lib/config/config-schema.js

import Joi from 'joi';

const middlewareOrLifecycleSchema = Joi.alternatives()
  .try(Joi.string(), Joi.func(), Joi.array().items(Joi.string(), Joi.func()))
  .default([]);

const regExpSchema = Joi.object().type(RegExp);

export default Joi.object({
  site: Joi.object().default(),
  path: Joi.object({
    source: Joi.string().default('./'),
    destination: Joi.string().default('./_site'),
    templates: Joi.string().default('./_templates'),
    data: Joi.string().default('./_data'),
  }).default(),
  file: Joi.object({
    urlKey: Joi.string().default('url'),
    dateFormat: Joi.string().default('YYYY-M-D'),
    defaults: Joi.array()
      .items(
        Joi.object({
          scope: Joi.object({
            path: Joi.string().allow(''),
            metadata: Joi.object(),
          }),
          values: Joi.object(),
        })
      )
      .default([]),
    filters: Joi.object({
      metadata: Joi.object(),
      futureDate: Joi.object({
        key: Joi.string().default('date'),
      }),
    }).default({}),
  }).default(),
  collections: Joi.object().pattern(
    /\w/,
    Joi.object({
      path: Joi.string(),
      metadata: Joi.string(),
      template: Joi.string().default('index'),
      pageSize: Joi.number().default(6),
      sort: Joi.object({
        key: Joi.string().default('date'),
        order: Joi.string().default('descending'),
      }),
      permalink: Joi.object({
        index: Joi.string().default('/'),
        page: Joi.string().default('/page/:page/'),
      }),
    }).without('path', 'metadata')
  ),
  assets: Joi.array()
    .items(
      Joi.object({
        test: Joi.alternatives().try(Joi.string(), Joi.func(), regExpSchema),
        use: Joi.alternatives().try(
          Joi.string(),
          Joi.object({
            calculateDestination: Joi.func().required(),
            render: Joi.func().required(),
          })
        ),
      })
    )
    .default([
      { test: /\.less$/, use: 'less' },
      { test: /\.js$/, use: 'browserify' },
      { test: /\.s[ac]ss$/, use: 'sass' },
    ]),
  cleanDestination: Joi.boolean().default(false),
  slug: Joi.object({
    lower: Joi.boolean().default(true),
  }).default(),
  markdown: Joi.object({
    extensions: Joi.array().default([
      'markdown',
      'mkdown',
      'mkdn',
      'mkd',
      'md',
    ]),
    options: Joi.object({
      preset: Joi.string().default('commonmark'),
      highlight: Joi.any()
        .valid('prism', 'highlightjs', true, false)
        .default(true),
    })
      .unknown(true)
      .default(),
  }).default(),
  server: Joi.object({
    port: Joi.number().default(8080),
    host: Joi.string().default('127.0.0.1'),
    baseurl: Joi.string()
      .allow('')
      .default(''),
  }).default(),
  ignore: Joi.array()
    .items(Joi.string(), Joi.func(), regExpSchema)
    .default([]),
  incremental: Joi.boolean().default(true),
  newFilePermalink: Joi.string().default(
    '/_posts/:date|YYYY-:date|MM-:date|D-:title.md'
  ),
  middlewares: middlewareOrLifecycleSchema,
  lifecycle: Joi.object({
    willUpdate: middlewareOrLifecycleSchema,
    didUpdate: middlewareOrLifecycleSchema,
    willBuild: middlewareOrLifecycleSchema,
    didBuild: middlewareOrLifecycleSchema,
  }).default(),
}).default();