Lucid

Lucid is a library designed to simplify creating Cardano transactions and writing off-chain code for Plutus contracts.

Get started

Deno 🦕

import { Lucid } from "jsr:@spacebudz/lucid";

or

import { Lucid } from "https://deno.land/x/lucid/mod.ts";

Node.js

npx jsr add @spacebudz/lucid

or

npm install lucid-cardano (legacy, will likely be obsolete)

--experimental-wasm-modules flag needs to be set in Node.js as well as { "type": "module" } in package.json

Build from source

Build for NPM

deno task build

Outputs a dist folder

Examples

• Basic examples

Basic usage

import { Blockfrost, Lucid } from "https://deno.land/x/lucid/mod.ts";

const lucid = new Lucid({
  provider: new Blockfrost(
    "https://cardano-preview.blockfrost.io/api/v0",
    "<projectId>",
  ),
});

// Assumes you are in a browser environment
const api = await window.cardano.nami.enable();
lucid.selectWalletFromApi(api);

const tx = await lucid.newTx()
  .payTo("addr...", { lovelace: 5000000n })
  .commit();

const signedTx = await tx.sign().commit();

const txHash = await signedTx.submit();

console.log(txHash);

Blueprint

Lucid supports CIP-0057 blueprints.

Run the following command in a directory with a plutus.json file.

deno run -A https://deno.land/x/lucid/blueprint.ts

You can import the example Aiken validator…

pub type MyData {
  a: Int,
  b: ByteArray,
}

validator validate(my_data: MyData) {
  mint(redeemer: MyData, _policy_id: PolicyId, _transaction: Transaction) {
    my_data == redeemer
  } 
}

…into Lucid using the generated plutus.ts file created with the blueprint command, as shown below:

import { ValidateMint } from "./plutus.ts";

const validator = new ValidateMint({ a: 123n, b: "0000" });

const policyId = lucid.newScript(validator).toHash();

const tx = await lucid
  .newTx()
  .mint(
    { [policyId]: 1n },
    Data.to({ a: 123n, b: "0000" }, ValidateMint.redeemer),
  )
  .attachScript(validator)
  .commit();

See more examples

Instructions

Lucid transactions can be converted into instructions, which are JSON, making them highly portable.

const instructions = await lucid.newTx()
  .delegateTo("{{own}}", { Pool: "pool..." })
  .payTo("addr_test1...", { lovelace: 1000000n })
  .toInstructions();

The above transaction can be converted into the following object:

[
  {
    "type": "DelegateTo",
    "delegation": {
      "rewardAddress": "stake...",
      "variant": {
        "Pool": "pool...",
      },
    },
    "redeemer": undefined,
  },
  {
    "type": "PayTo",
    "address": "addr_test1...",
    "assets": { "lovelace": 1000000n },
  },
]

Consume the instructions in Lucid:

const tx = await lucid.fromInstructions([
  {
    "type": "DelegateTo",
    "delegation": {
      "rewardAddress": "stake...",
      "variant": {
        "Pool": "pool...",
      },
    },
    "redeemer": undefined,
  },
  {
    "type": "PayTo",
    "address": "addr_test1...",
    "assets": { "lovelace": 1000000n },
  },
]);

You can avoid address resolution if you use .toPartialInstructions() instead of .toInstructions().
Then Lucid will resolve {{own}} fields with the addresses of the selected wallet during consumption of instructions.

Test

deno task test

Build Core

The core library (instruction builder, crypto, hashing etc.) is written in Rust and compiled to WASM.

deno task build:core

Test Core

deno task test:core

Docs

You can generate documentation with:

deno doc

Compatibility

Lucid is an ES Module, and to use it in the browser, a bundler that supports top-level await and WebAssembly is recommended. If you use Webpack 5 enable in the webpack.config.js:

experiments: {
    asyncWebAssembly: true,
  }

Contributing

Contributions and PRs are welcome
The contribution instructions.

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