Typescript constructor arguments get thrown away (with example repo)

[tobyhinloopen]

Describe the bug

Storybookjs's standard out-of-the-box compiler configuration for react typescript applications incorrectly compile Typescript code by removing some constructor bodies. Specifically, my class:

my time.ts class

export class Time {
  constructor(private time = 0) {
  }

  now() {
    this.time = (this.time || 0) + 1;
    return this.time;
  }
}

is compiled to:

BROKEN JS code as generated by storybookjs

var Time = /*#__PURE__*/function () {
  function Time() {
    var time = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 0;

    _classCallCheck(this, Time);
  }

  _createClass(Time, [{
    key: "now",
    value: function now() {
      this.time = (this.time || 0) + 1;
      return this.time;
    }
  }]);

  return Time;
}();

Note how this.time = time is missing. The correct JS code should be something like:

CORRECT JS code as generated by default typescript compiler

export class Time {
    constructor(time = 0) {
        this.time = time;
    }
    now() {
        this.time = (this.time || 0) + 1;
        return this.time;
    }
}

To Reproduce

• Checkout my example repo here: https://github.com/charperbonaroo/sb-breaks-constructor
• npm run storybook
• Visit http://localhost:6006/?path=/story/example-now--primary

Expected behavior

• The shown source should somehow set this.time to time
• It should say This: 9001 should be 9001.

System

Environment Info:

  System:
    OS: Windows 10 10.0.19041
    CPU: (8) x64 Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
  Binaries:
    Node: 15.11.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.10 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 7.6.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 89.0.4389.114
    Edge: Spartan (44.19041.423.0), Chromium (89.0.774.68)
  npmPackages:
    @storybook/addon-actions: ^6.2.5 => 6.2.5
    @storybook/addon-essentials: ^6.2.5 => 6.2.5
    @storybook/addon-links: ^6.2.5 => 6.2.5
    @storybook/react: ^6.2.5 => 6.2.5

[tannerlyons]

Seems like a dupe of #12019

[tobyhinloopen]

It is