Public record
Software health reportschema 0.30.0 · metrics 2.10.0 · 2026-08-04 17:35 UTC

mozilla / source-map

Consume and generate source maps.

JavaScript · RustCustom license★ 3,724 stars⑂ 369 forkssince Jul 2011View on GitHub ↗

mozilla/source-map holds a health index of 77 out of 100, placing it in the Good band. It scores highest on Community & Adoption (89/100) and lowest on AI Readiness (49/100). It was last updated 14 days ago. A single contributor accounts for most of its recent work.

77
overall / 100
Good

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

77
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 66 is calibrated to 77 on the published index scale (record calibration 2026-08-02).

Ownership

MozillaOrganization
10,681 followers2,562 public repossince Sep 2009

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publishTags
npmsource-map0.8.01,360,387,5667115 days ago
crates.iosource-map-mappingspoints to another repo — not scored0.5.02,78853080 days agovlqsourcesourcemapmapparser-implementations

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

54Moderate · 21% of overall
How it's scored
28.8/36Push recencylast push 14 days ago
4.2/36Commit cadence6/52 weeks with commits
8.6/18Commit volume8 commits in the last year
2/10OpenSSF Scorecard: Maintained3 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 2
Inputs used
commits_last_year8
human_commit_share1
days_since_last_push14
active_weeks_last_year6
How it's scored
27/27Ships releases2 releases published
7.2/36Release recencylatest release 376 days ago
27/27Release cadencea release every ~0 days
0/10OpenSSF Scorecard: Signed-Releasesno data
Inputs used
releases_count2
latest_release_tag0.7.6
releases_from_tagsno
days_since_latest_release376
mean_days_between_releases0
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

89Excellent · 17% of overall
How it's scored
57.9/60Stars3,724 stars
21.4/25Forks369 forks
10.2/15Watchers68 watchers
Inputs used
forks369
stars3,724
watchers68
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history
How it's scored
22.5/22.5README
16.9/22.5Licenselicense file present, not a recognized license
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges0
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_services
has_pull_request_templateno
How it's scored
80/80Monthly downloads1,360,387,566 downloads/month across npm
0/20Registry dependentsnot reported by this ecosystem
Inputs used
packagessource-map
dependents
ecosystemsnpm
total_downloads
monthly_downloads1,360,387,566
unverified_packages_excluded
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

77Good · 23% of overall
How it's scored
9/54Bus factor1 contributor(s) cover half of all commits
8.8/22.5Commit distributiontop contributor authored 61% of commits
13.5/13.5Contributor breadth81 contributors
10/10OpenSSF Scorecard: Contributorsproject has 43 contributing companies or organizations
Inputs used
bus_factor1
contributors_sampled81
top_contributor_share0.607
How it's scored
34.6/42Issue resolution82% of issues closed
23.1/30PR acceptance197/256 decided PRs merged
0/13Newcomer PR acceptanceno first-time contributor's PR decided in 30d
12/15OpenSSF Scorecard: Code-ReviewFound 12/15 approved changesets -- score normalized to 8
Inputs used
merged_prs197
open_issues42
closed_issues197
prs_merged_7d0
prs_decided_7d0
prs_merged_30d1
prs_decided_30d1
issue_closed_ratio0.824
closed_unmerged_prs59
first_time_authors_30d0
first_time_prs_merged_30d0
first_time_prs_decided_30d0
Excluded from scoring (no data or not applicable): Newcomer PR acceptance. Remaining weights renormalized.
How it's scored
30/30Ownership backingorganization-owned
0/20Verified domainverified-domain status not read for this organization
25/25Owner reach10,681 followers of mozilla
25/25Track record2,562 public repos, account ~16 yr old
Inputs used
followers10,681
owner_typeOrganization
is_verified
owner_loginmozilla
public_repos2,562
account_age_days6,156
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.

