@graffy/stream/cjs/mapStream.js

Utility for creating AsyncIterables (streams) from any callback-based

"use strict";

var _interopRequireDefault = require("@babel/runtime-corejs3/helpers/interopRequireDefault");

exports.__esModule = true;
exports.default = mapStream;

var _makeStream = _interopRequireDefault(require("./makeStream"));

function mapStream(stream, fn) {
  return (0, _makeStream.default)(function (push, end) {
    var next = function next() {
      stream.next().then(function (_ref) {
        var value = _ref.value,
            done = _ref.done;
        if (done) return end();
        push(fn(value));
        next();
      }).catch(function (error) {
        return end(error);
      });
    };

    next();
    return function (error, value) {
      error ? stream.throw(error) : stream.return(value);
    };
  });
}

module.exports = exports.default;