feat(cli): add a brazilian-utils command that runs any utility - #570
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Validating a CPF, generating a CNPJ for a fixture or looking a bank up from a shell script meant writing a throwaway Node script. The package now has a bin, so `npx @brazilian-utils/brazilian-utils isValidCpf 12345678909` works. The command is a generic dispatcher over src/index.ts, not a set of hand-written commands. The first argument names an export, positional values become its arguments and --key value, --flag, --no-flag and --json become its options or params object, so every utility added later is a command with no wiring. Values stay strings unless src/_cli/constants.ts gives them a kind (number, boolean, list, date). The type of those tables is derived from the public signatures, so a new non-string option that is not listed fails the type check. A value is read from stdin for "-" or when it is left out and stdin is a pipe or a file (not the socket a parent process opens, which would hang). Promises are awaited, which covers getAddressInfoByCep and getCepInfoByAddress. Objects print as JSON, dates as local calendar days, false and null exit with 1 and a usage error with 2. It costs library consumers nothing. No entry point imports it, it is built by a third pack config into dist/cli.js with the library left external, and every other file in dist/ is byte for byte what it was. The dispatcher is a pure function (run-cli) behind a process adapter (run-bin), both fully tested. Only the three-line Node.js entry is excluded from coverage, like src/index.ts.
Adds a Command line section to the README and to both getting-started pages (arguments, options, stdin, dates, output and exit codes), regenerates llms-full.txt and describes src/_cli and its kind tables in the Architecture section of CONTRIBUTING.
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Included review availability: Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughThe pull request adds a command-line interface with typed argument metadata, parsing, coercion, utility dispatch, output formatting, stdin support, executable packaging, tests, and usage documentation. ChangesCommand-line interface
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant User
participant bin.ts
participant runCli
participant Utility
User->>bin.ts: invoke command
bin.ts->>runCli: pass argv and stdin
runCli->>Utility: invoke validated utility
Utility-->>runCli: return result
runCli-->>bin.ts: return output and exit code
bin.ts-->>User: write stdout and stderr
Suggested reviewers: 🚥 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 bundle size impact. All 155 exports are the same size as on the base branch (full import 648.9 KB, gzip 166.2 KB). All exports (155)
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 @@
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This was referenced Sep 19, 2026
The `"./*"` wildcard in `exports` matched the new `dist/cli.js`, so `@brazilian-utils/brazilian-utils/cli` resolved and importing it ran the command inside the consumer's process: it wrote the usage to their stderr and set their `process.exitCode`. It also had no `cli.d.ts` and no `cli.cjs`, so the `types` and `require` conditions of the wildcard dangled for that path, and it made the package-wide `"sideEffects": false` untrue. Mapping `"./cli"` to `null` before the wildcard leaves the `bin` as the only way to reach the file. Every other subpath keeps resolving, and attw and publint stay clean.
Three answers the command line could give wrongly, plus the browser test run that could not carry the test as it was written. The implicit stdin rule asked whether positional values or `--json` were given, but not whether the utility takes its arguments as an object. Every such utility has `Function.length >= 1`, so `isHoliday --target-date 2026-09-07` read stdin and passed its text as the first argument, pushing the options to second place: inside a script run as `bash script.sh < input`, or in a `while read` loop, the command silently answered `false` instead of `true` (and consumed the loop's input). `CLI_PARAMS_UTILITIES` now lists those utilities, derived from the public signatures the same way `CLI_OPTION_KINDS` and `CLI_POSITIONAL_KINDS` are, so a new one that is missing fails `npm run check`, and they only read stdin where a `-` asks for it. A boolean option spelled `--symbol=no` kept the text, which is truthy, so it turned the flag on instead of off, and `--no-symbol=true` invented a `noSymbol` key and never set `symbol`. Both are usage errors now, exit 2, the way a missing value already was. A formatter that cannot read its value answers `""`, which exited 0 with a blank line and broke the `if brazilian-utils ...` idiom the docs advertise for the whole `format*` family. `""` is the library's third negative answer, next to `false` and `null`, so it exits 1 as well. The test of the dispatcher drove the public API through `src/index.ts`, which made it the second test file to instantiate the whole 278 module graph in one browser page. Chrome gave out on it: the run died on a dynamic import and a lost iframe, taking two unrelated files with it and cancelling edge and firefox. It now imports the utilities it exercises one by one, keeps the barrel as a type-only import for the type test, and `import/max-dependencies` is turned off for that file.