Package maintenance

100Exceptional
How it's scored
25/25Published & resolvable1 package(s) on npm
35/35Publish recencylatest publish 15 days ago
20/20Version history71 published versions
20/20Not deprecatedactive, not deprecated or yanked
Inputs used
packagessource-map
ecosystemsnpm
any_deprecatedno
min_days_since_publish15

Engineering Quality

Are baseline engineering and documentation practices in place?

60Moderate · 19% of overall
How it's scored
24/24CI workflows2 workflow(s)
24/24Tests present
16/16Linter config.eslintrc.js
0/9.6Pre-commit hooks
0/6.4.editorconfig
10/20OpenSSF Scorecard: CI-Tests6 out of 12 merged PRs checked by a CI test -- score normalized to 5
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configyes
has_precommit_configno
How it's scored
30/30README
0/25Documentation directory
0/15Documentation / homepage site
10/10Repository description
0/10Topics
0/10Wiki
Inputs used
topics
has_wikino
homepage
docs_site
has_readmeyes
has_docs_dirno
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

55Moderate · 16% of overall
How it's scored
6.8/7.5Binary-Artifactsbinaries present in source code
0/7.5Branch-Protectionno data
1.2/2.5CI-Tests6 out of 12 merged PRs checked by a CI test -- score normalized to 5
0/2.5CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
6/7.5Code-ReviewFound 12/15 approved changesets -- score normalized to 8
2.5/2.5Contributorsproject has 43 contributing companies or organizations
10/10Dangerous-Workflowno dangerous workflow patterns detected
0/7.5Dependency-Update-Toolno update tool detected
0/5Fuzzingproject is not fuzzed
2.2/2.5Licenselicense file detected
1.5/7.5Maintained3 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 2
0/5Packagingno data
2/5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 4
0/5SASTSAST tool is not run on all commits -- score normalized to 0
5/5Security-Policysecurity policy file detected
0/7.5Signed-Releasesno data
0/7.5Token-Permissionsdetected GitHub workflow tokens with excessive permissions
0/7.5Vulnerabilities18 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated15
scorecard_versionv5.5.0
checks_inconclusive3
scorecard_aggregate4.4
Excluded from scoring (no data or not applicable): Branch-Protection, Packaging, Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisoriesno direct dependency carries a known advisory
0/25Indirect dependencies free of known advisoriestransitive set not separable from development and test dependencies in this scope
0/40No advisories left outstandingno advisory carries a publication date
Inputs used
sourceosv
advisories18
affected_packages9
assessed_packages196
unassessed_packages6
affected_by_severitycritical 1, high 6, moderate 2
direct_affected_packages0
Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 196 resolved dependencies against OSV. 6 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list. This repository publishes no package the index resolves, so the repository dependency graph was assessed instead. That graph mixes development and test pins with shipped dependencies, so only the declared runtime dependencies are scored; transitive findings are reported as context and excluded from the score. Reachability is not analyzed.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

49Weak · 4% of overall
How it's scored
0/45Agent instructionsno CLAUDE.md / AGENTS.md / editor rules
0/15Machine-readable docs (llms.txt)
33.1/40Legible commit history62 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url
legible_history_share0.62
agent_instruction_files
agent_instruction_max_bytes
How it's scored
12.6/18One-command bootstrapwasm-mappings/Cargo.toml, wasm-mappings/source-map-mappings-wasm-api/Cargo.toml (toolchain convention, no task runner)
22/22Automated tests
11/11Lint / format config.eslintrc.js
0/11Static type checking
10/10Reproducible environmentlockfile
0/10Demonstrated agent practiceno agent-authored commits among the last 100
0/8Automated maintenanceno automated dependency updates observed
4/10OpenSSF Scorecard: Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 4
Inputs used
has_nixno
has_testsyes
lockfilespackage-lock.json
has_dockerfileno
typed_languageno
bootstrap_files
has_devcontainerno
has_linter_configyes
typecheck_configs
agent_commit_share0
toolchain_manifestswasm-mappings/Cargo.toml, wasm-mappings/source-map-mappings-wasm-api/Cargo.toml
dependency_bot_commit_share0
How it's scored
0/45Type-checkable codeJavaScript without a type-check config
51.3/55Manageable file sizes3/45 source files over 60KB
Inputs used
primary_languageJavaScript
largest_source_bytes15,927,873
source_files_sampled45
oversized_source_files3

