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 30064x 30064x 30064x 30064x 30064x 30064x 30064x 30064x 2x 2x 2x 2x 2x 2x 2x 2x 21348x 21348x 21348x 21348x 21348x 21348x 15906x 15906x 21348x 21348x 21348x 2x 2x 2x 2x 2x 2x 2x 782x 782x 782x 782x 782x 782x 2x 2x 2x 2x 2x 2x 2x 2x 24210x     24210x 24210x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 20866x 141x 20866x 99x 14x 14x 99x 85x 77x 85x 8x 8x 85x 99x 20866x 20866x 20866x 22x 22x 20866x 20866x 20866x 20866x 24210x 24210x 24210x 2x 2x 2x 2x 2x 2x 27136x 27136x 27136x 20366x 20366x 20366x 20366x 27135x 24825x 24825x 24825x 24825x 24825x 23451x 23451x 24825x 23341x 23341x 24825x 23x 23x 23x 23318x 23318x 23318x 23318x 24820x 22551x 6270x 22432x 16281x 16281x 22551x 24825x 27136x  
/** @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));
			}
		}
	}
}