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 1712x 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 2x 2x 2x 2x 2x 2x 2x 29813x 29813x 29813x 29813x 29813x 29813x 29813x 29813x 2x 2x 2x 2x 2x 2x 2x 2x 21206x 21206x 21206x 21206x 21206x 21206x 15807x 15807x 21206x 21206x 21206x 2x 2x 2x 2x 2x 2x 2x 780x 780x 780x 780x 780x 780x 2x 2x 2x 2x 2x 2x 2x 2x 24066x     24066x 24066x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 20744x 141x 20744x 105x 14x 14x 105x 91x 83x 91x 8x 8x 91x 105x 20744x 20744x 20744x 22x 22x 20744x 20744x 20744x 20744x 24066x 24066x 24066x 2x 2x 2x 2x 2x 2x 27120x 27120x 27120x 20404x 20404x 20404x 20404x 27111x 24914x 24914x 24914x 24914x 24914x 23572x 23572x 24914x 23468x 23468x 24914x 23x 23x 23x 23445x 23445x 23445x 23445x 24909x 22606x 6376x 22487x 16230x 16230x 22606x 24914x 27120x  
import { DEV } from 'esm-env';
import {
	current_component_context,
	current_reaction,
	new_deps,
	current_effect,
	current_untracked_writes,
	get,
	is_runes,
	schedule_effect,
	set_current_untracked_writes,
	set_signal_status,
	untrack,
	increment_version,
	update_effect
} from '../runtime.js';
import { equals, safe_equals } from './equality.js';
import {
	CLEAN,
	DERIVED,
	DIRTY,
	BRANCH_EFFECT,
	INSPECT_EFFECT,
	UNOWNED,
	MAYBE_DIRTY
} from '../constants.js';
import * as e from '../errors.js';
 
let inspect_effects = new Set();
 
/**
 * @template V
 * @param {V} v
 * @returns {import('#client').Source<V>}
 */
/*#__NO_SIDE_EFFECTS__*/
export function source(v) {
	return {
		f: 0, // TODO ideally we could skip this altogether, but it causes type errors
		v,
		reactions: null,
		equals,
		version: 0
	};
}
 
/**
 * @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>} source
 * @param {V} value
 * @returns {V}
 */
export function set(source, value) {
	if (current_reaction !== null && is_runes() && (current_reaction.f & DERIVED) !== 0) {
		e.state_unsafe_mutation();
	}
 
	if (!source.equals(value)) {
		source.v = value;
		source.version = increment_version();
 
		mark_reactions(source, DIRTY);
 
		// 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++)`
		if (
			is_runes() &&
			current_effect !== null &&
			(current_effect.f & CLEAN) !== 0 &&
			(current_effect.f & BRANCH_EFFECT) === 0
		) {
			if (new_deps !== null && new_deps.includes(source)) {
				set_signal_status(current_effect, DIRTY);
				schedule_effect(current_effect);
			} else {
				if (current_untracked_writes === null) {
					set_current_untracked_writes([source]);
				} else {
					current_untracked_writes.push(source);
				}
			}
		}
 
		if (DEV) {
			for (const effect of inspect_effects) {
				update_effect(effect);
			}
 
			inspect_effects.clear();
		}
	}
 
	return value;
}
 
/**
 * @param {import('#client').Value} signal
 * @param {number} status should be DIRTY or MAYBE_DIRTY
 * @returns {void}
 */
function mark_reactions(signal, status) {
	var reactions = signal.reactions;
	if (reactions === null) return;
 
	var runes = is_runes();
	var length = reactions.length;
 
	for (var i = 0; i < length; i++) {
		var reaction = reactions[i];
		var flags = reaction.f;
 
		// Skip any effects that are already dirty
		if ((flags & DIRTY) !== 0) continue;
 
		// In legacy mode, skip the current effect to prevent infinite loops
		if (!runes && reaction === current_effect) continue;
 
		// Inspect effects need to run immediately, so that the stack trace makes sense
		if (DEV && (flags & INSPECT_EFFECT) !== 0) {
			inspect_effects.add(reaction);
			continue;
		}
 
		set_signal_status(reaction, status);
 
		// If the signal a) was previously clean or b) is an unowned derived, then mark it
		if ((flags & (CLEAN | UNOWNED)) !== 0) {
			if ((flags & DERIVED) !== 0) {
				mark_reactions(/** @type {import('#client').Derived} */ (reaction), MAYBE_DIRTY);
			} else {
				schedule_effect(/** @type {import('#client').Effect} */ (reaction));
			}
		}
	}
}