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小百科  ›  hardhat - Why do I get "Cannot find name" errors in a TypeScript script that uses Uniswap? - Ethereum Stack Exchange
const position
性感的鸵鸟
2 年前

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I was following this tutorial and then I followed this tutorial to mint a position on a Uniswap pool.

This is the final script I end up with: 

import { ethers } from "ethers";
import { Pool } from "@uniswap/v3-sdk";
import { Token } from "@uniswap/sdk-core";
import { abi as IUniswapV3PoolABI } from "@uniswap/v3-core/artifacts/contracts/interfaces/IUniswapV3Pool.sol/IUniswapV3Pool.json";
const provider = new ethers.providers.JsonRpcProvider("http://127.0.0.1:8545/");
const poolAddress = "0x8ad599c3A0ff1De082011EFDDc58f1908eb6e6D8";
const poolContract = new ethers.Contract(
  poolAddress,
  IUniswapV3PoolABI,
  provider
interface Immutables {
  factory: string;
  token0: string;
  token1: string;
  fee: number;
  tickSpacing: number;
  maxLiquidityPerTick: ethers.BigNumber;
interface State {
  liquidity: ethers.BigNumber;
  sqrtPriceX96: ethers.BigNumber;
  tick: number;
  observationIndex: number;
  observationCardinality: number;
  observationCardinalityNext: number;
  feeProtocol: number;
  unlocked: boolean;
async function getPoolImmutables() {
  const [factory, token0, token1, fee, tickSpacing, maxLiquidityPerTick] =
    await Promise.all([
      poolContract.factory(),
      poolContract.token0(),
      poolContract.token1(),
      poolContract.fee(),
      poolContract.tickSpacing(),
      poolContract.maxLiquidityPerTick(),
  const immutables: Immutables = {
    factory,
    token0,
    token1,
    tickSpacing,
    maxLiquidityPerTick,
  return immutables;
async function getPoolState() {
  const [liquidity, slot] = await Promise.all([
    poolContract.liquidity(),
    poolContract.slot0(),
  const PoolState: State = {
    liquidity,
    sqrtPriceX96: slot[0],
    tick: slot[1],
    observationIndex: slot[2],
    observationCardinality: slot[3],
    observationCardinalityNext: slot[4],
    feeProtocol: slot[5],
    unlocked: slot[6],
  return PoolState;
async function main() {
  const [immutables, state] = await Promise.all([
    getPoolImmutables(),
    getPoolState(),
  const TokenA = new Token(3, immutables.token0, 6, "USDC", "USD Coin");
  const TokenB = new Token(3, immutables.token1, 18, "WETH", "Wrapped Ether");
  const poolExample = new Pool(
    TokenA,
    TokenB,
    immutables.fee,
    state.sqrtPriceX96.toString(),
    state.liquidity.toString(),
    state.tick
  console.log(poolExample);
  const position = new Position({
    pool: poolExample,
    liquidity: state.liquidity * 0.0002,
    tickLower: nearestUsableTick(state.tick, immutables.tickSpacing) - immutables.tickSpacing  * 2,
    tickUpper: nearestUsableTick(state.tick, immutables.tickSpacing) + immutables.tickSpacing * 2
  const deadline = block.timestamp + 200;
  const { calldata, value } = NonfungiblePositionManager.addCallParameters(position, {
    slippageTolerance: new Percent(50, 10_000),
    recipient: sender,
    deadline: deadline
main();

Here's my error log:


