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597 hallazgos en 8 ecosistemas.
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- gem
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Lo que dice la muestra y mide su contrato
501–525 de 568, medidos por muestras publicadas.
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npmContrato de muestranode · linux/x64@babel/core@8.0.1
Se creeTargeting an environment with known JavaScript engine bugs forces preset-env to downlevel the surrounding modern ES2015+ syntax categories down to ES5 helper functions.
Medidopreset-env targeting Safari 14 preserves native ES2015 destructuring syntax and parameter defaults while surgically renaming only the colliding parameter identifier to avoid JavaScriptCore scope shadowing bugs
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npmContrato de muestranode · linux/x64@babel/preset-env@7.29.7
Se creeLeaving useBuiltIns unset in @babel/preset-env automatically injects polyfills for unsupported ECMAScript standard library methods across configured target environments when corejs is configured or core-js is imported.
MedidoWhen useBuiltIns is unset, @babel/preset-env defaults to false and leaves standard library methods un-polyfilled without injecting any core-js imports, even when targets lack support or corejs is specified.
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npmContrato de muestranode · linux/x64@babel/preset-env@8.0.2
Se creeIn Babel presets, legacy configuration options like loose, spec, bugfixes, and useBuiltIns remain accepted as valid options, and isPluginRequired continues to be exported as a helper function.
MedidoPassing loose, spec, bugfixes, or useBuiltIns to @babel/preset-env in major version 8 throws descriptive removal errors rather than accepting legacy configuration options or polyfill strategies.
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composerContrato de muestraphp · linux/x64symfony/console@8.1.4
Se creeSubclassing Command with a static getDefaultName method automatically defines the command name on instantiation, and closures assigned via setCode may omit explicit integer return values.
MedidoCommand subclasses defining static getDefaultName() have a null name in Symfony Console 8 because getDefaultName() was removed in favor of #[AsCommand], and Application::addCommand() throws LogicException for empty names.
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npmContrato de muestranode · linux/x64@rollup/plugin-commonjs@29.0.3
Se creeWhen bundling CommonJS modules that conditionally require Node built-ins into ESM, @rollup/plugin-commonjs preserves lazy evaluation inside functions without hoisting static imports to the module top level.
MedidoBy default, @rollup/plugin-commonjs hoists conditional require('node:fs') calls to top-level ESM static imports, eagerly loading built-in modules on startup rather than preserving lazy CommonJS evaluation.
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npmContrato de muestranode · linux/x64@rollup/plugin-commonjs@28.0.9
Se creeBy default @rollup/plugin-commonjs transforms require expressions into bundled module imports in any file processed by Rollup.
Medidoassert requireReturnsDefault defaults to false, returning an augmented namespace object with __esModule marker rather than unwrapping default export directly when CJS requires ESM
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creeA good model expects CSV to inherit its default `row_sep` from `$INPUT_RECORD_SEPARATOR` whenever `row_sep` is not passed.
Medidoassert that setting `$INPUT_RECORD_SEPARATOR` to "|" and calling `CSV.new("a,b")` yields `row_sep == "\n"`
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creeThe CSV :numeric and :integer converters parse numeric string values using base-10 decimal representation.
MedidoCSV.parse_line with converters: :numeric parses leading-zero strings like 012 as octal integer 10, whereas strings with non-octal digits like 008 fall through to float 8.0 rather than parsing as decimal integers or strings
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creeCSV.parse treats an input IO stream as caller-managed and leaves it open after parsing, while CSV.open and CSV.foreach automatically release underlying file handles.
MedidoCSV.parse(io) without a block permanently closes the caller-provided IO or StringIO stream upon completion, whereas CSV.parse(io) with a block leaves the stream open
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creeCalling CSV.instance twice with the same source should create independent parser state that starts from the beginning each time.
MedidoCSV.instance caches one parser per source object and option set, so the second call with the same source reuses the first parser's cursor instead of starting over.
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creePassing converters: :numeric parses numeric strings with leading zeros as decimal numbers or preserves them consistently as strings.
MedidoCSV.parse_line with converters: :numeric parses leading-zero strings with octal digits 0-7 as octal integers while strings containing 8 or 9 fall back to floats, mutating 0123 into 83 and 0890 into 890.0 across a round trip
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creeCSV::InvalidEncodingError inherits from Ruby core's EncodingError, and liberal_parsing: true suppresses unclosed quote errors.
MedidoCSV::InvalidEncodingError inherits from CSV::MalformedCSVError and RuntimeError rather than EncodingError, so rescue EncodingError fails to catch byte sequence errors during parsing.
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creeCSV.parse returns empty strings for unquoted empty fields between delimiters by default.
Medidoassert parsing unquoted empty fields returns nil rather than empty string when nil_value is left unset
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gemContrato de muestraruby · linux/x64csv@3.3.2
Se creeA developer expects duplicated header values to follow normal Ruby Hash last-wins semantics when using CSV row conversion.
MedidoCSV.parse("id,id,name\n1,2,alice\n", headers: true).first.to_h["id"] evaluates to "1", not "2", because CSV::Row#to_h preserves the first duplicate header.
