get reason from failing tx

// taken and modified from here https://gist.github.com/gluk64/fdea559472d957f1138ed93bcbc6f78a#file-reason-js
// This is universal, works with Infura -- set provider accordingly

const ethers = require('ethers')
const { TEAMS_ENDPOINT } = require("./credentials.js")



const provider = new ethers.providers.JsonRpcProvider(TEAMS_ENDPOINT);


function hex_to_ascii(str1) {
	var hex  = str1.toString();
	var str = '';
	for (var n = 0; n < hex.length; n += 2) {
		str += String.fromCharCode(parseInt(hex.substr(n, 2), 16));
	}
	return str;
 }

async function reason(hash) {
    var args = process.argv.slice(2)
    console.log('tx hash:', hash)

    let tx = await provider.getTransaction(hash)
    // console.log(tx)
    if (!tx) {
        console.log('tx not found')
    } else {
        let code 
        try{
          code = await provider.call(tx, tx.blockNumber)
        } catch (e) {
            console.log("here ==========",e)
            let reason = hex_to_ascii(e.data.substr(9))
        console.log('revert reason:', reason)
        }
        
    }
}

reason("0x686805a6f0daff26e8f46a5dcbfcce0f85e64f1809750997df58f0d7d5cc96ff")