Key facts

3,724GitHub stars
81contributors
8commits, last 12 months
14days since last push
2releases
1bus factor
42open issues
crates.io, npmpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • crates package 'source-map-mappings' points at a different repository (https://github.com/fitzgen/source-map-mappings); excluded from ecosystem scoring

More detail

Star and fork history 0 ★ / 369 ⇿
0Stars
369Forks
2Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

012525037534352011-102019-032026-07
Major 0Minor 0Patch 2

Each point covers 14 days.

OpenSSF Scorecard 4.4 / 10
4.4aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-08-04 17:35 UTC

9Binary-Artifactsbinaries present in source code
n/aBranch-Protectioninternal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md
5CI-Tests6 out of 12 merged PRs checked by a CI test -- score normalized to 5
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
8Code-ReviewFound 12/15 approved changesets -- score normalized to 8
10Contributorsproject has 43 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
0Dependency-Update-Toolno update tool detected
0Fuzzingproject is not fuzzed
9Licenselicense file detected
2Maintained3 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 2
n/aPackagingpackaging workflow not detected
4Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 4
0SASTSAST tool is not run on all commits -- score normalized to 0
10Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
0Token-Permissionsdetected GitHub workflow tokens with excessive permissions
0Vulnerabilities18 existing vulnerabilities detected
Direct dependencies 4
RegistryPackageVersion constraintManifest
npmwebpack^4.9.1bench/package.json
npmwebpack-cli^3.1bench/package.json
crates.iorand0.4.1wasm-mappings/Cargo.toml
crates.iovlq0.5.1wasm-mappings/Cargo.toml
All dependencies 202

