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The Polywrap project folder

Once you have your project set up, the folder tree should look something like this:

polywrap.yaml # Manifest File
โ”‚ โ”œโ”€โ”€ index.ts # Entry point, exports methods defined in schema
โ”‚ |โ”€โ”€ schema.graphql/ # Schema
| โ””โ”€โ”€ contracts/ # Smart Contracts
workflows/ # Job definitions (described below)
scripts/ # Smart Contract Build/Deploy


The polywrap.yaml is a manifest file describing the layout of a Polywrap Wasm wrapper.


Each wrapper project has a Wrapper Schema. The schema defines the wrapper's dependencies, methods, and custom types. In short, it's an interface describing how to use the wrapper.


The index.ts file exports the wrapper's method's implementations, which contain the wrapper's logic.


The src/contracts directory contains our protocol's Ethereum-based smart contracts.


Workflows provide a simple way to test your Polywrap without having to write custom testing logic (with JavaScript and Jest, for example).

We'll be using this functionality further down in this guide with the polywrap run command, allowing us to easily send test queries against our API.


We've defined some simple build & deployment scripts for our Solidity smart contracts. These are basic utilities, and can be replaced entirely by a Truffle or Hardhat project.

In the next section, we'll build this example Wasm wrapper and see what gets outputted in the build folder!