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@julclang/joust

v0.1.0-pre1-rc9

Published

JOUST for JavaScript developers: build Cardano state contracts written in Java (.java) or JOUST's DSL (.jsc) with npm only, no JDK or GraalVM (ADR-0015)

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@julclang/joust

JOUST for JavaScript and TypeScript developers (ADR-0015): Cardano state contracts written in Java (.java) or JOUST's DSL (.jsc), built with npm only. No JDK, JRE or GraalVM: the compiler runs as a Wasm engine.

npm create joust my-app && cd my-app && npm install
npx joust build      # contracts/ -> build/joust/ (validators, descriptions, typed clients, contracts.json)
npx joust deploy     # publishes the reference scripts; writes build/joust/deployments.<network>.json

joust dev

npx joust dev                      # Yaci DevKit (Yaci Store's Blockfrost-compatible API), the default network
BLOCKFROST_PREVIEW_PROJECT_ID=... JOUST_MNEMONIC='...' npx joust dev --network preview

joust dev attaches to the network's chain, builds, deploys, and then rebuilds and redeploys whenever a contract is saved. It serves the page (with Vite when the project has it) and, for the page:

| Path | What it serves | |---|---| | /chain/... | the network's chain API, proxied. A Blockfrost project id stays in the dev server and never reaches the page. | | /joust/network.json | the network, its slot clock and the current deployments | | /joust/... | the build (contracts.json, clients, deployments) | | /dev/topup | on a DevKit, funds a page's wallet: POST { address, ada } |

A DevKit network may name a start command in joust.config.json (for example "yaci-devkit up --enable-yaci-store") for joust dev to run when the DevKit is not up.

Networks

joust.config.json names the networks; devkit and preview are built in:

| Network | Chain API | Credentials | |---|---|---| | devkit | Yaci Store, http://localhost:8080/api/v1 | none; admin API http://localhost:10000 | | preview | Blockfrost preview | the project id from BLOCKFROST_PREVIEW_PROJECT_ID; the deployer from JOUST_MNEMONIC |

Any Blockfrost-compatible API works through "chain", with "projectIdEnv" naming the variable that holds its project id. A project id is never read from the config file itself. Ogmios works with "provider": "ogmios" and "ogmios": url (no history, so MerkleMaps built elsewhere cannot be rebuilt from it alone).

Calls are made with @julclang/joust-runtime. Node 22 or later.