Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { DEV } from 'esm-env';
import { is_promise } from '../../../shared/utils.js';
import { block, branch, pause_effect, resume_effect } from '../../reactivity/effects.js';
import { internal_set, mutable_source, source } from '../../reactivity/sources.js';
import {
component_context,
flush_sync,
is_runes,
set_active_effect,
set_active_reaction,
set_component_context,
set_dev_current_component_function
} from '../../runtime.js';
import { hydrate_next, hydrate_node, hydrating } from '../hydration.js';
import { queue_micro_task } from '../task.js';
const PENDING = 0;
const THEN = 1;
const CATCH = 2;
/**
* @template V
* @param {TemplateNode} node
* @param {(() => Promise<V>)} get_input
* @param {null | ((anchor: Node) => void)} pending_fn
* @param {null | ((anchor: Node, value: Source<V>) => void)} then_fn
* @param {null | ((anchor: Node, error: unknown) => void)} catch_fn
* @returns {void}
*/
export function await_block(node, get_input, pending_fn, then_fn, catch_fn) {
if (hydrating) {
hydrate_next();
}
var anchor = node;
var runes = is_runes();
var active_component_context = component_context;
/** @type {any} */
var component_function = DEV ? component_context?.function : null;
/** @type {V | Promise<V> | null} */
var input;
/** @type {Effect | null} */
var pending_effect;
/** @type {Effect | null} */
var then_effect;
/** @type {Effect | null} */
var catch_effect;
var input_source = (runes ? source : mutable_source)(/** @type {V} */ (undefined));
var error_source = (runes ? source : mutable_source)(undefined);
var resolved = false;
/**
* @param {PENDING | THEN | CATCH} state
* @param {boolean} restore
*/
function update(state, restore) {
resolved = true;
if (restore) {
set_active_effect(effect);
set_active_reaction(effect); // TODO do we need both?
set_component_context(active_component_context);
if (DEV) set_dev_current_component_function(component_function);
}
if (state === PENDING && pending_fn) {
if (pending_effect) resume_effect(pending_effect);
else pending_effect = branch(() => pending_fn(anchor));
}
if (state === THEN && then_fn) {
if (then_effect) resume_effect(then_effect);
else then_effect = branch(() => then_fn(anchor, input_source));
}
if (state === CATCH && catch_fn) {
if (catch_effect) resume_effect(catch_effect);
else catch_effect = branch(() => catch_fn(anchor, error_source));
}
if (state !== PENDING && pending_effect) {
pause_effect(pending_effect, () => (pending_effect = null));
}
if (state !== THEN && then_effect) {
pause_effect(then_effect, () => (then_effect = null));
}
if (state !== CATCH && catch_effect) {
pause_effect(catch_effect, () => (catch_effect = null));
}
if (restore) {
if (DEV) set_dev_current_component_function(null);
set_component_context(null);
set_active_reaction(null);
set_active_effect(null);
// without this, the DOM does not update until two ticks after the promise
// resolves, which is unexpected behaviour (and somewhat irksome to test)
flush_sync();
}
}
var effect = block(() => {
if (input === (input = get_input())) return;
if (is_promise(input)) {
var promise = input;
resolved = false;
promise.then(
(value) => {
if (promise !== input) return;
// we technically could use `set` here since it's on the next microtick
// but let's use internal_set for consistency and just to be safe
internal_set(input_source, value);
update(THEN, true);
},
(error) => {
if (promise !== input) return;
// we technically could use `set` here since it's on the next microtick
// but let's use internal_set for consistency and just to be safe
internal_set(error_source, error);
update(CATCH, true);
}
);
if (hydrating) {
if (pending_fn) {
pending_effect = branch(() => pending_fn(anchor));
}
} else {
// Wait a microtask before checking if we should show the pending state as
// the promise might have resolved by the next microtask.
queue_micro_task(() => {
if (!resolved) update(PENDING, true);
});
}
} else {
internal_set(input_source, input);
update(THEN, false);
}
// Set the input to null, in order to disable the promise callbacks
return () => (input = null);
});
if (hydrating) {
anchor = hydrate_node;
}
}
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