O que a rede encontrou
Cada linha abaixo é uma medição, não uma opinião. Todas apontam para uma amostra publicada cujo contract é executado em um contêiner fixado e sem rede, então você pode reexecutá-lo e discordar do resultado.
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597 achados em 8 ecossistemas.
- cargo
- composer
- gem
- golang
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- npm
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- pypi
O que a amostra afirma e o contrato dela mede
1–25 de 568, medidos por amostras publicadas.
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pypiContrato da amostrapython · linux 24/x64cffi@2.1.1
Acredita-seCalling ffi.string with maxlen reads the full byte length regardless of null bytes, and ffi.buffer on a pointer defaults to the full allocated buffer length.
MedidoCalling ffi.string(cdata, maxlen) truncates at the first null byte rather than reading maxlen bytes, while ffi.unpack extracts the exact byte count across embedded nulls.
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npmContrato da amostranode · linux 24/x64browserslist@4.28.7
Acredita-seModifying .browserslistrc on disk causes browserslist to automatically pick up the updated target configuration on subsequent queries in a long-running process.
MedidoWhen .browserslistrc is modified on disk during a process lifetime, browserslist continues to return stale cached configurations until browserslist.clearCaches() is explicitly invoked.
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npmContrato da amostranode 22.23 · linux 24/x64@babel/preset-env@7.26.9
Acredita-seModern compilation targets automatically negate all transforms regardless of configuration options like forceAllTransforms, and preset-level settings like bugfixes or loose are not systematically passed to configured plugins.
MedidopresetEnv with forceAllTransforms: true forces all 49 syntax transform plugins to activate even when targeting modern Chrome 120 (which normally requires 17).
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npmContrato da amostranode 22.23 · linux 24/x64@rollup/plugin-commonjs@28.0.2
Acredita-seWhen bundling CommonJS modules that require external dependencies into ESM, @rollup/plugin-commonjs automatically imports them as ES module namespaces or detects external module formats to preserve named exports.
MedidoBy default, @rollup/plugin-commonjs renders external dependencies required in CommonJS modules as default ESM imports rather than namespace imports.
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npmContrato da amostranode 22.23 · linux 24/x64@rollup/plugin-commonjs@28.0.2
Acredita-seWhen bundling CommonJS modules that wrap external require calls inside try-catch blocks into ESM, @rollup/plugin-commonjs always hoists the requires to top-level static imports or always preserves runtime try-catch error handling.
MedidoBy default, @rollup/plugin-commonjs leaves external require calls inside try-catch blocks untransformed as dynamic require() calls, preventing top-level static ESM imports.
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npmContrato da amostranode · linux 24/x64@rollup/plugin-commonjs@28.0.2
Acredita-seWhen bundling CommonJS modules containing dynamic require calls, @rollup/plugin-commonjs resolves dynamic calls automatically or leaves them untouched without requiring explicit configuration.
MedidoBy default, @rollup/plugin-commonjs transforms dynamic require calls into commonjsRequire helper calls that throw an error instructing the user to configure dynamicRequireTargets or ignoreDynamicRequires.
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npmContrato da amostranode 22.23 · linux 24/x64@rollup/plugin-commonjs@29.0.3
Acredita-seWhen bundling CommonJS modules with dynamic require expressions, @rollup/plugin-commonjs either automatically resolves dynamic calls at runtime or silently ignores them without error.
MedidoBy default, @rollup/plugin-commonjs transforms dynamic require calls into commonjsRequire helper calls that throw an error instructing the user to configure dynamicRequireTargets or ignoreDynamicRequires.
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npmContrato da amostranode 22.23 · linux 24/x64@rollup/plugin-commonjs@29.0.3
Acredita-seWhen bundling CommonJS modules that wrap external require calls inside try-catch blocks into ESM, @rollup/plugin-commonjs always hoists the requires to top-level static imports or always preserves runtime try-catch error handling.
MedidoBy default, @rollup/plugin-commonjs leaves external require calls inside try-catch blocks untransformed as dynamic require() calls, preventing top-level static ESM imports.
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npmContrato da amostranode 22.23 · linux 24/x64@rollup/plugin-commonjs@29.0.3
Acredita-seWhen bundling CommonJS modules that require external dependencies into ESM, @rollup/plugin-commonjs automatically imports them as ES module namespaces or detects external module formats to preserve named exports.
MedidoBy default, @rollup/plugin-commonjs renders external dependencies required in CommonJS modules as default ESM imports rather than namespace imports.
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npmContrato da amostranode · linux 24/x64@babel/preset-env@7.26.9
Acredita-seDevelopers expect specifying useBuiltIns alone without corejs to automatically configure polyfill plugins, or expect getPolyfillPlugins to return non-empty default plugins even when useBuiltIns is false or unset.
MedidogetPolyfillPlugins returns an empty array when useBuiltIns is unset, false, or not usage/entry, or when corejs is missing.
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npmContrato da amostralinux 24/x64@rollup/plugin-commonjs@28.0.7
Acredita-seBundling CommonJS code with Rollup leaves dynamic require calls as native runtime require invocations in the output bundle.
Medidoassert @rollup/plugin-commonjs with default ignoreDynamicRequires (false) rewrites dynamic require calls into commonjsRequire helper that throws a runtime error
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npmContrato da amostranode 22.23 · linux 24/x64@babel/preset-env@7.26.9
Acredita-seModern compilation targets automatically negate all transforms regardless of configuration options like forceAllTransforms, and preset-level settings like bugfixes or shippedProposals do not alter plugin resolution counts for modern environments.
MedidopresetEnv with forceAllTransforms: true forces all 49 syntax transform plugins to activate even when targeting modern Chrome 120 (which normally requires 17).
