Supported source map features | sourcemaps-lookup | Spatie

 SPATIE

sourcemaps-lookup
=================

spatie.be/open-source

  [Docs](https://spatie.be/docs)  [Sourcemaps-lookup](https://spatie.be/docs/sourcemaps-lookup/v1)  Advanced-usage  Supported source map features

 Version   v1

 Other versions for crawler [v1](https://spatie.be/docs/sourcemaps-lookup/v1)

  Supported source map features
- [ Introduction ](https://spatie.be/docs/sourcemaps-lookup/v1/introduction)
- [ Support us ](https://spatie.be/docs/sourcemaps-lookup/v1/support-us)
- [ Requirements ](https://spatie.be/docs/sourcemaps-lookup/v1/requirements)
- [ Installation & setup ](https://spatie.be/docs/sourcemaps-lookup/v1/installation-setup)
- [ Benchmarks ](https://spatie.be/docs/sourcemaps-lookup/v1/benchmarks)
- [ Questions and issues ](https://spatie.be/docs/sourcemaps-lookup/v1/questions-issues)
- [ About us ](https://spatie.be/docs/sourcemaps-lookup/v1/about-us)
- [ Changelog ](https://spatie.be/docs/sourcemaps-lookup/v1/changelog)

Basic usage
-----------

- [ Looking up a position ](https://spatie.be/docs/sourcemaps-lookup/v1/basic-usage/looking-up-a-position)
- [ Reading inlined source content ](https://spatie.be/docs/sourcemaps-lookup/v1/basic-usage/reading-source-content)
- [ Error handling ](https://spatie.be/docs/sourcemaps-lookup/v1/basic-usage/error-handling)
- [ Complete example ](https://spatie.be/docs/sourcemaps-lookup/v1/basic-usage/complete-example)

Advanced usage
--------------

- [ Reverse lookup ](https://spatie.be/docs/sourcemaps-lookup/v1/advanced-usage/reverse-lookup)
- [ Resolving the enclosing scope ](https://spatie.be/docs/sourcemaps-lookup/v1/advanced-usage/resolving-the-enclosing-scope)
- [ Marking third-party sources ](https://spatie.be/docs/sourcemaps-lookup/v1/advanced-usage/marking-third-party-sources)
- [ Listing the source files ](https://spatie.be/docs/sourcemaps-lookup/v1/advanced-usage/listing-source-files)
- [ Tips for bulk lookups ](https://spatie.be/docs/sourcemaps-lookup/v1/advanced-usage/tips-for-bulk-lookups)
- [ Supported source map features ](https://spatie.be/docs/sourcemaps-lookup/v1/advanced-usage/supported-features)
- [ Under the hood ](https://spatie.be/docs/sourcemaps-lookup/v1/advanced-usage/under-the-hood)

 Supported source map features
=============================

###  On this page

1. [ Supported ](#content-supported)
2. [ Not supported (by design) ](#content-not-supported-by-design)

Supported
-----------------------------------------------------------------------------------

- Source Map v3 "regular" maps (the default format produced by bundlers).
- 1-field (unmapped), 4-field (mapped), and 5-field (mapped with name) segments.
- `sourceRoot` prefixing.
- `null` entries in the `sources` array (returned as `sourceFileName === null`).
- Inlined `sourcesContent`.
- `ignoreList` for third-party sources (exposed via `isIgnored()`).
- Enclosing scope resolution via `scopeAt()`. Heuristic polyfill today, natively backed by the [ECMA-426 Scopes proposal](https://github.com/tc39/source-map/blob/main/proposals/scopes.md) when bundlers begin emitting it.

Not supported (by design)
-------------------------------------------------------------------------------------------------------------------------------

- Writing, generating, merging, or transforming source maps.
- Indexed and sectioned source maps (throws `UnsupportedSourceMap`. File an issue if you need this).
- Source Map v4 or legacy v2.
- External source fetching. Only inlined `sourcesContent` is read.

 A good
match?
-------------

### What we do best

- All things Laravel
- Custom frontend components
- Building APIs
- AI-powered features
- Simplifying things
- Clean solutions
- Integrating services

### Not our cup of tea

- WordPress themes
- Cutting corners
- Free mockups to win a job
- "Just execute the briefing"

 In short: we'd like to be a **substantial part** of your project.

 [ Get in touch via email ](mailto:info@spatie.be?subject=A%20good%20match%21&body=Tell%20us%20as%20much%20as%20you%20can%20about%0A-%20your%20online%20project%0A-%20your%20planning%0A-%20your%20budget%0A-%20%E2%80%A6%0A%0AAnything%20that%20helps%20us%20to%20start%20straightforward%21)