@infinite-canvas-tutorial/webcomponents/esm/history/Delta.d.ts

WebComponents UI implementation

/**
 * Borrow from https://github.com/excalidraw/excalidraw/blob/master/packages/excalidraw/change.ts#L62
 */
/**
 * Represents the difference between two objects of the same type.
 *
 * Both `deleted` and `inserted` partials represent the same set of added, removed or updated properties, where:
 * - `deleted` is a set of all the deleted values
 * - `inserted` is a set of all the inserted (added, updated) values
 *
 * Keeping it as pure object (without transient state, side-effects, etc.), so we won't have to instantiate it on load.
 */
export declare class Delta<T> {
    readonly deleted: Partial<T>;
    readonly inserted: Partial<T>;
    private constructor();
    static create<T>(deleted: Partial<T>, inserted: Partial<T>, modifier?: (delta: Partial<T>) => Partial<T>, modifierOptions?: 'deleted' | 'inserted'): Delta<T>;
    /**
     * Calculates the delta between two objects.
     *
     * @param prevObject - The previous state of the object.
     * @param nextObject - The next state of the object.
     *
     * @returns new delta instance.
     */
    static calculate<T extends {
        [key: string]: any;
    }>(prevObject: T, nextObject: T, modifier?: (partial: Partial<T>) => Partial<T>, postProcess?: (deleted: Partial<T>, inserted: Partial<T>) => [Partial<T>, Partial<T>]): Delta<T>;
    static empty(): Delta<unknown>;
    static isEmpty<T>(delta: Delta<T>): boolean;
    /**
     * Iterator comparing values of object properties based on the passed joining strategy.
     *
     * @yields keys of properties with different values
     *
     * WARN: it's based on shallow compare performed only on the first level and doesn't go deeper than that.
     */
    private static distinctKeysIterator;
}
/**
 * Returns whether object/array is shallow equal.
 * Considers empty object/arrays as equal (whether top-level or second-level).
 */
export declare const isShallowEqual: <T extends Record<string, any>, K extends readonly unknown[]>(objA: T, objB: T, comparators?: { [key in keyof T]?: (a: T[key], b: T[key]) => boolean; } | (keyof T extends K[number] ? K extends readonly (keyof T)[] ? K : {
    _error: "keys are either missing or include keys not in compared obj";
} : {
    _error: "keys are either missing or include keys not in compared obj";
}), debug?: boolean) => boolean;