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npmContrato da amostranode 22.23 · linux 24/x64@babel/preset-env@8.0.2
Acredita-seCompilation targets strictly dictate plugin selection, requiring full package names if manually overridden, and include and exclude silently resolve collisions by precedence rather than throwing an error.
MedidoConfiguring the include option with transform-arrow-functions forces transpilation of arrow functions to function expressions even when targeting modern runtimes (such as Chrome 120) that natively support them, while preserving non-included syntax like template literals.
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npmContrato da amostranode 22.23 · linux 24/x64@babel/preset-env@8.0.2
Acredita-seModern compilation targets like Chrome 120 prevent all syntax transformations, forceAllTransforms converts ES module syntax into CommonJS require calls, and exclude is ignored when forceAllTransforms is true.
MedidoWhen forceAllTransforms is omitted or false, @babel/preset-env preserves native modern syntax (arrow functions, template literals, optional chaining) for targets that natively support them.
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npmContrato da amostranode 22.23 · linux 24/x64@rollup/plugin-commonjs@28.0.7
Acredita-seBy default @rollup/plugin-commonjs hoists all CommonJS require calls including those inside try-catch blocks into top-level static imports.
Medidoassert @rollup/plugin-commonjs by default (ignoreTryCatch: true) leaves external require calls inside try-catch blocks unconverted as runtime require statements without hoisting static imports
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npmContrato da amostranode 22.23 · linux 24/x64@babel/preset-env@7.26.0
Acredita-seConfiguring polyfill injection with useBuiltIns 'usage' or 'entry' generates identical plugin lists, and legacy polyfill handling is only applied when corejs version 2 is specified.
Medidoassert useBuiltIns 'usage' with corejs 3 selects pluginCoreJS3 with method 'usage-global' and legacyBabelPolyfillPlugin marked as deprecated
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npmContrato da amostranode · linux 24/x64@babel/preset-env@7.26.0
Acredita-seDisabling module transforms in @babel/preset-env removes all module-related plugins entirely, and requesting dynamic import transformation enables transform-dynamic-import across all formats including UMD.
Medidoassert modules: 'commonjs' with shouldTransformESM maps the module format to its transformation plugin alongside dynamic import and export-namespace transforms
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npmContrato da amostranode · linux 24/x64@rollup/plugin-commonjs@28.0.7
Acredita-seBy default @rollup/plugin-commonjs allows CommonJS modules requiring external ES modules to access both default and named exports.
Medidoassert @rollup/plugin-commonjs with default esmExternals: false emits default imports for external dependencies, causing named exports to be inaccessible (undefined) when required from CommonJS
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npmContrato da amostranode 22.23 · linux 24/x64@babel/preset-env@7.29.7
Acredita-seModern compilation targets automatically negate all transforms regardless of configuration options like forceAllTransforms, and preset-level settings like bugfixes or loose are not systematically passed to configured plugins.
MedidopresetEnv with forceAllTransforms: true forces all 50 syntax transform plugins to activate even when targeting modern Chrome 120 (which normally requires 18).
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npmContrato da amostranode · linux 24/x64@babel/preset-env@7.26.0
Acredita-seTargeting a modern environment like Node 20 prevents syntax transforms like arrow functions from running, and targeting older environments compiles all modern syntax without granular options to selectively force or skip specific transforms.
Medidoassert include with shorthand 'transform-arrow-functions' forces arrow function compilation on targets that natively support them such as node 20
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npmContrato da amostranode 22 · linux 24/x64@babel/preset-env@7.29.7
Acredita-seTarget-based compilation dynamically configures the plugin pipeline, and preset helper utilities resolve feature requirements and partition syntax transforms.
MedidoisPluginRequired returns true when target version is below support requirement, and false when target meets or exceeds requirement.
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npmContrato da amostranode 22 · linux 24/x64@babel/preset-env@7.24.7
Acredita-seTarget-based compilation dynamically configures the plugin pipeline, and preset helper utilities resolve feature requirements and partition syntax transforms.
MedidoisPluginRequired returns true when target version is below support requirement, and false when target meets or exceeds requirement.
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golangContrato da amostrago · linux/x64google.golang.org/protobuf@v1.35.1
Acredita-sereflect.DeepEqual safely compares protobuf messages while proto.Equal behaves identically to standard struct comparisons.
Medidoproto.Equal returns true when comparing two nil proto.Message values, and returns false when comparing a non-nil message with nil.
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pypiContrato da amostrapython · linux/x64pydantic@2.13.4
Acredita-sePydantic field_validators always receive raw uncoerced input by default and can access all sibling fields in ValidationInfo.data regardless of field definition order.
MedidoLeaving field_validator mode unset defaults to 'after', running after core type coercion; inputs that fail core type coercion raise ValidationError before the after-validator executes.
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npmContrato da amostranode 22.23 · linux 24/x64socket.io-client@4.8.1
Acredita-seEmitted events are always intercepted immediately by onAnyOutgoing regardless of connection state, volatile.emit queues offline packets like standard emit, and emitWithAck resolves directly without handling socket.io error-first ack protocol or timeout errors.
Medidoassert volatile emit while disconnected discards event immediately without queuing in sendBuffer whereas regular emit is queued
Como conferir qualquer linha daqui
Abra a amostra, leia o contract dela e execute. O contract é o teste da própria amostra: roda sem rede em um contêiner fixado, e o recibo assinado dessa execução é o que a rede guarda. Nada aqui depende de como lemos uma biblioteca, apenas do que ela fez.
Algumas amostras publicadas não estão nesta página. O contrato delas passou e a amostra está no ar, mas nenhuma linha desse contrato se lê como uma frase. Uma asserção como expect(x).toBe(1), ao lado da crença que verifica, não diz nada a quem lê. Preferimos deixá-las de fora a publicar evidência que ninguém consegue ler.