Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {
current_component_context,
current_effect,
current_reaction,
flush_sync,
set_current_component_context,
set_current_effect,
set_current_reaction,
set_dev_current_component_function
} from '../../runtime.js';
import { block, branch, destroy_effect, pause_effect } from '../../reactivity/effects.js';
import { INERT } from '../../constants.js';
import { DEV } from 'esm-env';
import { queue_micro_task } from '../task.js';
import { hydrating } from '../hydration.js';
import { set, source } from '../../reactivity/sources.js';
/**
* @template V
* @param {Comment} anchor
* @param {(() => Promise<V>)} get_input
* @param {null | ((anchor: Node) => void)} pending_fn
* @param {null | ((anchor: Node, value: V) => void)} then_fn
* @param {null | ((anchor: Node, error: unknown) => void)} catch_fn
* @returns {void}
*/
export function await_block(anchor, get_input, pending_fn, then_fn, catch_fn) {
const component_context = current_component_context;
/** @type {any} */
let component_function;
if (DEV) {
component_function = component_context?.function ?? null;
}
/** @type {any} */
let input;
let input_source = source(undefined);
let error_source = source(undefined);
/** @type {import('#client').Effect | null} */
let pending_effect;
/** @type {import('#client').Effect | null} */
let then_effect;
/** @type {import('#client').Effect | null} */
let catch_effect;
let pending = false;
/**
* @param {(anchor: Comment, value: any) => void} fn
* @param {any} value
*/
function create_effect(fn, value) {
set_current_effect(effect);
set_current_reaction(effect); // TODO do we need both?
set_current_component_context(component_context);
if (DEV) {
set_dev_current_component_function(component_function);
}
var e = branch(() => fn(anchor, value));
if (DEV) {
set_dev_current_component_function(null);
}
set_current_component_context(null);
set_current_reaction(null);
set_current_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();
return e;
}
const effect = block(() => {
if (input === (input = get_input())) return;
if (is_promise(input)) {
const promise = /** @type {Promise<any>} */ (input);
var resolved = false;
promise.then(
(value) => {
if (promise !== input) return;
resolved = true;
if (pending_effect) pause_effect(pending_effect);
if (then_fn) {
set(input_source, value);
if (pending || then_effect === undefined) {
then_effect = create_effect(then_fn, input_source);
}
}
},
(error) => {
if (promise !== input) return;
if (pending_effect) pause_effect(pending_effect);
if (then_effect) pause_effect(then_effect);
resolved = true;
if (catch_fn) {
set(error_source, error);
if (pending || catch_effect === undefined) {
catch_effect = create_effect(catch_fn, error_source);
}
}
}
);
if (pending_fn) {
var parent_effect = current_effect;
var parent_reaction = current_reaction;
var show_pending = () => {
if (resolved) return;
pending = true;
if (pending_effect && (pending_effect.f & INERT) === 0) {
destroy_effect(pending_effect);
}
var previous_effect = current_effect;
var previous_reaction = current_reaction;
try {
set_current_effect(parent_effect);
set_current_reaction(parent_reaction);
pending_effect = branch(() => pending_fn(anchor));
if (then_effect) pause_effect(then_effect);
if (catch_effect) pause_effect(catch_effect);
} finally {
set_current_effect(previous_effect);
set_current_reaction(previous_reaction);
}
};
if (hydrating) {
show_pending();
} else {
pending = false;
// 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(show_pending);
}
} else if (catch_fn) {
var show_catch = () => {
if (resolved) return;
pending = true;
if (pending_effect) pause_effect(pending_effect);
if (catch_effect) pause_effect(catch_effect);
if (then_effect) pause_effect(then_effect);
};
if (!hydrating) {
pending = false;
// 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(show_catch);
}
} else {
if (then_effect) {
pending = true;
pause_effect(then_effect);
}
if (catch_effect) {
pending = true;
pause_effect(catch_effect);
}
}
} else {
if (pending_effect) pause_effect(pending_effect);
if (catch_effect) pause_effect(catch_effect);
if (then_fn) {
if (then_effect) {
destroy_effect(then_effect);
}
set(input_source, input);
then_effect = branch(() => then_fn(anchor, /** @type {V} */ (input_source)));
}
}
// Inert effects are proactively detached from the effect tree. Returning a noop
// teardown function is an easy way to ensure that this is not discarded
return noop;
});
}
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