Public recordModerate
Software health reportschema 0.26.0 · metrics 1.13.0 · 2026-07-22 16:37 UTC
guybedford / es-module-lexer
Low-overhead lexer dedicated to ES module parsing for fast analysis
guybedford/es-module-lexer holds a health index of 63 out of 100, placing it in the Moderate band. It scores highest on Vitality (70/100) and lowest on AI Readiness (30/100). It was last updated 9 days ago. A single contributor accounts for most of its recent work.
63
overall / 100Software health index
Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At risk ceiling of 49. AI Readiness sits outside the overall score.
63
Excellent85-100Exemplary; meets essentially all checked criteria
Good70-84Healthy; minor gaps
Moderate50-69Acceptable with notable gaps; review recommended
At risk30-49Significant weaknesses; adoption warrants caution
Critical1-29Severe problems (abandoned, single-maintainer, no hygiene)
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.
Ownership
Guy BedfordPersonal account
1,954 followers376 public repossince Feb 2011Cloudflare
This repository is owned by a personal account. A single-owner project carries more continuity risk than an organization-backed one.
Package ecosystems
| Registry | Package | Version | Downloads / mo | Versions | Last publish |
|---|---|---|---|---|---|
| npm | es-module-lexer | 2.3.1 | 479,313,413 | 75 | 10 days ago |
Metrics by category
Vitality
Is the project alive — is code being written and are releases shipping?
70
Development activity
55Moderate
How it's scored
| 28.8/36 | Push recency — last push 9 days ago |
| 4.2/36 | Commit cadence — 6/52 weeks with commits |
| 12.4/18 | Commit volume — 23 commits in the last year |
| 10/10 | OpenSSF Scorecard: Maintained — 19 commit(s) and 3 issue activity found in the last 90 days -- score normalized to 10 |
Inputs used
| commits_last_year | 23 |
| human_commit_share | 1 |
| days_since_last_push | 9 |
| active_weeks_last_year | 6 |
Release discipline
92Excellent
How it's scored
| 27/27 | Ships releases — 33 releases published |
| 36/36 | Release recency — latest release 10 days ago |
| 19.8/27 | Release cadence — a release every ~89.5 days |
| 0/10 | OpenSSF Scorecard: Signed-Releases — no data |
Inputs used
| releases_count | 33 |
| latest_release_tag | 2.3.1 |
| releases_from_tags | no |
| days_since_latest_release | 10 |
| mean_days_between_releases | 89.5 |
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?
69
Popularity & adoption
67Moderate
How it's scored
| 48.9/60 | Stars — 1,030 stars |
| 14.6/25 | Forks — 57 forks |
| 3.9/15 | Watchers — 6 watchers |
Inputs used
| forks | 57 |
| stars | 1,030 |
| watchers | 6 |
| growth_state | unverified |
| growth_factor_pct | 100 |
| growth_unverified_reason | no_history |
Community health
50Moderate
How it's scored
| 22.5/22.5 | README |
| 22.5/22.5 | License — recognized license (MIT) |
| 0/18 | CONTRIBUTING guide |
| 0/13.5 | Code of conduct |
| 0/7.2 | Issue template |
| 0/6.3 | PR template |
Inputs used
| has_readme | yes |
| has_license | yes |
| has_contributing | no |
| has_issue_template | no |
| has_code_of_conduct | no |
| has_pull_request_template | no |
Ecosystem adoption (downloads)
100Excellent
How it's scored
| 80/80 | Monthly downloads — 479,313,413 downloads/month across npm |
| 0/20 | Registry dependents — not reported by this ecosystem |
Inputs used
| packages | es-module-lexer |
| dependents | — |
| ecosystems | npm |
| total_downloads | — |
| monthly_downloads | 479,313,413 |
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?