Full resolved dependency set from the GitHub dependency graph: 4 direct and 198 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
crates.ioranddirect
crates.iovlqdirect
npmwebpack^4.9.1direct
npmwebpack-cli^3.1direct
crates.ioquickcheckindirect
crates.iosource-map-mappingsindirect
npm@bcoe/v8-coverage0.2.3indirect
npm@eslint/eslintrc1.3.3indirect
npm@humanwhocodes/config-array0.11.7indirect
npm@humanwhocodes/module-importer1.0.1indirect
npm@humanwhocodes/object-schema1.2.1indirect
npm@istanbuljs/schema0.1.3indirect
npm@jridgewell/resolve-uri3.1.0indirect
npm@jridgewell/sourcemap-codec1.4.14indirect
npm@jridgewell/trace-mapping0.3.17indirect
npm@nodelib/fs.scandir2.1.5indirect
npm@nodelib/fs.stat2.0.5indirect
npm@nodelib/fs.walk1.2.8indirect
npm@textlint/ast-node-types12.2.2indirect
npm@textlint/markdown-to-ast12.2.3indirect
npm@types/istanbul-lib-coverage2.0.4indirect
npm@types/mdast3.0.10indirect
npm@types/unist2.0.6indirect
npmacorn8.8.1indirect
npmacorn-jsx5.3.2indirect
npmajv6.12.6indirect
npmanchor-markdown-header0.6.0indirect
npmansi-regex5.0.1indirect
npmansi-styles4.3.0indirect
npmargparse2.0.1indirect
npmbail1.0.5indirect
npmbalanced-match1.0.2indirect
npmbrace-expansion1.1.11indirect
npmc87.12.0indirect
npmcallsites3.1.0indirect
npmccount1.1.0indirect
npmchalk4.1.2indirect
npmcharacter-entities1.2.4indirect
npmcharacter-entities-legacy1.1.4indirect
npmcharacter-reference-invalid1.1.4indirect
npmcliui7.0.4indirect
npmcolor-convert2.0.1indirect
npmcolor-name1.1.4indirect
npmconcat-map0.0.1indirect
npmconvert-source-map1.9.0indirect
npmcross-spawn7.0.3indirect
npmdebug4.3.4indirect
npmdeep-is0.1.4indirect
npmdoctoc2.2.1indirect
npmdoctrine3.0.0indirect
npmdom-serializer1.4.1indirect
npmdomelementtype2.3.0indirect
npmdomhandler4.3.1indirect
npmdomutils2.8.0indirect
npmemoji-regex10.1.0indirect
npmemoji-regex8.0.0indirect
npmentities2.2.0indirect
npmentities3.0.1indirect
npmescalade3.1.1indirect
npmescape-string-regexp4.0.0indirect
npmeslint8.27.0indirect
npmeslint-config-prettier8.5.0indirect
npmeslint-scope7.1.1indirect
npmeslint-utils3.0.0indirect
npmeslint-visitor-keys2.1.0indirect
npmeslint-visitor-keys3.3.0indirect
npmespree9.4.1indirect
npmesquery1.4.0indirect
npmesrecurse4.3.0indirect
npmestraverse5.3.0indirect
npmesutils2.0.3indirect
npmextend3.0.2indirect
npmfast-deep-equal3.1.3indirect
npmfast-json-stable-stringify2.1.0indirect
npmfast-levenshtein2.0.6indirect
npmfastq1.13.0indirect
npmfault1.0.4indirect
npmfile-entry-cache6.0.1indirect
npmfind-up5.0.0indirect
npmflat-cache3.0.4indirect
npmflatted3.2.7indirect
npmforeground-child2.0.0indirect
npmformat0.2.2indirect
npmfs.realpath1.0.0indirect
npmget-caller-file2.0.5indirect
npmglob7.2.3indirect
npmglob-parent6.0.2indirect
npmglobals13.17.0indirect
npmgrapheme-splitter1.0.4indirect
npmhas-flag4.0.0indirect
npmhtml-escaper2.0.2indirect
npmhtmlparser27.2.0indirect
npmignore5.2.0indirect
npmimport-fresh3.3.0indirect
npmimurmurhash0.1.4indirect
npminflight1.0.6indirect
npminherits2.0.4indirect
npmis-alphabetical1.0.4indirect
npmis-alphanumerical1.0.4indirect
npmis-buffer2.0.5indirect
npmis-decimal1.0.4indirect
npmis-extglob2.1.1indirect
npmis-fullwidth-code-point3.0.0indirect
npmis-glob4.0.3indirect
npmis-hexadecimal1.0.4indirect
npmis-path-inside3.0.3indirect
npmis-plain-obj2.1.0indirect
npmisexe2.0.0indirect
npmistanbul-lib-coverage3.2.0indirect
npmistanbul-lib-report3.0.0indirect
npmistanbul-reports3.1.5indirect
npmjs-sdsl4.1.5indirect
npmjs-yaml4.1.0indirect
npmjson-schema-traverse0.4.1indirect
npmjson-stable-stringify-without-jsonify1.0.1indirect
