Expand description

This library implements basic processing of JavaScript sourcemaps.


The crate is called sourcemap and you can depend on it via cargo:

sourcemap = "*"

If you want to use the git version:

git = "https://github.com/getsentry/rust-sourcemap.git"

Basic Operation

This crate can load JavaScript sourcemaps from JSON files. It uses serde for parsing of the JSON data. Due to the nature of sourcemaps the entirety of the file must be loaded into memory which can be quite memory intensive.


use sourcemap::SourceMap;
let input: &[_] = b"{
let sm = SourceMap::from_reader(input).unwrap();
let token = sm.lookup_token(0, 0).unwrap(); // line-number and column
println!("token: {}", token);


Functionality of the crate can be turned on and off by feature flags. This is the current list of feature flags:

  • ram_bundle: turns on RAM bundle support


Implements utilities for dealing with the sourcemap vlq encoding.


Iterates over all index items in a sourcemap
Iterates over all tokens in a sourcemap
Represents a raw token
Controls the SourceMap::rewrite behavior
Iterates over all source contents in a sourcemap
Iterates over all sources in a sourcemap
Represents a sourcemap in memory
Helper for sourcemap generation
Represents a react-native-style SourceMap, which has additional scope information embedded.
Represents a sourcemap index in memory
Represents a section in a sourcemap index
Iterates over all sections in a sourcemap index
Provides efficient access to minified sources.
Represents a token from a sourcemap
Iterates over all tokens in a sourcemap


Represents the result of a decode operation
Represents different failure cases
Represents a reference to a sourcemap


Decodes a sourcemap or sourcemap index from a reader
Loads a sourcemap from a data URL
Decodes a sourcemap or sourcemap index from a byte slice
Checks if a valid sourcemap can be read from the given reader
Checks if the given byte slice contains a sourcemap
Locates a sourcemap reference
Locates a sourcemap reference in a slice
Helper function to calculate the path from a base file to a target file.

Type Definitions

Represents results from this library