70
Maintainer resilience (bus factor)
36At risk
How it's scored
| 9/54 | Bus factor — 1 contributor(s) cover half of all commits |
| 4/22.5 | Commit distribution — top contributor authored 82% of commits |
| 13.5/13.5 | Contributor breadth — 26 contributors |
| 10/10 | OpenSSF Scorecard: Contributors — project has 12 contributing companies or organizations |
Inputs used
| bus_factor | 1 |
| contributors_sampled | 26 |
| top_contributor_share | 0.822 |
How it's scored
| 43.4/46.8 | Issue resolution — 93% of issues closed |
| 33.8/38.3 | PR acceptance — 106/120 decided PRs merged |
| 6/15 | OpenSSF Scorecard: Code-Review — Found 13/30 approved changesets -- score normalized to 4 |
Inputs used
| merged_prs | 106 |
| open_issues | 7 |
| closed_issues | 90 |
| issue_closed_ratio | 0.928 |
| closed_unmerged_prs | 14 |
Ownership & stewardship
73Good
How it's scored
| 10/30 | Ownership backing — personal (user) account |
| 0/20 | Verified domain — not applicable to user accounts |
| 23.7/25 | Owner reach — 1,954 followers of guybedford |
| 25/25 | Track record — 376 public repos, account ~15 yr old |
Inputs used
| followers | 1,954 |
| owner_type | User |
| is_verified | — |
| owner_login | guybedford |
| public_repos | 376 |
| account_age_days | 5,648 |
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.
Package maintenance
100Excellent
How it's scored
| 25/25 | Published & resolvable — 1 package(s) on npm |
| 35/35 | Publish recency — latest publish 10 days ago |
| 20/20 | Version history — 75 published versions |
| 20/20 | Not deprecated — active, not deprecated or yanked |
Inputs used
| packages | es-module-lexer |
| ecosystems | npm |
| any_deprecated | no |
| min_days_since_publish | 10 |
Engineering Quality
Are baseline engineering and documentation practices in place?
53
Engineering practices
62Moderate
How it's scored
| 24/24 | CI workflows — 1 workflow(s) |
| 24/24 | Tests present |
| 0/16 | Linter config |
| 0/9.6 | Pre-commit hooks |
| 0/6.4 | .editorconfig |
| 14/20 | OpenSSF Scorecard: CI-Tests — 17 out of 23 merged PRs checked by a CI test -- score normalized to 7 |
Inputs used
| has_ci | yes |
| has_tests | yes |
| has_editorconfig | no |
| has_linter_config | no |
| has_precommit_config | no |
Documentation
40At risk
How it's scored
| 30/30 | README |
| 0/25 | Documentation directory |
| 0/15 | Documentation / homepage site |
| 10/10 | Repository description |
| 0/10 | Topics |
| 0/10 | Wiki |
Inputs used
| topics | — |
| has_wiki | no |
| homepage | — |
| has_readme | yes |
| has_docs_dir | no |
| has_description | yes |
Security
Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?
50
Security posture
50Moderate
How it's scored
| 7.5/7.5 | Binary-Artifacts — no binaries found in the repo |
| 0/7.5 | Branch-Protection — no data |
| 1.8/2.5 | CI-Tests — 17 out of 23 merged PRs checked by a CI test -- score normalized to 7 |
| 0/2.5 | CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected |
| 3/7.5 | Code-Review — Found 13/30 approved changesets -- score normalized to 4 |
| 2.5/2.5 | Contributors — project has 12 contributing companies or organizations |
| 10/10 | Dangerous-Workflow — no dangerous workflow patterns detected |
| 0/7.5 | Dependency-Update-Tool — no update tool detected |
| 0/5 | Fuzzing — project is not fuzzed |
| 2.5/2.5 | License — license file detected |
| 7.5/7.5 | Maintained — 19 commit(s) and 3 issue activity found in the last 90 days -- score normalized to 10 |
| 0/5 | Packaging — no data |
| 0/5 | Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
| 0/5 | SAST — SAST tool is not run on all commits -- score normalized to 0 |
| 0/5 | Security-Policy — security policy file not detected |
| 0/7.5 | Signed-Releases — no data |
| 0/7.5 | Token-Permissions — detected GitHub workflow tokens with excessive permissions |
| 7.5/7.5 | Vulnerabilities — 0 existing vulnerabilities detected |
Inputs used
| source | openssf_scorecard |
| checks_evaluated | 15 |
| scorecard_version | v5.5.0 |
| checks_inconclusive | 3 |
| scorecard_aggregate | 5 |
Excluded from scoring (no data or not applicable): branch_protection, packaging, signed_releases. Remaining weights renormalized.
AI Readiness
How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score.
