empty network events in contract builds

[willli666]

• [x ] I've asked for help in the Truffle Gitter before filing this issue.

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Issue

events field is always empty in deployed contract's json file.

Steps to Reproduce

1. Open any contract and define an event there
   in my case I simply use the TutorialToken example like this. This token contract has multiple events defined in its dependency

import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
contract TutorialToken is ERC20 {
    string public name = "TutorialToken";
    string public symbol = "TT";
    uint8 public decimals = 2;
    uint public INITIAL_SUPPLY = 12000;
    constructor() public {
        _mint(msg.sender, INITIAL_SUPPLY);
    }
}

2. Deploy this contract in truffle develop

truffle develop
compile
migrate 

3. Exam the build/contracts/TutroialToken.json file. Under networks section, I see the following

  "networks": {
    "5777": {
      "events": {},
     .....

4. RE-deploy the same contract in truffle develop

migrate --reset

Now exam the same TutroialToken.json file, the events are populated.

Expected Behavior

The events section should not be empty {} after the first deployment. It should not require another deployment to make it show up.

Environment

• Operating System: Mac
  Truffle v5.0.27 (core: 5.0.27)
  Solidity - 0.4.24 (solc-js)
  Node v10.15.0

[xuhuang37]

I have the same issue.

[fainashalts]

@tjlian616 and @xuhuang37 thank you for bringing this issue to our attention. It does seem that this is not expected behavior. We will look into it!

[miyao-gmo]

@fainashalts truffle-contract has the events porperties, but the events properties is the function which calculates events' signature. Therefore, networks.events is empty until contract calls the events property.