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@ -8,12 +8,11 @@ import {
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PROPS_IS_UPDATED
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PROPS_IS_UPDATED
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} from '../../../constants.js';
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} from '../../../constants.js';
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import { get_descriptor, is_function } from '../../shared/utils.js';
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import { get_descriptor, is_function } from '../../shared/utils.js';
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import { mutable_source, set, source, update } from './sources.js';
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import { set, source, update } from './sources.js';
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import { derived, derived_safe_equal } from './deriveds.js';
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import { derived, derived_safe_equal } from './deriveds.js';
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import { get, captured_signals, untrack } from '../runtime.js';
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import { get, untrack } from '../runtime.js';
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import { safe_equals } from './equality.js';
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import * as e from '../errors.js';
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import * as e from '../errors.js';
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import { LEGACY_DERIVED_PROP, LEGACY_PROPS, STATE_SYMBOL } from '#client/constants';
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import { LEGACY_PROPS, STATE_SYMBOL } from '#client/constants';
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import { proxy } from '../proxy.js';
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import { proxy } from '../proxy.js';
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import { capture_store_binding } from './store.js';
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import { capture_store_binding } from './store.js';
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import { legacy_mode_flag } from '../../flags/index.js';
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import { legacy_mode_flag } from '../../flags/index.js';
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@ -260,89 +259,92 @@ function has_destroyed_component_ctx(current_value) {
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* @returns {(() => V | ((arg: V) => V) | ((arg: V, mutation: boolean) => V))}
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* @returns {(() => V | ((arg: V) => V) | ((arg: V, mutation: boolean) => V))}
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*/
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*/
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export function prop(props, key, flags, fallback) {
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export function prop(props, key, flags, fallback) {
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var immutable = (flags & PROPS_IS_IMMUTABLE) !== 0;
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var runes = !legacy_mode_flag || (flags & PROPS_IS_RUNES) !== 0;
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var runes = !legacy_mode_flag || (flags & PROPS_IS_RUNES) !== 0;
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var bindable = (flags & PROPS_IS_BINDABLE) !== 0;
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var bindable = (flags & PROPS_IS_BINDABLE) !== 0;
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var lazy = (flags & PROPS_IS_LAZY_INITIAL) !== 0;
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var lazy = (flags & PROPS_IS_LAZY_INITIAL) !== 0;
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var is_store_sub = false;
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var prop_value;
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if (bindable) {
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[prop_value, is_store_sub] = capture_store_binding(() => /** @type {V} */ (props[key]));
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} else {
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prop_value = /** @type {V} */ (props[key]);
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}
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// Can be the case when someone does `mount(Component, props)` with `let props = $state({...})`
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// or `createClassComponent(Component, props)`
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var is_entry_props = STATE_SYMBOL in props || LEGACY_PROPS in props;
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var setter =
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(bindable &&
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(get_descriptor(props, key)?.set ??
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(is_entry_props && key in props && ((v) => (props[key] = v))))) ||
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undefined;
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var fallback_value = /** @type {V} */ (fallback);
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var fallback_value = /** @type {V} */ (fallback);
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var fallback_dirty = true;
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var fallback_dirty = true;
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var fallback_used = false;
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var get_fallback = () => {
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var get_fallback = () => {
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fallback_used = true;
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if (fallback_dirty) {
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if (fallback_dirty) {
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fallback_dirty = false;
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fallback_dirty = false;
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if (lazy) {
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fallback_value = untrack(/** @type {() => V} */ (fallback));
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fallback_value = lazy
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} else {
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? untrack(/** @type {() => V} */ (fallback))
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fallback_value = /** @type {V} */ (fallback);
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: /** @type {V} */ (fallback);
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}
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}
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}
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return fallback_value;
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return fallback_value;
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};
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};
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if (prop_value === undefined && fallback !== undefined) {
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/** @type {((v: V) => void) | undefined} */
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if (setter && runes) {
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var setter;
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e.props_invalid_value(key);
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}
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prop_value = get_fallback();
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if (bindable) {
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if (setter) setter(prop_value);
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// Can be the case when someone does `mount(Component, props)` with `let props = $state({...})`
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// or `createClassComponent(Component, props)`
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var is_entry_props = STATE_SYMBOL in props || LEGACY_PROPS in props;
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setter =
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get_descriptor(props, key)?.set ??
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(is_entry_props && key in props ? (v) => (props[key] = v) : undefined);
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}
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var initial_value;
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var is_store_sub = false;
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if (bindable) {
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[initial_value, is_store_sub] = capture_store_binding(() => /** @type {V} */ (props[key]));
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} else {
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initial_value = /** @type {V} */ (props[key]);
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}
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if (initial_value === undefined && fallback !== undefined) {
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initial_value = get_fallback();
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if (setter) {
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if (runes) e.props_invalid_value(key);
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setter(initial_value);
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}
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}
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}
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/** @type {() => V} */
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/** @type {() => V} */
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var getter;
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var getter;
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if (runes) {
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if (runes) {
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getter = () => {
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getter = () => {
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var value = /** @type {V} */ (props[key]);
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var value = /** @type {V} */ (props[key]);
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if (value === undefined) return get_fallback();
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if (value === undefined) return get_fallback();
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fallback_dirty = true;
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fallback_dirty = true;
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fallback_used = false;
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return value;
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return value;
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};
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};
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} else {
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} else {
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// Svelte 4 did not trigger updates when a primitive value was updated to the same value.
