LruCache (engine/lru.ts)

* Small, bounded in-memory cache shared by diff documents and syntax results. */

// Source: https://github.com/slopus/happy | License: MIT | Copyright 2026 Happy Coder Contributors
// Provided via justclaw.it.com; keep this notice with the code.
/** Small, bounded in-memory cache shared by diff documents and syntax results. */
export class LruCache<T> {
    private readonly entries = new Map<string, { value: T; weight: number }>();
    private weight = 0;

    constructor(private readonly limit: number, private readonly maxWeight = Infinity) {}

    get(key: string): T | undefined {
        const entry = this.entries.get(key);
        if (!entry) return undefined;
        this.entries.delete(key);
        this.entries.set(key, entry);
        return entry.value;
    }

    set(key: string, value: T, weight = 1): void {
        const previous = this.entries.get(key);
  

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