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import { DEV } from 'esm-env';
import { CLEAN, DERIVED, DESTROYED, DIRTY, MAYBE_DIRTY, UNOWNED } from '../constants.js';
import {
current_reaction,
current_effect,
remove_reactions,
set_signal_status,
current_skip_reaction,
update_reaction,
destroy_effect_children,
increment_version
} from '../runtime.js';
import { equals, safe_equals } from './equality.js';
import * as e from '../errors.js';
export let updating_derived = false;
/**
* @template V
* @param {() => V} fn
* @returns {Derived<V>}
*/
/*#__NO_SIDE_EFFECTS__*/
export function derived(fn) {
let flags = DERIVED | DIRTY;
if (current_effect === null) flags |= UNOWNED;
/** @type {Derived<V>} */
const signal = {
deps: null,
deriveds: null,
equals,
f: flags,
first: null,
fn,
last: null,
reactions: null,
v: /** @type {V} */ (null),
version: 0
};
if (current_reaction !== null && (current_reaction.f & DERIVED) !== 0) {
var current_derived = /** @type {Derived} */ (current_reaction);
if (current_derived.deriveds === null) {
current_derived.deriveds = [signal];
} else {
current_derived.deriveds.push(signal);
}
}
return signal;
}
/**
* @template V
* @param {() => V} fn
* @returns {Derived<V>}
*/
/*#__NO_SIDE_EFFECTS__*/
export function derived_safe_equal(fn) {
const signal = derived(fn);
signal.equals = safe_equals;
return signal;
}
/**
* @param {Derived} derived
* @returns {void}
*/
function destroy_derived_children(derived) {
destroy_effect_children(derived);
var deriveds = derived.deriveds;
if (deriveds !== null) {
derived.deriveds = null;
for (var i = 0; i < deriveds.length; i += 1) {
destroy_derived(deriveds[i]);
}
}
}
/**
* The currently updating deriveds, used to detect infinite recursion
* in dev mode and provide a nicer error than 'too much recursion'
* @type {Derived[]}
*/
let stack = [];
/**
* @param {Derived} derived
* @returns {void}
*/
export function update_derived(derived) {
if (DEV) {
if (stack.includes(derived)) {
e.derived_references_self();
}
stack.push(derived);
}
var previous_updating_derived = updating_derived;
updating_derived = true;
destroy_derived_children(derived);
var value = update_reaction(derived);
updating_derived = previous_updating_derived;
if (DEV) {
stack.pop();
}
var status =
(current_skip_reaction || (derived.f & UNOWNED) !== 0) && derived.deps !== null
? MAYBE_DIRTY
: CLEAN;
set_signal_status(derived, status);
if (!derived.equals(value)) {
derived.v = value;
derived.version = increment_version();
}
}
/**
* @param {Derived} signal
* @returns {void}
*/
export function destroy_derived(signal) {
destroy_derived_children(signal);
remove_reactions(signal, 0);
set_signal_status(signal, DESTROYED);
// TODO we need to ensure we remove the derived from any parent derives
signal.first =
signal.last =
signal.deps =
signal.reactions =
// @ts-expect-error `signal.fn` cannot be `null` while the signal is alive
signal.fn =
null;
}
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