feat: add obfuscate to formatPhone, formatPis, formatCnh and formatVoterId, plus obfuscateEmail and obfuscatePixKey - #567
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe change adds obfuscation options to phone, CNH, PIS, and voter-ID formatters. It adds ChangesObfuscation support
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~30 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Caller
participant obfuscatePixKey
participant getPixKeyInfo
participant Formatter
Caller->>obfuscatePixKey: provide Pix key
obfuscatePixKey->>getPixKeyInfo: classify and validate key
getPixKeyInfo-->>obfuscatePixKey: return key type
obfuscatePixKey->>Formatter: apply type-specific masking
Formatter-->>Caller: return obfuscated value
Suggested reviewers: Merge Risk: ⚪ Minimal · up to This change adds opt-in obfuscation for identifiers, phone numbers, email, and Pix keys while preserving existing default behavior. No actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
📝 Generate docstrings
🧪 Generate unit tests (beta)
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Tree-shaking report✅ No size regression. 4 grew, 2 new out of 170 exports.
What changed (6)
All exports (170)
How this is measuredEvery export is imported alone into an esbuild consumer bundle (minified, tree-shaken) built from the head and from the base of this pull request; the sizes are the resulting bundles, gzip is their gzipped size. 🔴 marks a regression: a pre-existing export that grew more than 20% and more than 256 B, or the bundle importing every pre-existing export growing more than 5%. 🟡 is growth under the threshold, 🟢 a decrease, ⚪ no change, 🆕 an export that does not exist on the base (never a regression), 🗑️ an export that was removed. An intentional increase is accepted with the |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## claude/business-day-saturdays #567 +/- ##
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Coverage 100.00% 100.00%
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Files 199 201 +2
Lines 2161 2186 +25
Branches 642 655 +13
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+ Hits 2161 2186 +25
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Inline comments:
In `@docs/llms.txt`:
- Line 169: Complete the truncated descriptions for obfuscatePixKey and the
corresponding utility entry so both sentences are grammatically complete and
accurately describe their behavior. If these lines are generated, update the
generator’s description handling to preserve text following the “art.”
abbreviation and regenerate the index.
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📒 Files selected for processing (24)
docs/llms-full.txtdocs/llms.txtdocs/pt-br/utilities.mddocs/utilities.mdreports/api/brazilian-utils.api.mdsrc/format-cnh/constants.tssrc/format-cnh/format-cnh.test.tssrc/format-cnh/format-cnh.tssrc/format-phone/constants.tssrc/format-phone/format-phone.test.tssrc/format-phone/format-phone.tssrc/format-pis/constants.tssrc/format-pis/format-pis.test.tssrc/format-pis/format-pis.tssrc/format-voter-id/constants.tssrc/format-voter-id/format-voter-id.test.tssrc/format-voter-id/format-voter-id.tssrc/index.test.tssrc/index.tssrc/obfuscate-email/constants.tssrc/obfuscate-email/obfuscate-email.test.tssrc/obfuscate-email/obfuscate-email.tssrc/obfuscate-pix-key/obfuscate-pix-key.test.tssrc/obfuscate-pix-key/obfuscate-pix-key.ts
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This was referenced Sep 22, 2026
A phone number is personal data under the LGPD, and formatCpf/formatCnpj were the
only formatters able to print a value someone should recognize but not read. The
option hides the subscriber number under every mask and keeps the last 2 digits,
the count the gov.br account shows for the registered mobile ("*********00"). The
prefix that names a region or a service instead of a subscriber stays too: the
DDD, the 0800-like code and the 300X/400X root.
A 3 digit public utility code identifies no one and is returned as it is, and a
value the "service" mask does not recognize is hidden entirely, since it used to
be returned raw. The option defaults to false and is read for truthiness, like
formatCpf does, so the current output does not change.
