Cannot set property 'subscribable' of undefined

[thgh]

This happens when referencing a non existent store. The error does not contain any sign of where it is thrown which means it takes a lot of time to fix. One workaround is to open compiler.js:22884 and add if (!variable) console.log('subscribable', name, this.file).

Error is thrown here:

svelte/src/compile/Component.ts

Line 193 in 716e0df

variable.subscribable = true;

Stack trace

Cannot set property 'subscribable' of undefined

at Component.add_reference (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:22884:40) at Object.enter (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:21133:36) at visit (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:10204:10) at walk (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:10184:3) at new Expression (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:21094:10) at new EachBlock$1 (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:21547:28) at children.map.child (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:22695:23) at Array.map () at mapChildren (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:22693:22) at new Element$1 (/Users/thomas/projects/ga/node_modules/svelte/compiler.js:21974:26)

Repro: https://v3.svelte.technology/repl?version=3.0.0-beta.8&gist=b154d4f0c5e6d1cc3a03a70a1b7d2350

Same error 2:

<h1>Hello</h1>
<script>
  function test () {
    $name = 2
  }
</script>

Same error 3:

<h1>Hello</h1>
<script>
  $name = 2
</script>

[Conduitry]

I think ideally this shouldn't throw any error at all, but should instead create a subscription to a global variable, and it should emit a compiler warning that you're referring to an undefined variable.

[btakita]

A prompt fix on this would be appreciated. When upgrading a project with many components, this makes for a frustrating needle in a haystack.

[pngwn]

@btakita What version are you currently on and what version are you trying to upgrade to? This error was actually fixed at some point and as long as your code is valid (you aren't susbcribing to undeclared variables) shouldn't be happening.

If you are trying to subscribe to a global variable then that is more of an additional feature that is currently unsupported. The error message is not very friendly right now though.