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docs(SvelteKit): fix Google Tag Manager example #570

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Mar 18, 2024
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docs(SvelteKit): fix Google Tag Manager example #570

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10 changes: 7 additions & 3 deletions docs/sveltekit.md
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Expand Up @@ -50,7 +50,11 @@ Adapting from [the HTML integration guide](https://partytown.builder.io/html)

## 3. Then add 3rd party scripts

This is where we use partytown to add those scripts (note `type="text/partytown"` below). This example shows Google Tag Manager. Putting it together with the previous changes, our `+layout.svelte` looks like:
This is where we use partytown to add those scripts (note `type="text/partytown"` below). If your script declares global functions or variables, make sure they are explicitly declared with `window` and forwarded to the web worker.

This example shows Google Tag Manager. Note `window.gtag = function()` instead of `function gtag()`.

Putting it together with the previous changes, our `+layout.svelte` looks like:

```svelte
// src/routes/+layout.svelte
Expand All @@ -65,7 +69,7 @@ This is where we use partytown to add those scripts (note `type="text/partytown"
<script>
// Forward the necessary functions to the web worker layer
partytown = {
forward: ['dataLayer.push']
forward: ['dataLayer.push', 'gtag']
};
</script>

Expand All @@ -74,7 +78,7 @@ This is where we use partytown to add those scripts (note `type="text/partytown"
<script type="text/partytown" src="https://www.googletagmanager.com/gtag/js?id=G-ZX7H2KPXNZ"></script>
<script type="text/partytown">
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
window.gtag = function(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-ZX7H2KPXNZ');
</script>
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