redux-form: CreateReducer.js uses "startsWith" which is unsupported in IE11

Are you submitting a bug report or a feature request?

bug report

What is the current behavior?

Unable to input text into Redux Form Field in IE11. Results in “TypeError: Object doesn’t support property or method ‘startsWith’”

What is the expected behavior?

It should be possible to input text without throwing any errors in IE11.

What’s your environment?

redux-form 7.4.2 IE11

Other information

Line causing the error: https://github.com/erikras/redux-form/blob/v7.4.2/src/createReducer.js#L47

  if (path.startsWith('values')) {

Commit that introduced the error: https://github.com/erikras/redux-form/commit/a97606fee0ed365903fff80cc93956fe2313a3ce

String.prototype.startsWith() browser support: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith

We’ve been able to work around this by using core-js to polyfill the feature.

About this issue

Original URL
State: closed
Created 6 years ago
Reactions: 5
Comments: 16 (1 by maintainers)

Most upvoted comments

This issue is marked as closed, but it persists because https://github.com/erikras/redux-form/pull/4128 has been merged into master, but not released yet. Any idea when this is going to be released? Thanks very much!

leocristofani on Oct 30, 2018

@erikras @gustavohenke any update on this?

rebebop on Aug 23, 2018

@erikras We need a release to fix this bug please

abumalick on Oct 23, 2018

import 'core-js/modules/es6.string.starts-with'; // redux-form in the beginning of your app

abumalick on Dec 3, 2018

Adding polyfills to Redux Form wouldn’t be a good idea, but if you mean using its implementation, then yeah, that’s an option.

An even better one would be to use a regular expression, like /^values/.test(path), as then others don’t need to guess where the magic number of the .substr() call is coming from.

gustavohenke on Jul 11, 2018