@rarible/estimate-middleware/esm/index.js

import { createFetchMiddleware, providerAsMiddleware, providerFromEngine } from "eth-json-rpc-middleware";
import { JsonRpcEngine } from "json-rpc-engine";
import { createEstimateGasMiddleware } from "./middleware.js";
import { isSafeEventEmitterProvider } from "./utils.js";
export function estimate(provider, options = {}) {
    if (isSafeEventEmitterProvider(provider)) {
        const engine = new JsonRpcEngine();
        const estimateEngine = getEstimateEngine(provider, options.estimation);
        engine.push(createEstimateGasMiddleware(estimateEngine, options.force, options.threshold));
        engine.push(providerAsMiddleware(provider));
        return providerFromEngine(engine);
    }
    return provider;
}
function getEstimateEngine(provider, estimate) {
    if (estimate === undefined) {
        const estimateEngine = new JsonRpcEngine();
        estimateEngine.push(providerAsMiddleware(provider));
        return estimateEngine;
    }
    else if (typeof estimate === "string") {
        const engine = new JsonRpcEngine();
        engine.push(createFetchMiddleware({ rpcUrl: estimate }));
        return engine;
    }
    else {
        return estimate;
    }
}