…matVoterId
No authority publishes a masking rule for the PIS, the CNH or the voter id, so the
option applies the one Lei 12.309/2010, art. 87, par. 5, sets for the CPF ("ocultar
os tres primeiros digitos e os dois digitos verificadores") to the three numbers
that share its structure, a base number followed by check digits: the first 3
digits and the check digits are hidden, and the federative union code of a voter
id stays visible.
formatVoterId gains its first options argument, FormatVoterIdOptions. Every option
defaults to false and is read for truthiness, so the current output does not
change. formatCns and formatPassport are left out: neither has a published
convention, and neither has the base plus check digits layout the CPF rule
transfers to.
An e-mail address has no formatter to hang an obfuscate option on, so it gets a utility of its own. It follows the way the gov.br account shows the registered address, "li***********@gm*******": the first 2 characters of the local part and of the domain stay, the @ stays and every other character becomes one asterisk, so the length is preserved. The gov.br sample does not cover a local part of 1 or 2 characters, which that rule would show whole, so such a local part always loses its last character. An invalid address returns an empty string, the way the formatters do.
A list of registered Pix keys shows CPFs, phone numbers and e-mail addresses, all personal data. The utility identifies the key with getPixKeyInfo and hands each kind to the utility that already hides it: formatCpf and formatCnpj with obfuscate, formatPhone with the international mask and obfuscate, and obfuscateEmail. The CPF form is the one the Banco Central prints for a "CPF mascarado" in the Pix user experience manual. A random key is returned whole: the DICT manual defines it as a sequence with no meaning other than being a Pix key, so it carries no personal data to hide. A value that is not a Pix key returns an empty string.
Each entry says which characters stay visible and where the choice comes from: the gov.br account screens for phones and e-mail addresses, Lei 12.309/2010 for the numbers that share the structure of a CPF, and the Banco Central manuals for Pix keys. English and Portuguese, plus the regenerated llms files.
formatE164 resolved the obfuscated pattern on every call and then threw it away on the plain path, which reads as if the plain path used it. Return the plain form first so the pattern is only built when it is going to be used. No behaviour change: the plain branch already ignored the pattern.
The formatPhone JSDoc and the utilities pages promised "only the last 2
digits" under every mask, but the default "sn" mask truncates a DDD-prefixed
value first, so the visible pair is the 8th and 9th digit of the value, not
its last two. Say so where the promise is made, next to the truncation
warning the plain examples already carry, and pin it with a test.
The same paragraph said a value the "service" mask does not recognize is
"hidden entirely". Every digit is replaced by a "*", so the digits are hidden
but the digit count is not, and that tells a reader whether the value was a
mobile, a landline or a fragment. Describe it as it is.
obfuscateEmail keeps the first 2 characters of each side whatever they are,
so a first domain label of a single character leaves its dot visible
("maria@a.bc" becomes "ma***@A.**"). The text claimed the dots of the domain
were always hidden. Reword it and rename the test that already asserted it.
The llms.txt index takes the first sentence of each docs paragraph and already protects "e.g." and "i.e." from being read as a sentence end. A Brazilian law article is cited the same way, so the formatCertidao entry stopped at "the printed mask of art." and shipped an unfinished sentence in the public index. Protect "art." too.
