nuclide-format-js/lib/common/requires/removeUnusedTypes.js

A collection of codemods to help auto format javascript

'use strict';

var _getDeclaredIdentifiers = require('../utils/getDeclaredIdentifiers');

var _getDeclaredIdentifiers2 = _interopRequireDefault(_getDeclaredIdentifiers);

var _getDeclaredTypes = require('../utils/getDeclaredTypes');

var _getDeclaredTypes2 = _interopRequireDefault(_getDeclaredTypes);

var _getNonDeclarationTypes = require('../utils/getNonDeclarationTypes');

var _getNonDeclarationTypes2 = _interopRequireDefault(_getNonDeclarationTypes);

var _isGlobal = require('../utils/isGlobal');

var _isGlobal2 = _interopRequireDefault(_isGlobal);

var _isTypeImport = require('../utils/isTypeImport');

var _isTypeImport2 = _interopRequireDefault(_isTypeImport);

var _jscodeshift = require('jscodeshift');

var _jscodeshift2 = _interopRequireDefault(_jscodeshift);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/*
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the license found in the LICENSE file in
 * the root directory of this source tree.
 *
 * 
 */

var match = _jscodeshift2.default.match;


// These are the things we should try to remove.
var CONFIG = [
// import type Foo from 'Foo';
{
  nodeType: _jscodeshift2.default.ImportDeclaration,
  filters: [_isGlobal2.default, _isTypeImport2.default],
  getNames: function getNames(node) {
    return node.specifiers.map(function (specifier) {
      return specifier.local.name;
    });
  }
}, {
  nodeType: _jscodeshift2.default.ImportSpecifier,
  filters: [function (path) {
    return (0, _isGlobal2.default)(path.parent) && (0, _isTypeImport2.default)(path.parent);
  }],
  getNames: function getNames(node) {
    return [node.local.name];
  }
}];

function removeUnusedTypes(root, options) {
  var declared = (0, _getDeclaredIdentifiers2.default)(root, options);
  var used = (0, _getNonDeclarationTypes2.default)(root);
  var nonTypeImport = (0, _getDeclaredTypes2.default)(root, options, [function (path) {
    return !isTypeImportDeclaration(path.node);
  }]);
  // Remove things based on the config.
  CONFIG.forEach(function (config) {
    root.find(config.nodeType).filter(function (path) {
      return config.filters.every(function (filter) {
        return filter(path);
      });
    }).filter(function (path) {
      return config.getNames(path.node).every(function (name) {
        return !used.has(name) || declared.has(name) || nonTypeImport.has(name);
      });
    }).map(function (x) {
      console.log(x);
      return x;
    }).remove();
  });
}

function isTypeImportDeclaration(node) {
  return match(node, {
    type: 'ImportDeclaration',
    importKind: 'type'
  });
}

module.exports = removeUnusedTypes;
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