Nanotech Parading Mars

    @unipeer/buidler-typechain
    TypeScript icon, indicating that this package has built-in type declarations

    0.1.9 • Public • Published

    buidler

    buidler-typechain

    Better integration with buidler builtin tasks!

    Add Typechain tasks to your Buidler project!

    What

    TypeChain gives you Typescript bindings for your smart contracts. Now, your tests and frontend code can be typesafe and magically autocomplete smart contract function names!

    Installation

    npm i @unipeer/buidler-typechain typechain ts-generator

    And add the following statement to your buidler.config.js:

    usePlugin("@unipeer/buidler-typechain");

    Tasks

    This plugin adds the typechain task to Buidler:

    Generate Typechain typings for compiled contracts
    

    Configuration

    This plugin extends the BuidlerConfig optional typechain object. The object contains two fields, outDir and target. outDir is the output directory of the artifacts that TypeChain creates (defaults to typechain). target is one of the targets specified by the TypeChain docs (defaults to ethers).

    You can also configure this plugin to automatically run after ever compile or test command by setting the onTest or onCompile fields to true. onTest is by default set to true and is recommended to avoid any frustrations in case where you forget to re-generate types after updating a contract and your tests are out of sync with your contract code.

    This is an example of how to set it:

    module.exports = {
      typechain: {
        outDir: "src/types",
        target: "ethers-v5",
        onTest: true,
        onCompile: false
      },
    };

    Usage

    npx buidler typechain - Compiles and generates Typescript typings for your contracts.

    Example Waffle + Ethers test that uses typedefs for contracts:

    import { ethers } from "@nomiclabs/buidler";
    import chai from "chai";
    import { Wallet } from "ethers";
    import { deployContract, solidity } from "ethereum-waffle";
    
    import CounterArtifact from "../artifacts/Counter.json";
    import { Counter } from "../typechain/Counter";
    
    chai.use(solidity);
    const { expect } = chai;
    
    describe("Counter", () => {
      let counter: Counter;
    
      beforeEach(async () => {
        // 1
        const signers = await ethers.signers();
    
        // 2
        counter = (await deployContract(
          <Wallet>signers[0],
          CounterArtifact
        )) as Counter;
        const initialCount = await counter.getCount();
    
        // 3
        expect(initialCount).to.eq(0);
        expect(counter.address).to.properAddress;
      });
    
      // 4
      describe("count up", async () => {
        it("should count up", async () => {
          await counter.countUp();
          let count = await counter.getCount();
          expect(count).to.eq(1);
        });
      });
    
      describe("count down", async () => {
        // 5
        it("should fail", async () => {
          await counter.countDown();
        });
    
        it("should count down", async () => {
          await counter.countUp();
    
          await counter.countDown();
          const count = await counter.getCount();
          expect(count).to.eq(0);
        });
      });
    });

    See this starter kit for a full example!

    TypeScript support

    You need to add this to your tsconfig.json's files array: "node_modules/@unipeer/buidler-typechain/src/type-extensions.d.ts"

    Install

    npm i @unipeer/buidler-typechain

    DownloadsWeekly Downloads

    1

    Version

    0.1.9

    License

    MIT

    Unpacked Size

    20.7 kB

    Total Files

    27

    Last publish

    Collaborators

    • shalzz