@virtualstate/app-history/esnext/app-history-transition-planner.js

Native JavaScript [app-history](https://github.com/WICG/app-history) implementation

import { AppHistoryTransitionNavigationType, AppHistoryTransitionWait, AppHistoryTransitionWhile, } from "./app-history-transition.js";
import { InvalidStateError } from "./app-history-errors.js";
export const AppHistoryTransitionPlanAppHistorySymbol = Symbol.for("@virtualstate/app-history/transition/plan/appHistory");
export const AppHistoryTransitionPlanWhile = Symbol.for("@virtualstate/app-history/transition/plan/while");
export const AppHistoryTransitionPlanWait = Symbol.for("@virtualstate/app-history/transition/plan/wait");
export function plan(options) {
    const { transition, currentPlan, constructAppHistory, finishedTransitions, } = options;
    const nextPlan = {
        [AppHistoryTransitionPlanAppHistorySymbol]: currentPlan?.[AppHistoryTransitionPlanAppHistorySymbol] ?? constructAppHistory(),
        transitions: [],
        ...currentPlan,
        knownTransitions: new Set(currentPlan?.knownTransitions ?? []),
        [AppHistoryTransitionPlanWhile]: transition[AppHistoryTransitionWhile],
        [AppHistoryTransitionPlanWait]: transition[AppHistoryTransitionWait]
    };
    if (nextPlan.knownTransitions.has(transition)) {
        throw new InvalidStateError("Transition already found in plan, this may lead to unexpected behaviour, please raise an issue at ");
    }
    nextPlan.knownTransitions.add(transition);
    if (transition[AppHistoryTransitionNavigationType] === "traverse") {
        nextPlan.transitions.push(transition);
    }
    else {
        // Reset on non traversal
        nextPlan.transitions =
            []
                .concat([transition]);
    }
    nextPlan.transitions = nextPlan.transitions
        // Remove finished transitions
        .filter(transition => finishedTransitions?.has(transition));
    return nextPlan;
}
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