autocomplete workaround for string literal inside template literal stopped working since v5.3.3

🔎 Search Terms

string literal autocomplete template

🕗 Version & Regression Information

This changed between versions 5.3.2 and 5.3.3

⏯ Playground Link

https://www.typescriptlang.org/play?ts=5.3.3#code/C4TwDgpgBAYg9nKBeKByA9AMwaqAfNLBdALgEsATXAgAyLnQBIBvAZ2ACcyA7AcygBkUZgF8RNAFASAxnG7soAIwCGHEvEQpUqIA

💻 Code

type Foo = '/foo' | '/foo/:id' | `/foo/${string & {}}`

const bar:Foo = ''

🙁 Actual behavior

bar only gives /foo as a suggestion.

🙂 Expected behavior

bar gives /foo and /foo/:id as a suggestion.

Additional information about the issue

I understand that the autocomplete is a longer ongoing issue in combination with string literals. However there was a workaround described in (among other places): #29729

This workaround (string & {}) still works as long as it is not inside a template literal. But stopped working inside a template literal since v5.3.3.

This one works today:

type Foo = '/foo' | '/foo/:id' | (`/foo/${string}` & {})

const bar: Foo = ''

It likely has changed in #56434

Yes, that was the intended change for people to make:

Of course, that doesn't work before TS 5.3. See also #54188 (#56434 was in 5.4 which "finalized" the behavior).

Would accept a (very) non-invasive/non-impactful PR to allow both workarounds to work

My understanding from the design meeting discussions surrounding #56434 (#56450 ?) is that doing that was a problem as it involved traversing deeply into the elements (which I originally added but Anders removed?)

What's the right tag for "PRs accepted but you'll likely have to be more clever than the entire TS team to figure it out"...

cursed

The Cursed? tag doesn't get used often so it's always a hoot when I see it. I love that it exists.

type Foo = '/foo' | '/foo/:id' | (/foo/${string} & {})

const bar: Foo = ''

I can’t get this to work in any version of TS. Here’s the code in v5.7:

https://www.typescriptlang.org/play/?ts=5.7.3#code/C4TwDgpgBAYg9nKBeKByA9AMwaqAfNLBdALgEsATXAgCgAMi50ASAbwGdgAnMgOwHMAvnSgAyKK0EBKAFAyAxnF6coAIwCGXErATI0qIA

Not only does it not appear in the list for auto complete - empty string is also not assignable to type Foo.

It's not clear to me what your expected result is. Have you expected /foo/ to be suggested?

It's not clear to me what your expected result is

Sorry about that. I also just saw my expectation is a bit different from OPs, too.

In my case, I have a list of strings (known api urls) that I would like to see in auto complete:

type Foo = '/foo/' | `/bar/${string}/` | `/baz/${string}/` | string & {}

playground

Currently, only /foo/ shows up. Ideally, I would also get to see /bar and /baz somehow in the auto complete list

You are looking for this then: #59794

I am in the exact same situation like Dom, my case looks a bit more like this though:

type GlibGlob =  {
  [foo: `foo:${string}`]: string;
  [barBaz: `bar:baz:${string}`]: string;
  [barQux: `bar:qux:${string}`]: string;
}

I know that this is a lame way to express hierarchal data, but unfortunately I don't get a choice.
In this situation I get an autocomplete of... nothing, woe is me 😄

Closing language service bugs related to the 6.0 implementation. For more information, see #62827

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autocomplete workaround for string literal inside template literal stopped working since `v5.3.3` #57902

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autocomplete workaround for string literal inside template literal stopped working since v5.3.3 #57902

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🔎 Search Terms

🕗 Version & Regression Information

⏯ Playground Link

💻 Code

🙁 Actual behavior

🙂 Expected behavior

Additional information about the issue

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autocomplete workaround for string literal inside template literal stopped working since `v5.3.3` #57902