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[TypeScript] Parameter decorators in constructors with public/private modifier removes imports #9838

jezzgoodwin opened this Issue Apr 9, 2019 · 1 comment


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commented Apr 9, 2019

Bug Report

Current Behavior
When using parameter decorators in class constructors combined with the public or private keyword, Babel loses the import information.

If public/private is not used, it works correctly.

This is a similar issue to #8634 but specifically regarding the use of public/private.

Input Code

import { inject } from "./inject";
import { UserService } from "./UserService";

export class Store {
    constructor(@inject(UserService) private userService: UserService) {}

Expected behavior/code
I would expect an output along the lines of:

Object(_includes__WEBPACK_IMPORTED_MODULE_1__["inject"])(_PageStore__WEBPACK_IMPORTED_MODULE_2__["UserService"])(Store.prototype, "", 0);

But what I get is:

inject(UserService)(Store.prototype, "", 0);

Which doesn't work because inject and UserService aren't valid variables.

Babel Configuration


	"presets": [
	"plugins": [
		["@babel/proposal-decorators", { "legacy": true }],
		["@babel/proposal-class-properties", { "loose": true }],
		"./parameterDecorator.js" // plugin to add calls to parameter decorators:


  • Babel version: 7.4.3
  • Node/npm version: Node 11.10.0, npm 6.7.0
  • OS: Windows 10
  • How you are using Babel: WebPack

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commented Apr 9, 2019

Hey @jezzgoodwin! We really appreciate you taking the time to report an issue. The collaborators
on this project attempt to help as many people as possible, but we're a limited number of volunteers,
so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack
that typically always has someone willing to help. You can sign-up here
for an invite.

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