ahmido
1fec9c6f9d
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## Summary - introduce surface-aware compressed governance outcomes and reuse the shared truth/explanation seams for operator-first summaries - apply the compressed outcome hierarchy across baseline, evidence, review, review-pack, canonical review/evidence, and artifact-oriented operation-run surfaces - expand spec 214 fixtures and Pest coverage, and fix tenant-panel route assertions by generating explicit tenant-panel URLs in the affected Filament tests ## Validation - `cd apps/platform && ./vendor/bin/sail bin pint --dirty --format agent` - focused governance compression suite from `specs/214-governance-outcome-compression/quickstart.md` passed (`68` tests, `445` assertions) - `cd apps/platform && ./vendor/bin/sail artisan test --compact tests/Feature/Filament/InventoryItemResourceTest.php tests/Feature/Filament/BackupSetUiEnforcementTest.php tests/Feature/Filament/RestoreRunUiEnforcementTest.php` passed (`18` tests, `81` assertions) Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de> Reviewed-on: #253
94 lines
3.5 KiB
Plaintext
94 lines
3.5 KiB
Plaintext
import { Observable } from '../Observable';
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import { EmptyError } from '../util/EmptyError';
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import { OperatorFunction, TruthyTypesOf } from '../types';
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import { filter } from './filter';
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import { take } from './take';
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import { defaultIfEmpty } from './defaultIfEmpty';
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import { throwIfEmpty } from './throwIfEmpty';
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import { identity } from '../util/identity';
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export function first<T, D = T>(predicate?: null, defaultValue?: D): OperatorFunction<T, T | D>;
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export function first<T>(predicate: BooleanConstructor): OperatorFunction<T, TruthyTypesOf<T>>;
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export function first<T, D>(predicate: BooleanConstructor, defaultValue: D): OperatorFunction<T, TruthyTypesOf<T> | D>;
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export function first<T, S extends T>(
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predicate: (value: T, index: number, source: Observable<T>) => value is S,
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defaultValue?: S
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): OperatorFunction<T, S>;
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export function first<T, S extends T, D>(
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predicate: (value: T, index: number, source: Observable<T>) => value is S,
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defaultValue: D
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): OperatorFunction<T, S | D>;
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export function first<T, D = T>(
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predicate: (value: T, index: number, source: Observable<T>) => boolean,
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defaultValue?: D
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): OperatorFunction<T, T | D>;
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/**
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* Emits only the first value (or the first value that meets some condition)
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* emitted by the source Observable.
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*
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* <span class="informal">Emits only the first value. Or emits only the first
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* value that passes some test.</span>
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*
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* 
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*
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* If called with no arguments, `first` emits the first value of the source
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* Observable, then completes. If called with a `predicate` function, `first`
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* emits the first value of the source that matches the specified condition. Emits an error
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* notification if `defaultValue` was not provided and a matching element is not found.
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*
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* ## Examples
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*
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* Emit only the first click that happens on the DOM
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*
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* ```ts
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* import { fromEvent, first } from 'rxjs';
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*
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* const clicks = fromEvent(document, 'click');
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* const result = clicks.pipe(first());
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* result.subscribe(x => console.log(x));
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* ```
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*
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* Emits the first click that happens on a DIV
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*
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* ```ts
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* import { fromEvent, first } from 'rxjs';
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*
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* const div = document.createElement('div');
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* div.style.cssText = 'width: 200px; height: 200px; background: #09c;';
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* document.body.appendChild(div);
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*
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* const clicks = fromEvent(document, 'click');
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* const result = clicks.pipe(first(ev => (<HTMLElement>ev.target).tagName === 'DIV'));
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* result.subscribe(x => console.log(x));
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* ```
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*
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* @see {@link filter}
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* @see {@link find}
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* @see {@link take}
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* @see {@link last}
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*
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* @throws {EmptyError} Delivers an `EmptyError` to the Observer's `error`
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* callback if the Observable completes before any `next` notification was sent.
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* This is how `first()` is different from `take(1)` which completes instead.
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*
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* @param predicate An optional function called with each item to test for condition
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* matching.
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* @param defaultValue The default value emitted in case no valid value was found on
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* the source.
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* @return A function that returns an Observable that emits the first item that
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* matches the condition.
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*/
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export function first<T, D>(
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predicate?: ((value: T, index: number, source: Observable<T>) => boolean) | null,
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defaultValue?: D
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): OperatorFunction<T, T | D> {
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const hasDefaultValue = arguments.length >= 2;
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return (source: Observable<T>) =>
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source.pipe(
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predicate ? filter((v, i) => predicate(v, i, source)) : identity,
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take(1),
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hasDefaultValue ? defaultIfEmpty(defaultValue!) : throwIfEmpty(() => new EmptyError())
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);
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}
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