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

98.86% Statements 174/176
97.43% Branches 38/39
100% Functions 5/5
98.83% Lines 169/171

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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 1722x 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 2x 29990x 29990x 29990x 29990x 29990x 29990x 29990x 29990x 2x 2x 2x 2x 2x 2x 2x 2x 21343x 21343x 21343x 21343x 21343x 21343x 15922x 15922x 21343x 21343x 21343x 2x 2x 2x 2x 2x 2x 2x 782x 782x 782x 782x 782x 782x 2x 2x 2x 2x 2x 2x 2x 2x 24624x     24624x 24624x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 21308x 141x 21308x 99x 14x 14x 99x 85x 77x 85x 8x 8x 85x 99x 21308x 21308x 21308x 22x 22x 21308x 21308x 21308x 21308x 24624x 24624x 24624x 2x 2x 2x 2x 2x 2x 27725x 27725x 27725x 20977x 20977x 20977x 20977x 27716x 25506x 25506x 25506x 25506x 25506x 24120x 24120x 25506x 24010x 24010x 25506x 23x 23x 23x 23987x 23987x 23987x 23987x 25501x 23144x 6417x 23025x 16727x 16727x 23144x 25506x 27725x  
/** @import { Derived, Effect, Source, Value } from '#client' */
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 {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 {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 {Value<V>} source
 * @param {V} value
 */
export function mutate(source, value) {
	set(
		source,
		untrack(() => get(source))
	);
	return value;
}
 
/**
 * @template V
 * @param {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 {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 {Derived} */ (reaction), MAYBE_DIRTY);
			} else {
				schedule_effect(/** @type {Effect} */ (reaction));
			}
		}
	}
}