How to use larger than MAX_SAFE_NUMBER in ERC20 transferTo?

[emclab]

When transferring ERC20 fund with the code below,

let a = await contractFYX.transfer(to, amount*10**18); //here amount=10, total 10**19 which is larger than MAX_SAFE_NUMBER

here is an error:

Error in transfer fund to :  Error: overflow (fault="overflow", operation="BigNumber.from", value=10000000000000000000, code=NUMERIC_FAULT, version=bignumber/5.3.0)  //<<==ethers 5.3.0
    at Logger.makeError (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\logger\lib\index.js:187:21)
    at Logger.throwError (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\logger\lib\index.js:196:20)
    at throwFault (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\bignumber\lib\bignumber.js:305:19)
    at Function.BigNumber.from (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\bignumber\lib\bignumber.js:208:17)
    at NumberCoder.encode (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\abi\lib\coders\number.js:36:39)
    at C:\d\code\js\xjc_bbone\node_modules\@ethersproject\abi\lib\coders\array.js:74:19
    at Array.forEach (<anonymous>)
    at Object.pack (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\abi\lib\coders\array.js:60:12)
    at TupleCoder.encode (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\abi\lib\coders\tuple.js:71:24)
    at AbiCoder.encode (C:\d\code\js\xjc_bbone\node_modules\@ethersproject\abi\lib\abi-coder.js:93:15) {
  reason: 'overflow',
  code: 'NUMERIC_FAULT',
  fault: 'overflow',
  operation: 'BigNumber.from',
  value: 10000000000000000000
}

What is the right way to use >MAX_SAFE_NUMBER integer in transferTo?

[ricmoo]

You must use a safe way to create a BigNumber instance. For example, all these produce the same value:

BigNumber.from("1000000000000000")
BigNumber.from(10).pow(18)

// the best way is to use the parseEther and parseUnits method
parseEther("1.0")
parseUnits("1.0", 18)

I recommend taking a quick look through the docs. The getting started document covers this and many other useful examples. :)

[emclab]

I guess that I can call with

let a = await contractFYX.transfer(to, ethers.utils.BigNumber.from(amount*10**18));

Or:

let a = await contractFYX.transfer(to, ethers.utils.parseEther(${amount}));

The token is not Ether but it has 10**18 which is similar to ether.