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#issue 1: Source "@openzeppelin/contracts/..." not found: File import callback not supported #solution 1: https://github.com/juanfranblanco/vscode-solidity#openzeppelin

  • Go to solidity extension (Ethereum Solidity Language for Vistual Studio Code)
  • Go to Workspace tab on the setting page.
  • Make sure that packageDefaultDependenciesDirectory points to correct path for package defult dependencies directory If the solidity project is in solution of the workspace. "solidity.packageDefaultDependenciesContractsDirectory": "", "solidity.packageDefaultDependenciesDirectory": "<solidity_project>/node_modules"

#2 For Opensea ERC1155 project

npm install --save-dev opensea-js //require node 8.11 npm install --save-dev multi-token-standard //ok on current node version 16 (or yarn add multi-token-standard) npm install --save-dev @0x/subproviders //ok npm install --save-dev eth-gas-reporter //installation failed npm install dotenv // useful for .env file and use in js codes. it works only on HTTP.

#3 Install some truffle packages https://www.npmjs.com/package/truffle-assertions

npm install --save truffle

// This package adds additional assertions that can be used to test Ethereum smart contracts inside Truffle tests. npm install truffle-assertions

//This Truffle plugin displays the contract size of all or a selection of your smart contracts in kilobytes npm install truffle-contract-size

//Truffle Flattener concats solidity files from Truffle and Buidler projects with all of their dependencies. //This tool helps you to verify contracts developed with Truffle and Buidler on Etherscan, or debugging them on Remix, by merging your files and their dependencies in the right order. npm install truffle-flattener -g

npm install --save eth-gas-reporter npm install --save truffle-plugin-verify

npm install --save-dev ethereum-waffle //The most advanced framework for testing smart contracts.

Truffle commands

Look for Usage, Description, and Options of migrate command

$truffle help migrate

without compilation before migrating, run contracts from a specific migration to a specific migration

The number refers to the prefix of the migration file.

i.e: $ truffle migrate --f 1 --to 3 --compile-none --network rinkeby

Look for Usage, Description, and Options of test command

$truffle help test i.e: $ truffle test ../test/presale/token.test.js --compile-none

bytes data: 0x00000000000000000000000000000000000000000000000000000000686f6c61

if (network === 'rinkeby') { proxyRegistryAddress = "0xf57b2c51ded3a29e6891aba85459d600256cf317"; } else { proxyRegistryAddress = "0xa5409ec958c83c3f309868babaca7c86dcb077c1"; }