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@hyperionbt/helios
Advanced tools
Helios is a Domain Specific Language that compiles to Plutus-Core (i.e. Cardano on-chain validator scripts). Helios is a non-Haskell alternative to Plutus. This library contains a reference compiler for Helios, as well as transaction building functions.
Helios is a Domain Specific Language that compiles to Plutus-Core (i.e. Cardano on-chain validator scripts). Helios is a non-Haskell alternative to Plutus.
Helios is purely functional, strongly typed, and has a simple curly braces syntax. It notably supports closures, compile-time evaluation, and enums as tagged unions.
The Helios library contains a reference compiler for the Helios language, as well as transaction building functions. Everything is written in Javascript.
Use the following tutorial to learn how to use Helios with cardano-cli:
We are in the process of migrating these tutorials here. There is an online coding playground.
The following Helios example is equivalent to the Plutus vesting contract from the Plutus playground:
spending vesting
struct VestingTranche {
time: Time // 'amount' is available after 'time'
amount: Value
func available_from(self, time: Time) -> Value {
if (time >= self.time) {
self.amount
} else {
Value::ZERO
}
}
func remaining_from(self, time: Time) -> Value {
self.amount - self.available_from(time)
}
}
struct VestingParams {
tranche1: VestingTranche
tranche2: VestingTranche
owner: PubKeyHash
func remaining_from(self, time: Time) -> Value {
self.tranche1.remaining_from(time) + self.tranche2.remaining_from(time)
}
}
const PARAMS: VestingParams = VestingParams{
/*parameters interpolated from surrounding js*/
}
// the compiler is smart enough to add an empty Datum and empty Redeemer as arguments to the actual main entrypoint function
func main(ctx: ScriptContext) -> Bool {
tx: Tx = ctx.tx;
now: Time = tx.now();
remaining_actual: Value = tx.value_locked_by(ctx.get_current_validator_hash());
remaining_expected: Value = PARAMS.remaining_from(now);
remaining_actual >= remaining_expected && tx.is_signed_by(PARAMS.owner)
}
You can compile this source into Plutus-Core using the helios.js
library:
import * as helios from "helios.js"
const src = `struct VestingTranche {
...
...
`;
console.log(helios.Program.new(src).compile().serialize());
// the output can be saved to a file, and that file can be used directly by cardano-cli
You can explore this example on the Helios playground.
import * as helios from "helios.js"
const plutusCoreJson = `{"type": "PlutusScriptV1", ...}`;
// dump Plutus-Core AST
console.log(helios.deserializePlutusCore(plutusCoreJson));
Can be found here.
FAQs
Helios is a Domain Specific Language that compiles to Plutus-Core (i.e. Cardano on-chain validator scripts). Helios is a non-Haskell alternative to Plutus. With this library you can compile Helios scripts and build Cardano transactions, all you need to bu
The npm package @hyperionbt/helios receives a total of 48 weekly downloads. As such, @hyperionbt/helios popularity was classified as not popular.
We found that @hyperionbt/helios demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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