30
Agent context & guidance
34At risk
How it's scored
| 0/45 | Agent instructions — no CLAUDE.md / AGENTS.md / editor rules |
| 0/15 | Machine-readable docs (llms.txt) |
| 33.6/40 | Legible commit history — 63 of 100 human commits state their intent (structured subject or explanatory body) |
Inputs used
| has_llms_txt | no |
| legible_history_share | 0.63 |
| agent_instruction_files | — |
| agent_instruction_max_bytes | — |
Verify loop (build / test / typecheck)
22Critical
How it's scored
| 0/18 | One-command bootstrap |
| 22/22 | Automated tests |
| 0/11 | Lint / format config |
| 0/11 | Static type checking |
| 0/10 | Reproducible environment |
| 0/10 | Demonstrated agent practice — no agent-authored commits among the last 100 |
| 0/8 | Automated maintenance — no automated dependency updates observed |
| 0/10 | OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
Inputs used
| has_nix | no |
| has_tests | yes |
| lockfiles | — |
| has_dockerfile | no |
| typed_language | no |
| bootstrap_files | — |
| has_devcontainer | no |
| has_linter_config | no |
| typecheck_configs | — |
| agent_commit_share | 0 |
| toolchain_manifests | — |
| dependency_bot_commit_share | 0 |
Code legibility for models
31At risk
How it's scored
| 0/45 | Type-checkable code — JavaScript without a type-check config |
| 30.9/55 | Manageable file sizes — 7/16 source files over 60KB |
Inputs used
| primary_language | JavaScript |
| largest_source_bytes | 902,016 |
| source_files_sampled | 16 |
| oversized_source_files | 7 |
Machine-readable interfaces
40At risk
How it's scored
| 0/40 | API schema (OpenAPI/GraphQL/proto) |
| 0/20 | MCP server |
| 40/40 | Runnable examples — samples |
Inputs used
| example_dirs | samples |
| has_mcp_signal | no |
| api_schema_files | — |
Key facts
1,030GitHub stars
26contributors
23commits, last 12 months
9days since last push
33releases
1bus factor
7open issues
npmpackage ecosystems
Data collection warnings
- Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
- deps.dev does not index npm:es-module-lexer@2.3.1; advisories assessed against the repository dependency graph instead
- No resolved dependencies carried a version and a supported ecosystem
More detail
Star and fork history 0 ★ / 57 ⇿
0Stars
57Forks
33Releases
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.
Major 2Minor 11Patch 20
Each point covers 7 days.
OpenSSF Scorecard 5.0 / 10
5.0aggregate
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).
| 10 | Binary-Artifacts | no binaries found in the repo |
| n/a | Branch-Protection | internal 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 |
| 7 | CI-Tests | 17 out of 23 merged PRs checked by a CI test -- score normalized to 7 |
| 0 | CII-Best-Practices | no effort to earn an OpenSSF best practices badge detected |
| 4 | Code-Review | Found 13/30 approved changesets -- score normalized to 4 |
| 10 | Contributors | project has 12 contributing companies or organizations |
| 10 | Dangerous-Workflow | no dangerous workflow patterns detected |
| 0 | Dependency-Update-Tool | no update tool detected |
| 0 | Fuzzing | project is not fuzzed |
| 10 | License | license file detected |
| 10 | Maintained | 19 commit(s) and 3 issue activity found in the last 90 days -- score normalized to 10 |
| n/a | Packaging | packaging workflow not detected |
| 0 | Pinned-Dependencies | dependency not pinned by hash detected -- score normalized to 0 |
| 0 | SAST | SAST tool is not run on all commits -- score normalized to 0 |
| 0 | Security-Policy | security policy file not detected |
| n/a | Signed-Releases | no releases found |
| 0 | Token-Permissions | detected GitHub workflow tokens with excessive permissions |
| 10 | Vulnerabilities | 0 existing vulnerabilities detected |
All dependencies 10
Full resolved dependency set from the GitHub dependency graph: 0 direct and 10 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.
