tc39/ecma426

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Source map specification, RFCs and new proposals.

Stars: 186
Forks: 31
Open beginner issues: 0
Indexed issues: 73
Avg merge: 10d 23h
Merged PRs (30d): 2

Dominant language: JavaScript
License: No license data
Last GitHub push: Sep 11, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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73 open issues indexed

Underspecified sorting step for mappings Open

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

tc39/ecma426#273 · 1 comment · Opened Aug 15, 2026
Are item tags VLQs? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#268 · 2 comments · Opened Aug 6, 2026
Scopes: Scope encoding is hard for generators Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#265 · 7 comments · Opened Jun 19, 2026
Scopes: Should VendorExtensionItem be preserved by tools? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#264 · 1 comment · Opened Jun 17, 2026
Scopes: Bindings for nested scopes. Open

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

tc39/ecma426#263 · 1 comment · Opened Jun 7, 2026
Scopes: changes to allow more sparse access Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#262 · 11 comments · Opened Jun 6, 2026
Scopes: RangeFlags is a bit confusing Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

tc39/ecma426#261 · Opened Jun 5, 2026
Scopes: What is the correct position of generated ranges for call sites. Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#260 · 1 comment · Opened Jun 3, 2026
VLQ inefficiencies and opportunities Open

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

tc39/ecma426#259 · Opened Jun 3, 2026
Scopes: Should the GeneratedRangeCallSite Vlqs be relative? Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#258 · 9 comments · Opened May 28, 2026
Scopes: memory requirement for translating stack traces Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#256 · 6 comments · Opened May 23, 2026
Scopes: Encoding pseudo-tail-calls Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#255 · 7 comments · Opened May 21, 2026
Allow redundant trailing `;`s in the mappings to be omitted Open

question

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

tc39/ecma426#229 · 3 comments · Opened Sep 15, 2025
Resolving `sources` for inlined (data URI) sourcemaps Open

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

tc39/ecma426#213 · Opened Jun 25, 2025
Counting lines in JavaScript Open

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

tc39/ecma426#212 · 3 comments · 1 reaction · Opened Jun 22, 2025
Debug ID: Define for Index Source Map Open

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

tc39/ecma426#203 · 3 comments · 1 reaction · Opened Apr 18, 2025
Debug ID: Define how to extract `//# debugId=...` comment Open

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

tc39/ecma426#202 · 1 comment · Opened Apr 18, 2025
Debug ID: Considering splitting the proposal Open

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

tc39/ecma426#185 · 10 comments · 3 reactions · Opened Mar 17, 2025
Mappings decoding spec: What to do when "generatedColumn" is negative Open

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

tc39/ecma426#184 · Opened Mar 14, 2025
Spec bug: What happens with a `g,C` mapping? Open

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

tc39/ecma426#181 · 3 comments · Opened Mar 12, 2025
Meta: add data-noexport attribute to byte sequence definition Open

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

tc39/ecma426#174 · 11 comments · Opened Mar 6, 2025
Mappings v2: More Efficient Encoding Open

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

tc39/ecma426#155 · 1 comment · 1 reaction · Opened Nov 20, 2024
Extent of mapping segments Open

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

tc39/ecma426#139 · 1 reaction · Opened Oct 16, 2024
Avoid ambiguous "extract a source map comment" algorithms Open

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

tc39/ecma426#138 · 1 comment · Opened Oct 15, 2024
`sourceURL` in non-`eval` sources Open

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

tc39/ecma426#125 · 5 comments · Opened Sep 5, 2024
Scopes: When writing the spec text, add a section that we thought about security Open

Proposal: Scopes

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

tc39/ecma426#121 · Opened Aug 22, 2024
Scopes: support for hiding new injected scopes from the stack trace Open

Proposal: Scopes question

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#113 · 4 comments · Opened Jul 2, 2024
Scopes: what is `GeneratedRange.isScope`? Open

Proposal: Scopes

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

tc39/ecma426#112 · 1 comment · Opened Jun 25, 2024
Scopes: tweak function example and usage advice Open

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

tc39/ecma426#111 · Opened Jun 25, 2024
Does the HTTP source map header work for CSS files? Open

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

tc39/ecma426#108 · Opened Jun 25, 2024
My dream spec text Open

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

tc39/ecma426#105 · 6 reactions · Opened Jun 25, 2024
Consider reworking "background" section of spec Open

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

tc39/ecma426#103 · Opened Jun 25, 2024
Generated range of value replaced in the inlined function Open

Proposal: Scopes question

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#101 · Opened Jun 25, 2024
Make precise what is accepted as an index in, e.g., ignoreList Open

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

tc39/ecma426#95 · 1 reaction · Opened Jun 20, 2024
Specify validation for new features Open

discussion

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

tc39/ecma426#93 · Opened Jun 13, 2024
Source map security Open

discussion

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

tc39/ecma426#92 · 3 comments · Opened Jun 12, 2024
`sources`: clarify behavior of `null` case Open

Plenary: Consensus

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

tc39/ecma426#86 · 1 comment · Opened May 21, 2024
`sources`: clarify behavior on duplicate entries Open

clarification

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

tc39/ecma426#85 · 4 comments · 1 reaction · Opened May 21, 2024
Make index map specification more precise Open

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

tc39/ecma426#81 · Opened Apr 10, 2024
Make 32-bit limit on VLQs more precise Open

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

tc39/ecma426#80 · Opened Mar 28, 2024
Scopes: Inconsistent use of "relative" decoding Open

Proposal: Scopes

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

tc39/ecma426#77 · 1 comment · Opened Mar 10, 2024
Scopes: specify where to place the start and end locations Open

Proposal: Scopes

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

tc39/ecma426#76 · 2 comments · Opened Mar 8, 2024
Scopes: Should we require scopes/ranges to be properly nested (i.e. disallow straddling) Open

Proposal: Scopes

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#73 · 10 comments · Opened Mar 6, 2024
Scopes: Requiring root scopes and root range Open

Proposal: Scopes

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

tc39/ecma426#72 · 2 comments · Opened Mar 6, 2024
Scopes: how to encode unavailable bindings Open

Proposal: Scopes

Difficulty 5/5 Over a week Newbie friendliness 35/100

tc39/ecma426#70 · 4 comments · Opened Feb 27, 2024
Use JSON destination for fetching source maps Open

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

tc39/ecma426#63 · Opened Jan 18, 2024
Omit node_modules libs' sourcemaps from app sourcemaps without hurting debuggability? Open

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

tc39/ecma426#52 · 1 comment · Opened Sep 4, 2023
Define mappings that can be ignored when generating source map Open

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

tc39/ecma426#49 · 1 comment · Opened Aug 9, 2023
Add Meta Information about Generators into Source Map Open

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

tc39/ecma426#48 · 2 comments · 8 reactions · Opened Jun 29, 2023
List source map implementations Open

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

tc39/ecma426#47 · 13 comments · Opened Jun 13, 2023

tc39/ecma426

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