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// Replicate that behavior through using a derived
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var derived_getter = (immutable ? derived : derived_safe_equal)(
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() => /** @type {V} */ (props[key])
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);
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derived_getter.f |= LEGACY_DERIVED_PROP;
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getter = () => {
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getter = () => {
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var value = get(derived_getter);
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var value = /** @type {V} */ (props[key]);
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if (value !== undefined) fallback_value = /** @type {V} */ (undefined);
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if (value !== undefined) {
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// in legacy mode, we don't revert to the fallback value
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// if the prop goes from defined to undefined. The easiest
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// way to model this is to make the fallback undefined
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// as soon as the prop has a value
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fallback_value = /** @type {V} */ (undefined);
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}
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return value === undefined ? fallback_value : value;
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return value === undefined ? fallback_value : value;
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};
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};
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}
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}
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// easy mode — prop is never written to
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// prop is never written to — we only need a getter
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if ((flags & PROPS_IS_UPDATED) === 0 && runes) {
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if (runes && (flags & PROPS_IS_UPDATED) === 0) {
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return getter;
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return getter;
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}
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}
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// intermediate mode — prop is written to, but the parent component had
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// prop is written to, but the parent component had `bind:foo` which
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// `bind:foo` which means we can just call `$$props.foo = value` directly
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// means we can just call `$$props.foo = value` directly
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if (setter) {
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if (setter) {
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var legacy_parent = props.$$legacy;
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var legacy_parent = props.$$legacy;
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return function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
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return function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
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if (arguments.length > 0) {
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if (arguments.length > 0) {
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// We don't want to notify if the value was mutated and the parent is in runes mode.
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// We don't want to notify if the value was mutated and the parent is in runes mode.
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@ -352,82 +354,41 @@ export function prop(props, key, flags, fallback) {
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if (!runes || !mutation || legacy_parent || is_store_sub) {
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if (!runes || !mutation || legacy_parent || is_store_sub) {
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/** @type {Function} */ (setter)(mutation ? getter() : value);
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/** @type {Function} */ (setter)(mutation ? getter() : value);
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}
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}
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return value;
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return value;
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} else {
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return getter();
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}
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}
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return getter();
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};
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};
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}
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}
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// hard mode. this is where it gets ugly — the value in the child should
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// Either prop is written to, but there's no binding, which means we
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// synchronize with the parent, but it should also be possible to temporarily
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// create a derived that we can write to locally.
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// set the value to something else locally.
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// Or we are in legacy mode where we always create a derived to replicate that
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var from_child = false;
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// Svelte 4 did not trigger updates when a primitive value was updated to the same value.
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var was_from_child = false;
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var d = ((flags & PROPS_IS_IMMUTABLE) !== 0 ? derived : derived_safe_equal)(getter);
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// The derived returns the current value. The underlying mutable
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// source is written to from various places to persist this value.
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var inner_current_value = mutable_source(prop_value);
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var current_value = derived(() => {
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var parent_value = getter();
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var child_value = get(inner_current_value);
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if (from_child) {
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from_child = false;
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was_from_child = true;
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return child_value;
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}
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was_from_child = false;
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return (inner_current_value.v = parent_value);
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});
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// Ensure we eagerly capture the initial value if it's bindable
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if (bindable) {
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get(current_value);
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}
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if (!immutable) current_value.equals = safe_equals;
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// Capture the initial value if it's bindable
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if (bindable) get(d);
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return function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
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return function (/** @type {any} */ value, /** @type {boolean} */ mutation) {
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// legacy nonsense — need to ensure the source is invalidated when necessary
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// also needed for when handling inspect logic so we can inspect the correct source signal
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if (captured_signals !== null) {
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// set this so that we don't reset to the parent value if `d`
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// is invalidated because of `invalidate_inner_signals` (rather
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// than because the parent or child value changed)
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from_child = was_from_child;
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// invoke getters so that signals are picked up by `invalidate_inner_signals`
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getter();
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get(inner_current_value);
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}
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if (arguments.length > 0) {
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if (arguments.length > 0) {
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const new_value = mutation ? get(current_value) : runes && bindable ? proxy(value) : value;
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const new_value = mutation ? get(d) : runes && bindable ? proxy(value) : value;
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if (!current_value.equals(new_value)) {
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from_child = true;
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set(inner_current_value, new_value);
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// To ensure the fallback value is consistent when used with proxies, we
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// update the local fallback_value, but only if the fallback is actively used
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if (fallback_used && fallback_value !== undefined) {
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fallback_value = new_value;
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}
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if (has_destroyed_component_ctx(current_value)) {
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set(d, new_value);
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return value;
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}
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untrack(() => get(current_value)); // force a synchronisation immediately
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if (fallback_value !== undefined) {
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fallback_value = new_value;
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}
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}
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return value;
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return value;
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}
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}
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if (has_destroyed_component_ctx(current_value)) {
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// TODO is this still necessary post-#16263?
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return current_value.v;
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if (has_destroyed_component_ctx(d)) {
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return d.v;
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}
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}
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return get(current_value);
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return get(d);
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};
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};
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}
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}
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Rich Harris
3 months ago