| Registry | Package | Version | Relation |
|---|---|---|---|
| npm | @babel/cli | ^7.29.7 | indirect |
| npm | @babel/core | ^7.29.7 | indirect |
| npm | @babel/plugin-transform-modules-commonjs | ^7.29.7 | indirect |
| npm | @swc/cli | ^0.8.1 | indirect |
| npm | @swc/core | ^1.15.41 | indirect |
| npm | @types/node | ^25.9.3 | indirect |
| npm | kleur | ^4.1.5 | indirect |
| npm | mocha | ^11.7.6 | indirect |
| npm | terser | ^5.48.0 | indirect |
| npm | typescript | ^6.0.3 | indirect |
Dependency advisories not assessed
Advisory matching could not run for this report: No resolved dependencies carried a version and a supported ecosystem
Raw JSON report machine-readable
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{
"oid": "2abc49eafca47730b5ec395c0f7c1b2e136312c5",
"body": "* perf(lexer): skip identifier and number runs\n\nOn the 3,057 KiB sample corpus, Wasm drops from 15,356.31 to 13,010.46 us per sweep on Node 18.20.8 (-15.28%) and from 11,724.34 to 9,856.69 us on Node 24.18.0 (-15.93%). The asm.js build drops from 15,934.34 to 12,945.57 us on Node 24.18.0 (-18.76%).\n\nThe fast path adds 379 raw / 105 gzip bytes to the full Wasm binary. Measurements used 1,500 warmup sweeps followed by 9 interleaved trials of 50 sweeps, dropping the best and worst trials.",
"is_bot": false,
"headline": "perf(lexer): skip identifier and number runs (#227)",
"author_name": "Ruben Bridgewater",
"author_login": "BridgeAR",
"committed_at": "2026-07-13T01:00:31Z",
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"oid": "8c21b74b1f06dd739a000467a489bf71927f63ce",
"body": "* perf(lexer): gate keywordStart on the next byte for i/c tokens\n\nThe main character loop calls keywordStart() (and through it a second\nboundary helper) on every `i` and `c` it reaches, but over real-world\nsources the next byte rules the token out ~98% of the time for `i` and\n~95% for `c`. Checking \n[…]\nyte, so the\nmemcmp only needs \"ass\". Slice &LASS[1] (LASS stays for the two\nnon-fast-path class checks). -4 bytes, no extra instructions.\n\n---------\n\nCo-authored-by: Guy Bedford <guybedford@gmail.com>",
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"headline": "perf(lexer): gate keywordStart on the next byte for i/c tokens (#223)",
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"headline": "perf: fast native UTF-16 source copy into Wasm memory on Node (#224)",
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"headline": "2.3.0",
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{
"oid": "f3c972d9ded43c6b1f3503305fda7eb067ad7989",
"body": "…e readme (#219)\n\nThe minimal wasm build added in #211 predates the #217 memory growth fix\nand was missing -s ALLOW_MEMORY_GROWTH=1, so parse() on sources over ~4M\nchars threw \"Maximum memory size exceeded\" (the Large source test from\n#217 catches this under test:minimal:wasm).\n\nAlso documents the es-module-lexer/minimal build in the readme, and\ncorrects the stale comments claiming dynamic-import n / ip() are dropped\nin the minimal build: _ip is exported and read, only at/ss/f/ms go.",
"is_bot": false,
"headline": "fix: allow wasm memory growth in the minimal build, document it in th…",
"author_name": "Guy Bedford",
"author_login": "guybedford",
"committed_at": "2026-07-02T01:10:17Z",
"body_truncated": false,
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{
"oid": "e9b611ea3ab4ae16c0be3cb77a611a0d92347a39",
"body": "The emsdk toolchain update in #203 dropped the growable memory the old\nfastcomp build emitted: the wasm memory was declared with\nmaximum == initial (258 pages / ~16MiB), so the unconditional\nmemory.grow() in parse() throws \"Maximum memory size exceeded\" for any\nsource over ~4M chars (stored as 4 bytes per char).\n\nAdd -s ALLOW_MEMORY_GROWTH=1 to restore growable memory, and a 5MB\nlarge source regression test.\n\nFixes #214",
"is_bot": false,
"headline": "fix: allow wasm memory growth for sources over ~4MB (#217)",
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"body": "… (#211)\n\nAdds a LEXER_MIN build variant that drops the metadata es-module-shims\nnever reads, exposed as two new package entry points alongside the\nexisting full builds:\n\n- es-module-lexer/minimal -> dist/lexer.minimal.js (wasm)\n- es-module-lexer/minimal/js -> dist/lexer.minimal.asm.js (asm\n[…]\n to build/*.mjs; the full build is unchanged\n(byte-for-byte). The test suite runs against both variants (MINIMAL=1)\nwith min-only-field assertions gated; bench and footprint cover the full\n2x2 matrix.",
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"headline": "feat: add minimal build for es-module-shims (es-module-lexer/minimal)…",
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"body": "* docs: correct stale limitations and gzip size in README\n\nTwo README claims no longer match the shipped library:\n\n1. The Limitations section says `export var a = 'asdf', q = z` only detects\n `a` and `export var { a: b } = asdf` misses `b`. Both are detected\n correctly in current releases. Repla\n[…]\nure is about half the current size. All three\n published builds (lexer.js, lexer.cjs, lexer.asm.js) gzip to ~8 KiB.\n\n* Update README.md\n\n---------\n\nCo-authored-by: Guy Bedford <guybedford@gmail.com>",
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"headline": "docs: correct stale limitations and gzip size in README (#212)",
