@59naga/babel-plugin-transform-array-from/lib/index.js

replace `Array.from` with an ponyfill function

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _babelTemplate = require('babel-template');

var _babelTemplate2 = _interopRequireDefault(_babelTemplate);

var _fs = require('fs');

var _fs2 = _interopRequireDefault(_fs);

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

// private
// dependencies
var polyfill = _fs2.default.readFileSync(require.resolve('@59naga/array.from/polyfill.js'), 'utf8');
var polyfillWithoutExport = polyfill.slice(polyfill.indexOf('('));
var defineName = '_arrayFrom';

/**
* @module babel-plugin-transform-array-from
* @returns {babelPlugin} unknown
*/

exports.default = function () {
  return {
    visitor: {
      CallExpression: function CallExpression(path) {
        if (path.get('callee').matchesPattern('Array.from')) {
          path.replaceWith((0, _babelTemplate2.default)(defineName + '($0)')(path.node.arguments));
        }
      },

      Program: {
        exit: function exit(path) {
          var _iteratorNormalCompletion = true;
          var _didIteratorError = false;
          var _iteratorError = undefined;

          try {
            for (var _iterator = path.node.body[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
              var node = _step.value;

              var declaration = (node.declarations || [])[0] || {};
              var name = declaration.id && declaration.id.name;
              if (name === defineName) {
                return;
              }
            }
          } catch (err) {
            _didIteratorError = true;
            _iteratorError = err;
          } finally {
            try {
              if (!_iteratorNormalCompletion && _iterator.return) {
                _iterator.return();
              }
            } finally {
              if (_didIteratorError) {
                throw _iteratorError;
              }
            }
          }

          var topNodes = [];
          topNodes.push((0, _babelTemplate2.default)('var ' + defineName + ' = Array.from || ' + polyfillWithoutExport)());
          path.unshiftContainer('body', topNodes);
        }
      }
    }
  };
};

module.exports = exports['default'];
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