jscodemod-import-statistics

jscodemod-import-statistics.js

const fs = require('fs');
const crypto = require('crypto');

module.exports = function transformer(file, api, options) {
  const j = api.jscodeshift;
  const importSource = options.importSource || '';
  const importInstances = [];

  j(file.source)
    .find(j.ImportDeclaration)
    .forEach(path => {
      if (
        path.node.source.type === "Literal" &&
        path.node.source.value.indexOf(importSource) !== -1
      ) {
        path.node.specifiers.forEach(specifier => {
          if (specifier.type === "ImportNamespaceSpecifier") {
            importInstances.push('*');
          }

          if (specifier.imported && specifier.imported.type === "Identifier") {
            importInstances.push(specifier.imported.name);
          }

          if (specifier.type === "ImportDefaultSpecifier") {
            importInstances.push(specifier.local.name);
          }
        });
      }
    });

    const uniqId = crypto.randomBytes(16).toString('hex');
    fs.writeFileSync(`./out/out-${uniqId}.json`, JSON.stringify(importInstances));
    return null;
}