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"body": "Exports exposed only the exported and local name ranges, so a consumer could\nnot locate the `export` keyword introducing a binding. Each export specifier\nnow carries `ss`, the statement start, matching the import `ss`. Only the\nstatement start is tracked, not its end.\n\nFixes: https://github.com/guybedford/es-module-lexer/issues/112",
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"headline": "feat: expose export statement start position as ss (#206)",
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"body": "* fix: report n for no-substitution template dynamic imports\n\nA dynamic import whose specifier is a no-substitution template literal\n(import(`./x.js`)) returned n: undefined, while the quoted forms returned the\nspecifier. A template with no ${...} is a constant string, so it now records a\nsafe speci\n[…]\nbstitution template threw a parse error on the asm.js build while\nWASM and the JS fallback decoded it. Apply the same backtick exception.\n\n---------\n\nCo-authored-by: Guy Bedford <guybedford@gmail.com>",
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"headline": "fix: report n for no-substitution template dynamic imports (#201)",
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"body": "* build(deps-dev): update dev dependencies to latest\n\nThe TypeScript and mocha majors each break a build step unless paired with a\nchange here:\n\n1. `build:types` errored on `Buffer` — TypeScript 6 no longer auto-includes\n @types/node for a file passed on the tsc command line, so the call now\n pa\n[…]\ndropped the bdd `beforeEach`, so its two hooks use the\n tdd `setup` alias.\n\n* fix(bench): update kleur to v4 function-call chaining API\n\n---------\n\nCo-authored-by: Guy Bedford <guybedford@gmail.com>",
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"body": "Disambiguate `of` as identifier vs for-of contextual keyword inside\n`for (...)` by checking whether `of` actually follows a binding (the\nonly place the for-of keyword can appear). In valid JS a binding always\nends with an identifier-tail char, ']', '}', or ')' — anything else\nmeans `of` is just an i\n[…]\nwhich only excluded ';' and\n'=', missing '+', '-', '*', ',', '<', '|', '&', '?', etc.) and also\nhandles tab/newline whitespace and the no-space-before-of cases like\n`for ([x]of /regex/)`.\n\nFixes #188.",
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{
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"headline": "feat: support import defer syntax (#187)",
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"headline": "feat: implement `initSync` (#185)",
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"headline": "Update README.md for types info (#182)",
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"headline": "fix: add exports type for lexer.asm.js (#179)",
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"headline": "fix regex case of (#171)",
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"headline": "Source phase imports (#168)",
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"headline": "fix: handle regexp as default export (#167)",
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"headline": "fix: ignore dynamic import for has ESM syntax (#164)",
"author_name": "翠 / green",
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{
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"body": "* feat: skip trailing white space in dynamic import\r\n\r\n* test: add more test cases",
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"headline": "feat: skip trailing white space in dynamic import (#162)",
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"headline": "fix: dynamic import paren ranges (#157)",
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"components": [
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{
"key": "pr_acceptance",
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{
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},
{
"key": "stewardship",
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{
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{
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{
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{
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],
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{
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"metrics": [
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{
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}
],
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},
"warnings": [
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"deps.dev does not index npm:es-module-lexer@2.3.1; advisories assessed against the repository dependency graph instead",
"No resolved dependencies carried a version and a supported ecosystem"
],
"report_type": "repository",
"generated_at": "2026-07-22T16:37:28.558983Z",
"schema_version": "0.26.0",
"badge_url": "https://raw.githubusercontent.com/inspect-software/badges/main/v1/g/guybedford/es-module-lexer.svg",
"full_name": "guybedford/es-module-lexer",
"license_state": "standard",
"license_spdx": "MIT"
}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 v1.13.0, schema v0.26.0 — full methodology · metrics wiki.
How one result sits in the wider record: aggregate statistics — npm.