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What
LGPD-friendly masking beyond CPF/CNPJ. The opt-in
obfuscateoption thatformatCpfandformatCnpjalready have now exists onformatPhone,formatPis,formatCnhandformatVoterId, and two new utilities cover the identifiers that have no formatter:obfuscateEmailandobfuscatePixKey.Every option defaults to
falseand is read for truthiness the wayformatCpfreads it, so no current output changes. No export was renamed or removed;formatVoterIdgains an optional second argument.API
Which characters stay, and why
0800-like code,300X/400Xroot, plus+55) and the last 2 digits the mask has room for*********00: last 2 digits only. The count comes from there. gov.br hides the DDD as well; it is kept here because the task asked for the area code, and it names a region, not a subscriber.@, first 2 of the domain, whatever those characters are; one*per hidden character, the remaining dots includedli***********@gm*******(gmail.comis 9 characters:gmplus 7 asterisks).Details worth a look in review:
formatPhonepatterns are literal tables next to the plain ones (MASKS/OBFUSCATED_MASKSinsrc/format-phone/constants.ts), read by the same code path, so there is one algorithm and two tables."service"mask returns a value it does not recognize as it came. Underobfuscatethat would leak a whole number, so every digit of such a value becomes a*(***********), except a valid 3 digit public utility code (190), which identifies no one. The digits are hidden, the digit count is not, which is the same trade the length-preserving masks make everywhere else here."sn"a DDD-prefixed value is truncated before it is masked, exactly as it is withoutobfuscate, soformatPhone('11987654321', { obfuscate: true })shows the 8th and 9th digit, not the last two of the value. Pass{ mask: 'auto' }or{ mask: 'nanp' }when the value carries a DDD, as the plain masks already require."e164"withobfuscatedrops what is past the 11th national digit, while the plain"e164"output keeps printing it. Only invalid input is affected.obfuscateEmaildeviates from the gov.br sample in one case the sample does not cover: a local part of 1 or 2 characters would be shown whole, so it always loses its last character (a*@...,*@...).obfuscateEmailkeeps the first 2 characters of each side whatever they are, so a first domain label of a single character leaves its dot visible:obfuscateEmail('maria@a.bc')isma***@a.**.obfuscateEmailjudges the value withisValidEmailas it comes (no trimming, case kept).obfuscatePixKeyworks over the canonical DICT form fromgetPixKeyInfo, so an e-mail key is trimmed and lowercased first.obfuscatePixKeyprints a phone key with the"international"mask, display oriented like the CPF and CNPJ keys, instead of the bare E.164 form.Naming
I kept
obfuscateEmail/obfuscatePixKeyas proposed. The alternative that matches the library better on paper isformatEmail/formatPixKeywith anobfuscateoption, but aformatEmailhas nothing to do when the option is off, and aformatPixKeyis a feature of its own (which mask per kind of key) that this PR should not smuggle in. IfformatPixKeyever lands,obfuscatePixKeybecomes a thin call to it.Sources
***.456.789-**convention, quoted above. Read from the Planalto page.li***********@gm*******and*********00. I counted the asterisks on the enlarged images (_images/enviar_codigo_email_recuperar_senha_novogov_atualizado_novaversao.png,_images/enviar_codigo_sms_recuperar_senha_novogov_atualizado_novaversao.png).obfuscatePixKeyis not for the payment confirmation screen.Verification
npm run check: passnpm run test -- --run: 186 files, 6174 passednpm run test:coverage: 100% statements, branches, functions and linesnpm run test:bunandnpm run test:deno: passnpm run build: pass (attw and publint clean)npm run check:api:update: report committed;npm run check:apiclean afterwardsnpm run check:unused: passnpm run check:duplication: 0 clonesnpm run check:tree-shaking, andnode scripts/tree-shaking.ts --compareagainst a build oforigin/main: no regression.formatPhone+549 B (+19.0%, the threshold is 20% and 256 B),formatVoterId+123 B,formatPis+42 B,formatCnh+40 B; new:obfuscatePixKey6.7 KB (it pulls the CPF, CNPJ, phone and e-mail validators throughgetPixKeyInfo),obfuscateEmail1.2 KB.npm run check:commits: 0 problemsnpm run test:mutation -- --mutateover the six touched or new source files: 165 mutants, 165 killed, 100%Open points
formatCnsandformatPassportare left out. I found no published masking convention for the CNS (web searches over DATASUS/RNDS and LGPD guides for the public sector turned up nothing) and know of none for the passport, which I did not research beyond that, and neither has the base plus check digits layout that lets the CPF rule transfer: a provisional CNS has no separable check digit and the leading digits of a CNS carry little entropy, and a passport number has no check digit at all. Picking digits for them would be a guess, so they wait for a source or a maintainer decision.NIS FAVORECIDOwithout describing any masking, so it was no help either way.src/format-phone/constants.tsonly.formatPhonesits at +19.0%, just under the 20% tree-shaking threshold, because the obfuscated patterns are literal tables. They could be derived from the plain patterns at run time to save part of that, at the cost of the patterns no longer being readable in one place; I kept the tables.Signed-off-byline, following the recent history ofmain, although CONTRIBUTING asks for one.Summary by CodeRabbit
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