docs/src/pages/index.jsx

import React from 'react'
import PropTypes from 'prop-types'
import { Link, graphql } from 'gatsby'
import classnames from 'classnames'
import SEO from '../components/Seo'
import Layout from '../components/Layout'
import Content from '../components/Content'
import HeaderHome from '../components/HeaderHome'
import Repositories from '../components/Repositories'
import { ReactComponent as Arrow } from '../images/arrow.svg'
import styles from './index.module.scss'

const SectionBox = ({ to, children, ...props }) =>
    to ? (
        <Link to={to} {...props}>
            {children}
        </Link>
    ) : (
        <div {...props}>{children}</div>
    )

SectionBox.propTypes = {
    to: PropTypes.string.isRequired,
    children: PropTypes.any.isRequired
}

const SectionLink = ({ to, title, color, children }) => {
    // eslint-disable-next-line
    let classNames = classnames(styles.link, {
        [styles.purple]: color === 'purple',
        [styles.blue]: color === 'blue',
        [styles.orange]: color === 'orange',
        [styles.green]: color === 'green'
    })

    return (
        <SectionBox to={to} className={classNames}>
            <h3 className={styles.sectionTitle}>{title}</h3>
            <p className={styles.sectionText}>{children}</p>
            {title !== 'API References' && (
                <span className={styles.sectionMore}>
                    Learn More <Arrow />
                </span>
            )}
        </SectionBox>
    )
}

SectionLink.propTypes = {
    to: PropTypes.string.isRequired,
    title: PropTypes.string.isRequired,
    color: PropTypes.string,
    children: PropTypes.any
}

const IndexPage = ({ data, location }) => (
    <>
        <SEO />

        <Layout location={location} header={<HeaderHome />}>
            <Content>
                <ul className={styles.sections}>
                    {data.allSectionsYaml.edges.map(({ node }) => (
                        <li key={node.title} className={styles.section}>
                            <SectionLink
                                to={node.link}
                                title={node.title}
                                color={node.color}
                            >
                                {node.description}
                            </SectionLink>
                        </li>
                    ))}
                </ul>

                <Repositories />
            </Content>
        </Layout>
    </>
)

IndexPage.propTypes = {
    data: PropTypes.object.isRequired,
    location: PropTypes.object.isRequired
}

export default IndexPage

export const IndexQuery = graphql`
    query {
        site {
            siteMetadata {
                siteDescription
            }
        }

        allSectionsYaml {
            edges {
                node {
                    title
                    description
                    link
                    color
                }
            }
        }
    }
`