(base) john@johns-computer:~/Documents/Projects/Blockchain_projects/uniswap-example$ npx hardhat run scripts/interacting-with-pool-liqudity.ts 
/home/john/Documents/Projects/Blockchain_projects/uniswap-example/node_modules/ts-node/src/index.ts:750
    return new TSError(diagnosticText, diagnosticCodes);
TSError: ⨯ Unable to compile TypeScript:
scripts/interacting-with-pool-liqudity.ts:98:24 - error TS2552: Cannot find name 'Position'. Did you mean 'position'?
98   const position = new Position({
                          ~~~~~~~~
  scripts/interacting-with-pool-liqudity.ts:98:9
    98   const position = new Position({
               ~~~~~~~~
    'position' is declared here.
scripts/interacting-with-pool-liqudity.ts:100:16 - error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.
100     liquidity: state.liquidity * 0.0002,
                   ~~~~~~~~~~~~~~~
scripts/interacting-with-pool-liqudity.ts:101:16 - error TS2304: Cannot find name 'nearestUsableTick'.
101     tickLower: nearestUsableTick(state.tick, immutables.tickSpacing) - immutables.tickSpacing  * 2,
                   ~~~~~~~~~~~~~~~~~
scripts/interacting-with-pool-liqudity.ts:102:16 - error TS2304: Cannot find name 'nearestUsableTick'.
102     tickUpper: nearestUsableTick(state.tick, immutables.tickSpacing) + immutables.tickSpacing * 2
                   ~~~~~~~~~~~~~~~~~
scripts/interacting-with-pool-liqudity.ts:105:20 - error TS2304: Cannot find name 'block'.
105   const deadline = block.timestamp + 200;
                       ~~~~~
scripts/interacting-with-pool-liqudity.ts:107:31 - error TS2304: Cannot find name 'NonfungiblePositionManager'.
107   const { calldata, value } = NonfungiblePositionManager.addCallParameters(position, {
                                  ~~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/interacting-with-pool-liqudity.ts:108:28 - error TS2304: Cannot find name 'Percent'.
108     slippageTolerance: new Percent(50, 10_000),
                               ~~~~~~~
scripts/interacting-with-pool-liqudity.ts:109:16 - error TS2304: Cannot find name 'sender'.
109     recipient: sender,
                   ~~~~~~
    at createTSError (/home/john/Documents/Projects/Blockchain_projects/uniswap-example/node_modules/ts-node/src/index.ts:750:12)
    at reportTSError (/home/john/Documents/Projects/Blockchain_projects/uniswap-example/node_modules/ts-node/src/index.ts:754:19)
    at getOutput (/home/john/Documents/Projects/Blockchain_projects/uniswap-example/node_modules/ts-node/src/index.ts:941:36)
    at Object.compile (/home/john/Documents/Projects/Blockchain_projects/uniswap-example/node_modules/ts-node/src/index.ts:1243:30)
    at Module.m._compile (/home/john/Documents/Projects/Blockchain_projects/uniswap-example/node_modules/ts-node/src/index.ts:1370:30)
    at Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Object.require.extensions.<computed> [as .ts] (/home/john/Documents/Projects/Blockchain_projects/uniswap-example/node_modules/ts-node/src/index.ts:1374:12)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) {
  diagnosticText: "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m98\x1B[0m:\x1B[93m24\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2552: \x1B[0mCannot find name 'Position'. Did you mean 'position'?\n" +
    '\n' +
    '\x1B[7m98\x1B[0m   const position = new Position({\n' +
    '\x1B[7m  \x1B[0m \x1B[91m                       ~~~~~~~~\x1B[0m\n' +
    '\n' +
    '  \x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m98\x1B[0m:\x1B[93m9\x1B[0m\n' +
    '    \x1B[7m98\x1B[0m   const position = new Position({\n' +
    '    \x1B[7m  \x1B[0m \x1B[96m        ~~~~~~~~\x1B[0m\n' +
    "    'position' is declared here.\n" +
    "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m100\x1B[0m:\x1B[93m16\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2362: \x1B[0mThe left-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.\n" +
    '\n' +
    '\x1B[7m100\x1B[0m     liquidity: state.liquidity * 0.0002,\n' +
    '\x1B[7m   \x1B[0m \x1B[91m               ~~~~~~~~~~~~~~~\x1B[0m\n' +
    "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m101\x1B[0m:\x1B[93m16\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2304: \x1B[0mCannot find name 'nearestUsableTick'.\n" +
    '\n' +
    '\x1B[7m101\x1B[0m     tickLower: nearestUsableTick(state.tick, immutables.tickSpacing) - immutables.tickSpacing  * 2,\n' +
    '\x1B[7m   \x1B[0m \x1B[91m               ~~~~~~~~~~~~~~~~~\x1B[0m\n' +
    "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m102\x1B[0m:\x1B[93m16\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2304: \x1B[0mCannot find name 'nearestUsableTick'.\n" +
    '\n' +
    '\x1B[7m102\x1B[0m     tickUpper: nearestUsableTick(state.tick, immutables.tickSpacing) + immutables.tickSpacing * 2\n' +
    '\x1B[7m   \x1B[0m \x1B[91m               ~~~~~~~~~~~~~~~~~\x1B[0m\n' +
    "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m105\x1B[0m:\x1B[93m20\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2304: \x1B[0mCannot find name 'block'.\n" +
    '\n' +
    '\x1B[7m105\x1B[0m   const deadline = block.timestamp + 200;\n' +
    '\x1B[7m   \x1B[0m \x1B[91m                   ~~~~~\x1B[0m\n' +
    "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m107\x1B[0m:\x1B[93m31\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2304: \x1B[0mCannot find name 'NonfungiblePositionManager'.\n" +
    '\n' +
    '\x1B[7m107\x1B[0m   const { calldata, value } = NonfungiblePositionManager.addCallParameters(position, {\n' +
    '\x1B[7m   \x1B[0m \x1B[91m                              ~~~~~~~~~~~~~~~~~~~~~~~~~~\x1B[0m\n' +
    "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m108\x1B[0m:\x1B[93m28\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2304: \x1B[0mCannot find name 'Percent'.\n" +
    '\n' +
    '\x1B[7m108\x1B[0m     slippageTolerance: new Percent(50, 10_000),\n' +
    '\x1B[7m   \x1B[0m \x1B[91m                           ~~~~~~~\x1B[0m\n' +
    "\x1B[96mscripts/interacting-with-pool-liqudity.ts\x1B[0m:\x1B[93m109\x1B[0m:\x1B[93m16\x1B[0m - \x1B[91merror\x1B[0m\x1B[90m TS2304: \x1B[0mCannot find name 'sender'.\n" +
    '\n' +
    '\x1B[7m109\x1B[0m     recipient: sender,\n' +
    '\x1B[7m   \x1B[0m \x1B[91m               ~~~~~~\x1B[0m\n',
  diagnosticCodes: [
    2552, 2362, 2304,
    2304, 2304, 2304,
    2304, 2304

I'm assuming I'm dealing with some import errors, but I don't know which ones. I googled the errors, but couldn't find the answer. Can someone tell me what's going on?


Thanks in advance!


EDIT: I was able to solve some of the errors (I updated the code and the error log), but some of the errors still persist. Namely, the error which says Cannot find name 'nearestUsableTick' persists, but I can see that it's defined in the Uniswap documentation here.


Any help on this?

        
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