`formatCurrency 10 --no-symbol` illustrated `--flag`/`--no-flag` with a flag that changes nothing: `symbol` already defaults to `false`, so the example printed the same `10,00` either way. The row now shows `formatCurrency 10 --symbol` (`R$ 10,00`) and `isBusinessDay 2026-02-17 --no-include-optional` (`true` on Carnaval instead of `false`). The exit code paragraph gains the empty string a formatter answers with, and a new paragraph says that a utility whose first argument is an options object reads stdin only where a `-` asks for it. Deno needs no `-A`: the two CEP lookups are the only utilities that reach the network, so the sentence now states the plain `deno run npm:` form and says the runtime asks for what it needs.
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`toDate` started from `new Date(0)`, set the calendar day on it and then zeroed the time with `setHours(0, 0, 0, 0)`. In UTC that call does nothing at all, because the epoch is already local midnight there, so the Stryker job (which runs in UTC) reported the `setHours` to `setMinutes` mutant as survived: the whole statement is dead weight on that machine. It only looked alive here because this machine is UTC-3. The day now comes from the `Date` constructor, which already hands back local midnight with no time fields to clear, and `setFullYear` follows because the constructor reads a year below 100 as 19xx. Behaviour and the rollover check for a day that does not exist are unchanged; the file is back at a 100% mutation score in UTC and in UTC-3.
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In `@docs/getting-started.md`:
- Line 103: Update the CLI output description to match toCliOutput: document
JSON serialization for objects and arrays, and text serialization for dates and
JSON-incompatible values such as bigint and Symbol. Apply the equivalent
correction in docs/getting-started.md lines 103-103, docs/llms-full.txt lines
253-253, and docs/pt-br/getting-started.md lines 103-103, preserving each
document’s language.
In `@src/_cli/coerce-cli-value/coerce-cli-value.ts`:
- Around line 11-15: Update the date construction near the existing year/month
validation to avoid Date’s 1900 offset for years 0000–0099: store the day,
initialize a neutral Date, reset its time, and set year, month, and day via
setFullYear. Validate getFullYear(), getMonth(), and getDate() against the
parsed components before returning the date; otherwise return an invalid Date.
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CONTRIBUTING.mdREADME.mddocs/getting-started.mddocs/llms-full.txtdocs/pt-br/getting-started.mdknip.jsonpackage.jsonsrc/_cli/bin/bin.tssrc/_cli/coerce-cli-value/coerce-cli-value.test.tssrc/_cli/coerce-cli-value/coerce-cli-value.tssrc/_cli/constants.tssrc/_cli/parse-cli-arguments/parse-cli-arguments.test.tssrc/_cli/parse-cli-arguments/parse-cli-arguments.tssrc/_cli/run-bin/run-bin.test.tssrc/_cli/run-bin/run-bin.tssrc/_cli/run-cli/run-cli.test.tssrc/_cli/run-cli/run-cli.tssrc/_cli/to-cli-output/to-cli-output.test.tssrc/_cli/to-cli-output/to-cli-output.tsstryker.config.jsonvite.config.ts
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The `Date` constructor reads a year below 100 as 19xx, so `0000-02-29` was first built as 1900-02-29, which does not exist and rolled over to 1 March before `setFullYear` put the year back. The month check then rejected a day the proleptic Gregorian calendar has. The whole day is now set again with `setFullYear(year, month, day)`, and the month check still tells a day that does not exist apart (`0001-02-29` stays invalid).
The output sentence said that anything but a string or a number is printed as JSON, while `toCliOutput` prints a `Date` as its `YYYY-MM-DD` local day, alone or inside a JSON result (the `addBusinessDays` example just above shows it).
