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leaflet fork for copy edit / bug fixes forked from leaflet.pub/leaflet
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12345678910111213141516171819202122232425262728293031// Taken from https://github.com/rocicorp/lock/blob/main/src/lock.tsexport class Lock { private _lockP: Promise<void> | null = null;
async lock(): Promise<() => void> { const previous = this._lockP; const { promise, resolve } = resolver(); this._lockP = promise; await previous; return resolve; } async withLock<R>(f: () => Promise<R>) { let release = await this.lock(); try { return await f(); } finally { release(); } }}
function resolver() { let resolve!: (v: void) => void; let reject!: () => void; const promise = new Promise<void>((res, rej) => { resolve = res; reject = rej; }); return { promise, resolve, reject };}