# 09. Lint and Build Setup

In this chapter, we will go over how to set up npm lint and build scripts to lint our code and output our build to files.

# Linting

To ensure code quality, we can set up a lint script.

We already have ESLint and Prettier integrated into our project, so we can simply call ESLint CLI; for TypeScript project, we additionally call TypeScript compiler to type check.

Putting them together and add a lint script to our package.json:

{
    "scripts": {
        "lint": "tsc -p . --noEmit && eslint --ext .ts src/"
        // ...
    }
    // ...
}

{
    "scripts": {
        "lint": "eslint --ext .mjs src/"
        // ...
    }
    // ...
}

You can lint your project code by executing lint script using terminal or IDE npm script integration:

npm run lint

# Building

buildOutput already contains built files as well as hash, all we need to do is to simply write them to disk so they can be served.

We create src/build.ts which outputs the files:

import { writeFileSync } from 'fs'
import { buildOutput } from '.'

writeFileSync('EngineConfiguration', buildOutput.engine.configuration.buffer)
writeFileSync('EngineData', buildOutput.engine.data.buffer)
writeFileSync('LevelData', buildOutput.level.data.buffer)

import { writeFileSync } from 'fs'
import { buildOutput } from './index.mjs'

writeFileSync('EngineConfiguration', buildOutput.engine.configuration.buffer)
writeFileSync('EngineData', buildOutput.engine.data.buffer)
writeFileSync('LevelData', buildOutput.level.data.buffer)

Normally the level data is not needed as we are developing an engine, however in this guide we are going to output it so we can test it in a real production server as well.

Lastly, we add it as a build script to our package.json:

{
    "scripts": {
        "build": "ts-node ./src/build"
        // ...
    }
    // ...
}

{
    "scripts": {
        "build": "node ./src/build.mjs"
        // ...
    }
    // ...
}

You can build your project by executing build script using terminal or IDE npm script integration:

npm run build