npmlevn0.4.1indirect
npmlocate-path6.0.0indirect
npmlodash.merge4.6.2indirect
npmlongest-streak2.0.4indirect
npmmake-dir3.1.0indirect
npmmarkdown-table2.0.0indirect
npmmdast-util-find-and-replace1.1.1indirect
npmmdast-util-footnote0.1.7indirect
npmmdast-util-from-markdown0.8.5indirect
npmmdast-util-frontmatter0.2.0indirect
npmmdast-util-gfm0.1.2indirect
npmmdast-util-gfm-autolink-literal0.1.3indirect
npmmdast-util-gfm-strikethrough0.2.3indirect
npmmdast-util-gfm-table0.1.6indirect
npmmdast-util-gfm-task-list-item0.1.6indirect
npmmdast-util-to-markdown0.6.5indirect
npmmdast-util-to-string2.0.0indirect
npmmicromark2.11.4indirect
npmmicromark-extension-footnote0.3.2indirect
npmmicromark-extension-frontmatter0.2.2indirect
npmmicromark-extension-gfm0.3.3indirect
npmmicromark-extension-gfm-autolink-literal0.5.7indirect
npmmicromark-extension-gfm-strikethrough0.6.5indirect
npmmicromark-extension-gfm-table0.4.3indirect
npmmicromark-extension-gfm-tagfilter0.3.0indirect
npmmicromark-extension-gfm-task-list-item0.3.3indirect
npmminimatch3.1.2indirect
npmminimist1.2.7indirect
npmms2.1.2indirect
npmnatural-compare1.4.0indirect
npmonce1.4.0indirect
npmoptionator0.9.1indirect
npmp-limit3.1.0indirect
npmp-locate5.0.0indirect
npmparent-module1.0.1indirect
npmparse-entities2.0.0indirect
npmpath-exists4.0.0indirect
npmpath-is-absolute1.0.1indirect
npmpath-key3.1.1indirect
npmprelude-ls1.2.1indirect
npmprettier2.7.1indirect
npmpunycode2.1.1indirect
npmqueue-microtask1.2.3indirect
npmregexpp3.2.0indirect
npmremark-footnotes3.0.0indirect
npmremark-frontmatter3.0.0indirect
npmremark-gfm1.0.0indirect
npmremark-parse9.0.0indirect
npmrepeat-string1.6.1indirect
npmrequire-directory2.1.1indirect
npmresolve-from4.0.0indirect
npmreusify1.0.4indirect
npmrimraf3.0.2indirect
npmrun-parallel1.2.0indirect
npmsemver6.3.0indirect
npmshebang-command2.0.0indirect
npmshebang-regex3.0.0indirect
npmsignal-exit3.0.7indirect
npmstring-width4.2.3indirect
npmstrip-ansi6.0.1indirect
npmstrip-json-comments3.1.1indirect
npmsupports-color7.2.0indirect
npmtest-exclude6.0.0indirect
npmtext-table0.2.0indirect
npmtraverse0.6.7indirect
npmtrough1.0.5indirect
npmtype-check0.4.0indirect
npmtype-fest0.20.2indirect
npmunderscore1.13.6indirect
npmunified9.2.2indirect
npmunist-util-is4.1.0indirect
npmunist-util-stringify-position2.0.3indirect
npmunist-util-visit-parents3.1.1indirect
npmupdate-section0.3.3indirect
npmuri-js4.4.1indirect
npmv8-to-istanbul9.0.1indirect
npmvfile4.2.1indirect
npmvfile-message2.0.4indirect
npmwhich2.0.2indirect
npmword-wrap1.2.3indirect
npmwrap-ansi7.0.0indirect
npmwrappy1.0.2indirect
npmy18n5.0.8indirect
npmyargs16.2.0indirect
npmyargs-parser20.2.9indirect
npmyocto-queue0.1.0indirect
npmzwitch1.0.5indirect
Dependency advisories 9

This repository publishes no package the index resolves, so its own dependency graph was assessed — 196 packages, which also include development and test pins that never ship: 9 carry known advisories, of which 0 are direct. 6 could not be assessed — no resolved version, an unsupported ecosystem, or beyond the reported package list.

PackageVersionRelationSeverityAdvisoriesFixed in
flatted3.2.7indirectcritical23.4.2
brace-expansion1.1.11indirecthigh55.0.9
cross-spawn7.0.3indirecthigh17.0.5
js-yaml4.1.0indirecthigh34.3.0
minimatch3.1.2indirecthigh310.2.3
semver6.3.0indirecthigh17.5.2
underscore1.13.6indirecthigh11.13.8
ajv6.12.6indirectmoderate18.18.0
word-wrap1.2.3indirectmoderate11.2.4

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.30.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statisticsnpm, crates.io.