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## @0xproject/subproviders
A few useful web3 subproviders including a LedgerSubprovider useful for adding Ledger Nano S support.
We have written up a [Wiki](https://0xproject.com/wiki#Web3-Provider-Examples) article detailing some use cases of this subprovider package.
### Read the [Documentation](0xproject.com/docs/subproviders).
## Installation
```
yarn add @0xproject/subproviders
```
If your project is in [TypeScript](https://www.typescriptlang.org/), add the following to your `tsconfig.json`:
```json
"compilerOptions": {
"typeRoots": ["node_modules/@0xproject/typescript-typings/types", "node_modules/@types"],
}
```
## Contributing
We welcome improvements and fixes from the wider community! To report bugs within this package, please create an issue in this repository.
Please read our [contribution guidelines](./CONTRIBUTING.md) before getting started.
### Install dependencies
If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
```bash
yarn config set workspaces-experimental true
```
Then install dependencies
```bash
yarn install
```
### Build
If this is your **first** time building this package, you must first build **all** packages within the monorepo. This is because packages that depend on other packages located inside this monorepo are symlinked when run from **within** the monorepo. This allows you to make changes across multiple packages without first publishing dependent packages to NPM. To build all packages, run the following from the monorepo root directory:
```bash
yarn lerna:rebuild
```
Or continuously rebuild on change:
```bash
yarn dev
```
You can also build this specific package by running the following from within its directory:
```bash
yarn build
```
or continuously rebuild on change:
```bash
yarn build:watch
```
### Clean
```bash
yarn clean
```
### Lint
```bash
yarn lint
```
### Run tests
#### Unit tests
```bash
yarn run test:unit
```
#### Integration tests
In order to run the integration tests, make sure you have a Ledger Nano S available.
* Setup your Ledger with the development mnemonic seed: `concert load couple harbor equip island argue ramp clarify fence smart topic`
* Plug it into your computer
* Unlock the device
* Open the on-device Ethereum app
* Make sure "browser support" and "contract data" are disabled
* Start [TestRPC](https://github.com/trufflesuite/ganache-cli) locally at port `8545`
Then run:
```
yarn test:integration
```
**Note:** We assume a derivation path of `m/44'/60'/0'/0` which is already configured in the tests. With this setup and derivation path, your first account should be `0x5409ed021d9299bf6814279a6a1411a7e866a631`, exactly like TestRPC.
#### All tests
```bash
yarn run test:all
```
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