mozilla/source-map

View on GitHub

Consume and generate source maps.

Stars: 3.7k
Forks: 370
Open beginner issues: 0
Indexed issues: 42

Dominant language: JavaScript
License: No license data
Last GitHub push: Jul 21, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

Open All

42 open issues indexed

wasm-mappings fail to build with Rust 1.96+ Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mozilla/source-map#530 · Opened Jul 22, 2026
allow wasm to be bundled Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

mozilla/source-map#527 · Opened May 25, 2026
[RFH] smc.eachMapping is not a function Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/source-map#524 · 6 comments · Opened Apr 20, 2026
source map seems like not work, is there some hints from the perspective of source-map tool? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/source-map#516 · Opened Mar 28, 2025
Implement the proposal to add scopes and bindings information to source maps Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

mozilla/source-map#510 · 1 reaction · Opened Jun 3, 2024
Sources for /lib/mappings.wasm for software clearing Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/source-map#503 · 1 reaction · Opened Mar 11, 2024
Unable to parse webpack source URLs, how to work around around? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/source-map#500 · 3 comments · Opened Feb 20, 2024
Source maps mapping looks wrong when using Webpack Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#498 · 2 comments · Opened Nov 26, 2023
Add support for newly renamed `ignoreList` Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

mozilla/source-map#497 · 2 comments · 1 reaction · Opened Oct 24, 2023
Doesn't appear to work in an ESM browser environment Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

mozilla/source-map#496 · 10 comments · 2 reactions · Opened Aug 15, 2023
Add support for the x_google_ignoreList to the Sourcemap Generator Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla/source-map#492 · Opened Jun 29, 2023
lastColumn for originalPositionFor() Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#486 · 1 comment · Opened May 20, 2023
Add minimal CLI tool to recover original source Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#484 · 5 comments · 1 reaction · Opened Apr 26, 2023
`SourceNode.children` type incorrect Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

mozilla/source-map#482 · Opened Apr 3, 2023
Issue in consumer.originalPositionFor method is returning the lineNumber of next line of code in NextJs Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/source-map#479 · Opened Mar 18, 2023
Check if it's needed for `toStringWithSourceMap` to produce mapping for eol Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#478 · Opened Mar 13, 2023
Frequently hitting 'unreachable' errors with many source maps in memory Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

mozilla/source-map#476 · Opened Feb 9, 2023
`isBrowserEnvironment` is `false` in the browser Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla/source-map#459 · 6 comments · 13 reactions · Opened Aug 28, 2022
TypeError: Cannot read property 'indexOf' of null Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#450 · 1 comment · Opened Dec 14, 2021
Visual Studio cannot find Typescript declaration file 'source-map' Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla/source-map#449 · 3 comments · 3 reactions · Opened Dec 2, 2021
It seems that isProtoString will always return false? Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla/source-map#447 · Opened Oct 14, 2021
generator-only package Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

mozilla/source-map#446 · 12 comments · Opened Aug 23, 2021
`toStringWithSourceMap` behaves incorrectly if `SourceNode`s source is `null` or is an empty string Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#444 · 7 comments · Opened Aug 1, 2021
How line and column of `SourceNode` instance related to the contained chunk(s)? Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#442 · Opened Jun 26, 2021
Support for external url in sections ("index map") Open

feat spec

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/source-map#437 · Opened Apr 13, 2021
Feature .NET port of source-map Open

docs

Difficulty 5/5 Over a week Newbie friendliness 20/100

mozilla/source-map#433 · 2 comments · Opened Jan 6, 2021
Error creating a SourceMapGenerator from a SourceMapConsumer of an index map (part 2) Open

needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla/source-map#420 · Opened Sep 3, 2020
Create a bundle for browsers that includes the Wasm code? Open

feat

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/source-map#408 · 11 comments · 7 reactions · Opened Oct 9, 2019
Electron not supported Open

feat

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#390 · 4 comments · 1 reaction · Opened May 31, 2019
read-wasm abstraction Open

wasm

Difficulty 4/5 3-5 days Newbie friendliness 32/100

mozilla/source-map#372 · 2 comments · Opened Nov 23, 2018
Backport #308 to apply to 0.6 Open

needs-triage wasm

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/source-map#370 · 10 comments · 24 reactions · Opened Nov 5, 2018
util.join() doesn't handle absolute path on Windows correctly Open

feat

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

mozilla/source-map#355 · 1 comment · Opened Sep 4, 2018
TypeError when creating a SourceMapGenerator from a SourceMapConsumer of an index map Open

needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

mozilla/source-map#345 · 3 comments · Opened Jun 12, 2018
Memory leak (?) Open

needs-triage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/source-map#342 · 4 comments · 2 reactions · Opened May 29, 2018
Potential issue found by linting Open

needs-triage

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla/source-map#333 · 1 comment · 1 reaction · Opened May 4, 2018
Non-async source map. Open

feat

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/source-map#331 · 30 comments · 32 reactions · Opened Apr 24, 2018
originalPositionFor returns null if sourcemap does not contains the exact line. Open

needs-triage

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#261 · 6 comments · 3 reactions · Opened May 8, 2017
source-map omits some mappings when regenerating source map Open

feat

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/source-map#252 · 2 comments · Opened Nov 26, 2016
applySourceMap should be lossless Open

feat

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/source-map#216 · 7 comments · 2 reactions · Opened Oct 24, 2015
`originalPositionFor(generatedPosition)` fails on string positions Open

docs

Difficulty 1/5 Under an hour Newbie friendliness 45/100

mozilla/source-map#109 · 4 comments · 1 reaction · Opened May 5, 2014
Add check that URLs don't contain Windows path separators (`\`) Open

feat

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/source-map#91 · 6 comments · Opened Feb 10, 2014
Only generate a mapping at a generated location for the most specific mapping Open

feat spec

Difficulty 5/5 Over a week Newbie friendliness 25/100

mozilla/source-map#61 · 9 comments · Opened Apr 3, 2013

mozilla/source-map

Get new issues in your inbox