@mapbox/batfish/dist/node/write-data-modules.js

The React-powered static-site generator you didn't know you wanted

//      
'use strict';

const _ = require('lodash');
const fs = require('fs');
const path = require('path');
const pify = require('pify');
const mkdirp = require('mkdirp');
const chalk = require('chalk');
const pTry = require('p-try');
const constants = require('./constants');
const errorTypes = require('./error-types');

// Write the return value of each data selector to a module in the data
// subdirectory of the temporary directory. This directory is aliased by Webpack
// so these modules can be imported from `@mapbox/batfish/data/*`.
//
// Return Promise resolves with an array of filenames for the data modules that
// were written.
function writeDataModules(
  batfishConfig                      ,
  siteData                 
)                         {
  return pTry(() => {
    const dataOutputDirectory = path.join(
      batfishConfig.temporaryDirectory,
      constants.DATA_DIRECTORY
    );

    // Returned Promise resolves with the filename of the data module.
    const createSingleDataModule = (
      dataSelector                                ,
      id        
    )                  => {
      const data = dataSelector(siteData);

      let dataString;
      try {
        dataString = JSON.stringify(data);
      } catch (jsonParseError) {
        throw new errorTypes.ConfigFatalError(
          `Could not parse return value of data selector ${chalk.yellow(
            id
          )} as JSON. Data selectors must return JSON.`
        );
      }

      const code = `module.exports = ${dataString};`;
      const filename = path.join(dataOutputDirectory, `${_.kebabCase(id)}.js`);
      return pify(fs.writeFile)(filename, code).then(() => filename);
    };

    if (!batfishConfig.dataSelectors) {
      return [];
    }
    return pify(mkdirp)(dataOutputDirectory).then(() => {
      return Promise.all(
        _.map(batfishConfig.dataSelectors, createSingleDataModule)
      );
    });
  });
}

module.exports = writeDataModules;