How to generate types.json in substrate

Question

In polkadot-js has provided for developer to define custom types in the pallet, so that polkadot-ui can understand those types (it means can use some underlying API polkadot-js). These types are defined using the json format. This is example

{
  "TransactionInput": {
    "parent_output": "Hash",
    "signature": "Signature"
  },
  "TransactionOutput": {
    "value": "u128",
    "pubkey": "Hash",
    "sale": "u32"
  },
  "Transaction": {
    "inputs": "Vec<TransactionInput>",
    "outputs": "Vec<TransactionOutput>"
  }
}

I see that in substrate-node-template/scripts has aggregrate_types.js file that generate types.json. I dont know how to generate it automaticly or I should write by hand. Example that, in my pallet that i have defined enum RoleID and struct Role. But in UI it doesn't understand what RoleID is. Can you explain more clearly? I believe that it can be related to define types.json. https://github.com/polkadot-js/apps/blob/master/packages/page-settings/src/md/basics.md#developer

aggregrate_types.json:

Thanks!!!

I don't see the `aggregrate_types.js` you mention [here](https://github.com/paritytech/substrate/tree/master/bin/node-template/scripts) - can you point that out? — Nuke, Jul 22 '21 at 16:57
Thanks for reply!!! aggregrate_types.js that i mention in susbtrate-node-template. Yeah when i check in github they delete this file. But in some previous commit, they have — CocDap, Jul 22 '21 at 17:19
@NukeManDan The aggregate_type.js script can be found here: https://github.com/substrate-developer-hub/recipes/search?q=filename%3Aaggregate_types.js — btwiuse, Aug 08 '21 at 09:18

score 1 · Answer 1 · answered Jul 22 '21 at 17:00

1

Presently, generating this by hand is the best way following the docs here. There are not clean ways to automatically generate this to my knowlage, but soon you will not need to worry about at all it once this PR lands in Substrate!

answered Jul 22 '21 at 17:00

Nuke

1,032
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13

score 0 · Answer 2 · answered Jan 02 '22 at 16:14

Thanks to https://github.com/paritytech/substrate/pull/8615, you don't have to manually write types.json anymore.

Make sure the metadata version of your node is v14 or higher. Otherwise you need to upgrade your substrate version to make it automagically work for you.

How to generate types.json in substrate

2 Answers2