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embark/site/source/docs/smart_contract_objects.md
Michael Bradley, Jr 030fb4acc6 build(deps): bump web3[-*] from 1.2.4 to 1.2.6 
Remove `bignumber.js` workaround (in the root, from PR #2152) because it's no
longer needed (verified locally).

Remove the `"skipLibCheck"` workaround (in `packages/plugins/solidity-tests`,
from PR #2152) because it's no longer needed (verified locally).

Refactor a typing in `packages/plugins/geth`. What's happening is that in web3
v1.2.4 `sendTransaction` has a return type of `PromiEvent<TransactionReceipt>`
but in v1.2.6 it has a return type of `PromiEvent<TransactionReceipt |
TransactionRevertInstructionError>`.

Compare:
* [v1.2.4/packages/web3-eth/types/index.d.ts#L291-L294](https://github.com/ethereum/web3.js/blob/v1.2.4/packages/web3-eth/types/index.d.ts#L291-L294)
* [v1.2.6/packages/web3-eth/types/index.d.ts#L295-L298](https://github.com/ethereum/web3.js/blob/v1.2.6/packages/web3-eth/types/index.d.ts#L295-L298)

The problem is that the `TransactionRevertInstructionError` type doesn't have a
`transactionHash` property. Since at present the code in
`packages/plugins/geth/src/devtxs.ts` only deals with the success case re:
`sendTransaction`, import the `TransactionReceipt` type from `web3-eth` and
cast the resolved return value's type using TypeScript's `as` operator.
2020-02-03 10:17:07 -06:00

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title: Smart Contract Objects layout: docs

Interacting with contracts in Javascript

Embark will automatically take care of deployment for you and set all needed JS bindings. For example, the contract below:

// app/contracts/simple_storage.sol

contract SimpleStorage {
  uint public storedData;

  function SimpleStorage(uint initialValue) {
    storedData = initialValue;
  }

  function set(uint x) {
    storedData = x;
  }
  function get() constant returns (uint retVal) {
    return storedData;
  }
}

Will automatically be available in Javascript as:

// app/js/index.js

import SimpleStorage from 'Embark/contracts/SimpleStorage';

SimpleStorage.methods.set(100).send();
SimpleStorage.methods.get().call().then(function(value) { console.log(value) });
SimpleStorage.methods.storedData().call().then(function(value) { console.log(value) });

The syntax used is web3.js 1.2.6