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hyanmandian
added this pull request to stack #578
September 19, 2026 19:30
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What
A zero-dependency command line shipped in the same package through a
binentry, sonpx @brazilian-utils/brazilian-utils <utility> ...works (andnpx brazilian-utils ...once the package is installed).It is a generic dispatcher over the public API, not a set of hand-written commands: the first argument names an export of
src/index.ts, so every utility added later is a command with no wiring.Command line contract
--key value,--key=value,--flag,--no-flagbuild the options (or params) object passed last (a boolean written--flag=valuetakes onlytrueorfalse, and--no-flagtakes no value: anything else is a usage error rather than a flag that looks unset and is on);--kebab-caseis read ascamelCase;--json '<object>'is the base object and explicit options win over it;--ends the options.001keeps its zeros) unlesssrc/_cli/constants.tsgives them a kind.CLI_OPTION_KINDS(by option key:version,precision,pad,accept,targetDate, ...),CLI_POSITIONAL_KINDS(by utility:addBusinessDays: ["date", "number"], ...) andCLI_PARAMS_UTILITIES(the utilities whose first argument is an options object) are the only per-utility knowledge the CLI has. Their types are derived from the exported signatures (typeof import("../index")), so adding a non-string option, a non-string positional argument or a params-only utility without listing it failsnpm run check. The one hand-listed entry isgetHolidays(itsyearoverload is hidden fromParameters<>by the params overload declared after it).YYYY-MM-DD, mean that local calendar day (how the date utilities read aDate) and are printed the same way, also inside JSON results (getHolidays), instead of the UTC instantJSON.stringifywould print.-is read from stdin; a value left out is read from stdin when stdin is a FIFO or a file, the utility takes a value as its first argument and--jsonwas not given. A utility whose first argument is an options object (isHoliday,getHolidays,isValidBankAccount, ...) is never fed stdin implicitly, soisHoliday --target-date 2026-09-07answers the same insidebash script.sh < input; that set is the third derived table,CLI_PARAMS_UTILITIES. A socket (whatchild_process.execgives a child) is deliberately not read either, soexec("brazilian-utils generateCpf")does not hang waiting for an stdin that never ends (covered in the transcript).0success,1for the three negative answers of the library (false,nulland the""a formatter or parser gives for input it cannot read) or a utility that throws/rejects (error name and message on stderr),2for a usage error (unknown utility, option without a value, bad boolean,--jsonthat is not an object).constructor,__proto__, error classes and inherited functions are rejected); option objects are built withObject.fromEntries/spread, so--__proto__ xand a__proto__key in--jsonare plain data.runClinever throws or rejects (fast-check properties over arbitrary argv, including against real utilities).--versionis only a built-in in first position, because--version 2is a real option (formatCnpj,isValidCnpj).Structure
src/_cli/follows the_internalsrules (one function per folder, tables inconstants.ts, underscore prefix sovite.config.tsdoes not turn it into a public subpath):src/_cli/run-cli/runCli({ argv, api, version, stdin }) => Promise<{ stdout, stderr, exitCode }>src/_cli/parse-cli-arguments/src/_cli/coerce-cli-value/src/_cli/to-cli-output/src/_cli/run-bin/processtorunClisrc/_cli/bin/bin.tsnode:process, thefstatstdin probe, thepackage.jsonversion, one call torunBinNothing is added to
src/index.ts,src/index.test.tsor the API report, so there is nothing to conflict with the sibling utility PRs.No effect on library consumers
src/_cli;sideEffectsandfilesare untouched.package.jsongains"bin": { "brazilian-utils": "./dist/cli.js" }and"./cli": nullinexports, before the"./*"wildcard: without it the wildcard would match the newdist/cli.jsand make@brazilian-utils/brazilian-utils/clian importable module that runs the command in the importer's process. Every other subpath resolves as before.vp packthrough a third pack config: one ESM file with the shebang (made executable by the build), no.d.ts, and its import ofsrc/index.tsrewritten to the external./brazilian-utils.jsby a small resolve plugin, sodist/cli.jsis 6.8 kB and the datasets are not shipped twice. Only the version string ofpackage.jsonis inlined, not the manifest.dist/withorigin/main'svite.config.tsand with this one and compared the SHA-256 of all 690 other files: identical.node scripts/tree-shaking.ts --compareagainst that baseline: "No bundle size impact. All 155 exports are the same size as on the base branch".reports/api/brazilian-utils.api.mdis unchanged (check:api:updatereports it up to date).JSR / Deno / Bun