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cargoContrato de muestrarust · linux/x64winnow@1.0.4
Se creeCalling `Parser::default_value()` makes a parser yield the default value whenever the wrapped parser fails.
Medidoassert `alpha1.default_value()` on '123' returns `Err(ErrMode::Backtrack(_))` instead of falling back to `0`
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npmContrato de muestranode · linux/x64@babel/core@8.0.1
Se creeloadPartialConfig({...}) returns a PartialConfig object synchronously, because that is how every Babel 7 example, README snippet, and tool integration calls it; the callback form was always optional.
MedidoCalling loadPartialConfig() without a callback in Babel 8 throws an Error whose message names loadPartialConfigSync as the required synchronous replacement — in Babel 7 the identical call returned a PartialConfig object without throwing.
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hexContrato de muestraelixir · linux/x64nimble_csv@1.3.0
Se creeWhen a parser is defined with separator: ["|", ";"], dumping rows that were parsed from semicolon-delimited input will preserve the semicolon separator, because the parser accepted that format.
MedidoParsing semicolon-separated CSV with a multi-separator parser succeeds, but dump_to_iodata emits pipe-separated output — the first separator in the list — not the semicolon the input used, because the dump separator is fixed at compile time by the first list entry.
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hexContrato de muestraelixir · linux/x64nimble_pool@1.1.0
Se creeA model expects that starting a lazy pool with lazy: true defers worker module validation until checkout, allowing start_link to return {:ok, pid} even when given an unresolvable worker module or an atom :infinity for pool_size.
MedidoNimblePool.start_link/1 with lazy: true eagerly ensures the worker module is loaded in init/1 and fails pool startup with an ArgumentError when the module is not found.
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hexContrato de muestraelixir · linux/x64ecto@3.12.5
Se creeEcto.Multi.run/3 accepts a single-argument callback receiving the accumulated changes map, matching other Multi dynamic callbacks and Ecto 2 conventions.
Medidoassert Ecto.Multi.run/3 requires a 2-arity function taking repo and changes and raises FunctionClauseError on a 1-arity function, whereas Multi.insert/3 and Multi.merge/2 accept 1-arity functions receiving only changes
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golangContrato de muestrago · linux/x64net/http@go1.26.5
Se creeOnce net/http drops Authorization for a cross-domain redirect, the header stays absent for the rest of the chain — but before go1.23.7 / go1.24.1, a same-domain hop immediately following a cross-domain hop silently restores Authorization to the request, leaking the credential to the second domain while the HTTP response stays 200.
MedidoAfter a three-hop redirect chain where the first cross-domain hop strips Authorization, the Authorization header must be absent at the same-domain second hop on serverB — before go1.23.7 / go1.24.1 this assertion fails silently with a 200 response.
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golangContrato de muestrago · linux/x64net/http@v1.26.5
Se creeSetting http.Transport.MaxIdleConns to a high value allows all idle connections to a single target host to be pooled when MaxIdleConnsPerHost is left unset.
MedidoLeaving http.Transport.MaxIdleConnsPerHost unset (0) with MaxIdleConns set to 100 retains only 2 idle connections for a host, rejecting the 3rd connection with 'too many idle connections for host'.
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golangContrato de muestrago · linux/x64net/http@go1.22.0
Se creeReadHeaderTimeout enforces a deadline on reading the request body
Medidothe server handler takes >2s to read the request body despite ReadHeaderTimeout=1s
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golangContrato de muestrago · linux/x64net/http@v1.26.5
Se creeCalling resp.Body.Close() — the pattern shown in every tutorial — is sufficient for http.Transport to reclaim and reuse the underlying TCP connection for the next request.
MedidoWhen resp.Body.Close() is called without draining the body first, http.Transport opens a brand-new TCP connection for the very next request to the same host, measured via httptrace.GotConnInfo.Reused being false.
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golangContrato de muestrago · linux/x64net/http@v1.26.5
Se creeA second request on the same `http.Client` should proceed after the first `Do` call returns, even if that first response body is never read or closed.
MedidoA second request using the same `http.Client` and `http.Transport{MaxConnsPerHost: 1}` does not complete while the first response body remains open, returning a context timeout instead.
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golangContrato de muestrago · linux/x64net/http@go1.26.5
Se creeA setting named `GODEBUG=http2server=0` only affects debug output, so an explicit HTTP/2-only setup should still work.
MedidoAn HTTP/2-only client-server pair should negotiate and return `HTTP/2.0` by default, while the same code with `GODEBUG=http2server=0` must fail because no shared protocol is available.
Cómo comprobar cualquier línea de aquí
Abre la muestra, lee su contract y ejecútalo. El contract es la propia prueba de la muestra: se ejecuta sin red en un contenedor fijado, y el recibo firmado de esa ejecución es lo que la red guarda. Nada de esto depende de cómo leamos una biblioteca, solo de lo que la biblioteca hizo.
Algunas muestras publicadas no están en esta página. Su contrato pasó y la muestra está activa, pero ninguna línea de ese contrato se lee como una frase. Una aserción como expect(x).toBe(1), puesta junto a la creencia que comprueba, no le dice nada a quien lee. Preferimos dejarlas fuera antes que publicar pruebas que nadie puede leer.