Failed to launch editor.

[youngvform]

What version of Next.js are you using?

10.0.5

What version of Node.js are you using?

12.16.2

What browser are you using?

Chrome

What operating system are you using?

macOS

How are you deploying your application?

local next dev

Describe the Bug

If an app crashes in development after set up REACT_EDITOR=code in .env.local, i will see an error overlay with clickable file name and stack trace.
When i click on it, it won't open an editor and throw an error like this

Failed to launch editor: TypeError: editor.toLowerCase is not a function
    at Object.launchEditor (/node_modules/@next/react-dev-overlay/lib/internal/helpers/launchEditor.js:310:16)
    at /node_modules/@next/react-dev-overlay/lib/middleware.js:320:61
    at step (/node_modules/@next/react-dev-overlay/lib/middleware.js:33:23)
    at Object.next (/node_modules/@next/react-dev-overlay/lib/middleware.js:14:53)
    at fulfilled (/node_modules/@next/react-dev-overlay/lib/middleware.js:5:58)

I think this line

next.js/packages/react-dev-overlay/src/internal/helpers/launchEditor.ts

Line 216 in 0bd1752

return shellQuote.parse(process.env.REACT_EDITOR)

return string array and toLowerCase is undefined in string array so throw error.

Expected Behavior

When i click an error overlay, it open an editor that i set up in env file.

To Reproduce

1. Set up REACT_EDITOR in .env.local file
2. Crash an app and click file name on error overlay

[balazsorban44]

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