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docs(js-browser): adding predefined matches for ignoring common spans #15116

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docs(js-browser): adding predefined matches for ignoring common spans #15116

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docs(js-browser): adding predefined matches for ignoring common spans
nikolovlazar Oct 2, 2025
9641a8f
docs(js-browser): escaping dots in ignoreSpans examples
nikolovlazar Oct 2, 2025
5190b96
Merge branch 'master' into lazar-ignore-spans-examples
nikolovlazar Oct 2, 2025
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Apply suggestion from @sfanahata
nikolovlazar Oct 7, 2025
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25 changes: 25 additions & 0 deletions docs/platforms/javascript/common/configuration/options.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -449,6 +449,31 @@ If a root span matches any of the specified patterns, the entire local trace wil

By default, no spans are ignored.

Here are some predefined matches for common spans to get you started:
```javascript
Sentry.init({
ignoreSpans: [
// Browser connection events
{op: /^browser\.(cache|connect|DNS)$/},

// Fonts
{op: 'resource.other', name: /.+\.(woff2|woff|ttf|eot)$/},

// CSS files
{op: 'resource.link', name: /.+\.css.*$/},

// JS files
{op: /resource\.(link|script)/, name: /.+\.js.*$/},

// Images
{op: /resource\.(other|img)/, name: /.+\.(png|svg|jpe?g|gif|bmp|tiff?|webp|avif|heic?|ico).*$/},
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Bug: Regex Patterns Incorrectly Match File Extensions

The ignoreSpans examples for CSS, JS, and image files use regex patterns that are too broad. The .*$ at the end allows them to incorrectly match filenames containing the extension string but not ending with it (e.g., file.css.map, script.js.backup). This could lead to unintended spans being ignored.

Fix in Cursor Fix in Web

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The .* at the end is to match the cache fingerprint segment, but yes coincidentally it's going to match .css.map and .js.backup. Either way, if we ignore the .css files we'll most likely want to ignore the rest, so we should be good.


// Measure spans
{op: 'measure'},
]
});
```

</SdkOption>

<SdkOption name="propagateTraceparent" type='boolean' defaultValue='false' availableSince='10.10.0' categorySupported={['browser']}>
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2 changes: 1 addition & 1 deletion docs/platforms/javascript/common/configuration/tree-shaking.mdx
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@@ -1,6 +1,6 @@
---
title: Tree Shaking
sidebar_order: 11000
sidebar_order: 70
description: "Learn how to reduce Sentry bundle size by tree shaking unused code."
notSupported:
- javascript.aws-lambda
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