bunx @brazilian-utils/brazilian-utils ...uses the samebin.bun dist/cli.jsis verified below, stdin included.deno run npm:@brazilian-utils/brazilian-utils ...runs an npm package'sbin.deno run dist/cli.jsis verified below, stdin included; it needs no permission flag (thefstatprobe on fd 0 asks for none), only--allow-netfor the two CEP utilities, which is what the docs now say instead of-A. I could not verify thenpm:specifier form itself before a release; the docs sentence claims nothing more than that Deno asks for the permissions it needs.binconcept, so the command stays an npm feature and Deno users reach it through thenpm:specifier.jsr.jsonin feat: Standard Schema wrapper, JSR, pkg.pr.new, docs previews and a playground #556 publishessrc/**/*.ts, which would pick upsrc/_cli/**, andsrc/_cli/bin/bin.tsimports../../../package.json, which is outside that include list. It is not reachable from any JSR export, so it should only be uploaded, not analysed, but"src/_cli/**"(and"src/_mcp/**"from the stacked feat(mcp): add a brazilian-utils-mcp server that exposes every utility to agents #571) must be added to itspublish.excludeonce feat: Standard Schema wrapper, JSR, pkg.pr.new, docs previews and a playground #556 is onmain. Not done here becausejsr.jsondoes not exist onmainyet.src/_clirun on Node, Bun and Deno through the runtime shim and use no Node API (the process is injected), so they are also safe for the browser runs.Review round
The independent review found, and this branch now fixes:
run-cli.test.tswas the second test file aftersrc/index.test.tsto import the whole barrel, so the full 278-module graph was instantiated twice in one browser page. It now imports the utilities it drives one by one and keeps the barrel as a type-only import for the type test;import/max-dependenciesis turned off for that one file.isHoliday --target-date 2026-09-07read stdin whenever stdin was a file or a pipe and passed its text as the first argument, shifting the options to second place. Fixed with the derivedCLI_PARAMS_UTILITIEStable, with literal tests."./*"wildcard exposeddist/cli.jsas@brazilian-utils/brazilian-utils/cli. Blocked with"./cli": null.--flag=<anything>kept the text, which is truthy, so--symbol=noturned the flag on;--no-symbol=trueinvented anoSymbolkey. Both are usage errors now.""and exited 0 with a blank line.""exits 1, likefalseandnull.--flag/--no-flagwith a no-op (formatCurrency 10 --no-symbol;symbolalready defaults tofalse). They now useformatCurrency 10 --symbolandisBusinessDay 2026-02-17 --no-include-optional.-A: only the two CEP lookups reach the network.The CI Stryker job then found one survivor of its own, which the per-file runs here could not see:
toDatestarted fromnew Date(0)and cleared the time withsetHours(0, 0, 0, 0), which does nothing in UTC (the epoch is local midnight there), so thesetHourstosetMinutesmutant was equivalent on the runner and alive on a UTC-3 machine. The day now comes straight from theDateconstructor, withsetFullYearafter it because the constructor reads a year below 100 as 19xx. The file scores 100% in both timezones.CodeRabbit round 1 (two threads, both fixed): the constructor still normalized a year below 100 as 19xx before
setFullYearran, so0000-02-29(a real proleptic Gregorian day) rolled over through 1900-02-29 and was rejected; the whole day is now set again withsetFullYear(year, month, day)(5ca538b, literal test, 100% mutation score in UTC and UTC-3). The docs now say a date is printed as itsYYYY-MM-DDlocal day, not as JSON (3bee6e7).Verification
npm run checknpm run test -- --runnpm run test:coveragenpm run build(publint + attw)npm run check:api:updatenpm run check:unused(knip)src/_cli/bin/bin.tsadded as an entry)npm run check:duplicationnpm run check:tree-shakingorigin/mainnpm run check:commitsnpm run test:mutationper file (run-cli,parse-cli-arguments,to-cli-output,coerce-cli-value), in UTC-3 and inTZ=UTCnpm run test:bunnpm run test:denonpm run build:llms,npm run build:sitellms-full.txtregenerated, site files unchangedMutation note: there is one
// Stryker disable BlockStatementinrun-bin.ts, around the four-line guard of the stdin probe. With an emptycatchthe probe answersundefined, whichrunClireads as "not piped" exactly likefalse, so that mutant is equivalent. The justification is in the comment, like the existing ones.End to end:
npm pack, thennpxfrom the tarball in an empty temp directoryTranscript
(The Deno lines above pass
--allow-read; I re-ran them with--no-promptand no permission flag and got the same output.)Open points
src/_cli/bin/bin.ts(shebang, imports, onerunBincall and the three-linefstatprobe) is excluded from coverage and from Stryker, likesrc/index.ts: importing it runs the command against the test runner's ownprocess. Everything it calls is covered at 100%, and the transcript above exercises it from the tarball.-explicitly. This is in--helpand in the docs.listprints every callable export, the deprecated upper-case aliases (formatCPF, ...) included: they are valid commands and the dispatcher cannot tell them apart generically. They go away with v3.npx @brazilian-utils/brazilian-utils <utility>relies on npm picking thebinnamed after the package (brazilian-utils, the unscoped name), which still holds once feat(mcp): add a brazilian-utils-mcp server that exposes every utility to agents #571 adds a secondbin,brazilian-utils-mcp: npm runs the singlebin, or else the one whose name matches the package name. From a tarball npx needs--package <tgz> brazilian-utils, which is what the transcript uses, so the registry form can only be confirmed after a release.--helpafter a utility prints the general usage, not the utility's own signature: the dispatcher has no per-utility descriptions, and the docs URL is printed instead.Summary by CodeRabbit
New Features
list,--help, and--versioncommands.YYYY-MM-DDdates and standardized success, failure, and usage exit codes.brazilian-utilsexecutable for package users.Documentation