Codefix: convert const to let

[jwbay]

TypeScript Version: 2.8.0-dev.20180308

Search Terms:
const let codefix

Code

const x = 42;

// lots of code

x/*1*/ = 75;

Expected behavior:
Error with codefix offered at 1 to convert the declaration from const to let

Actual behavior:
Just an error, no codefix

Related Issues:
The exact opposite of #13133

[MagWeaver]

Can I take this one?

[DanielRosenwasser]

Go for it!

[RubenMateus]

@MagWeaver any news from this?

[Fatehsandhu]

@DanielRosenwasser Can I please take over if it's possible?
Thanks

[mhegazy]

Go for it.

[Fatehsandhu]

@mhegazy Can I please get some help getting started? Which files should I be looking at?
Thanks

[mhegazy]

Quick fixes are attached to diagnostics. in this case TS Error 2540: Cannot assign to 'x' because it is a constant or a read-only property.

You can take a look at https://github.com/Microsoft/TypeScript/blob/master/src/services/codefixes/fixAwaitInSyncFunction.ts and https://github.com/Microsoft/TypeScript/blob/master/src/services/codefixes/fixSpelling.ts for a guide to how a quick fix can be implemented.

Also you will need to add handling for the readonly property case, where the readonly modifier would be removed.

[muradkhan101]

@Fatehsandhu Still working on this? If not I'd like to take a shot at it :)

[muradkhan101]

Hey @mhegazy, I have a potential fix for this here , but I couldn't find solid diagnostic messages to use and haven't figured out the readonly case yet though. Just wanted to check in with you to get some info about creating diagnostic messages and see if I'm on the right track here, thanks!

[suhailsinghbains]

Hi,
I'm new to open-source, can I please solve this issue?
Thanks

[muradkhan101]

@suhailsinghbains I'm currently working on this one and am close to completing so your time may be better spent on another one. I'll let you know if anything changes however.

[suhailsinghbains]

Sure @muradkhan101