.eleventy.js

const fs = require('fs').promises;
const { handleGitIgnore } = require('./src/gitignore');
const { handleNetlifyToml } = require('./src/netlify');
const { handlePackageJson } = require('./src/package');

module.exports = function(config, pluginOptions) {
  pluginOptions = Object.assign({
    slugToImageDataMappingFile: 'resoc-image-data.json',
    openGraphBasePath: '/social-images',
    templatesDir: 'resoc-templates',
    patchNetlifyToml: false
  }, pluginOptions);

  const imgData = {};

  config.on('beforeBuild', async () => {
    handleGitIgnore(pluginOptions.slugToImageDataMappingFile);
  });

  config.addShortcode('resoc', ({ ...options } ) => {
    imgData[options.slug] = {
      template: options.template,
      values: options.values
    };
    return `${pluginOptions.openGraphBasePath}/${options.slug}.jpg`;
  });

  config.on('afterBuild', async () => {
    if (!await handleNetlifyToml(pluginOptions)) {
      throw 'Please fix your Netlify configuration';
    }
    if (!await handlePackageJson()) {
      throw 'Please install the Resoc social image Netlify build plugin';
    }

    await fs.writeFile(
      pluginOptions.slugToImageDataMappingFile,
      JSON.stringify(imgData)
    );
  });
}