Exemplo

Verify React 18.3.1 createElement symbol typing, element ref separation, Children traversal and key prefixing, cloneElement, and memo wrappers

sha256:170256debe11f2120014f73ee0159aaa26276eb4eda80606a39845659fba0bff

MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Ambiente declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Ambiente	Contrato	Etapas	Execução
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…	2026-08-26

HOW

Objetivo: Verify React 18.3.1 createElement symbol typing, element ref separation, Children traversal and key prefixing, cloneElement, and memo wrappers
Pacotes: react 18.3.1
Símbolos: React.Children
React.cloneElement
React.createElement
React.forwardRef
React.isValidElement
React.memo
Criado: 2026-08-26T07:41:50Z

React.createElement constructs elements with Symbol.for('react.element') typeof, attaches ref directly to element.ref (leaving props.ref undefined), and places key on element.key.
React.isValidElement validates Symbol.for('react.element') instances and returns false for component functions, memo/forwardRef definitions, plain objects, primitives, and null/undefined.
React.cloneElement shallowly copies and overrides props, replaces or preserves ref/key, coerces key: null to string 'null', and replaces children when trailing arguments are supplied.
React.Children.toArray flattens nested arrays, strips null/undefined/booleans, preserves 0 and empty strings, assigns hierarchical key prefixes, and treats React.Fragment as opaque.
React.Children.count recursively tallies every child slot including null/undefined/booleans, while React.Children.only enforces a single valid React element child and throws on arrays or primitives.
React.Children.map returns null or undefined on null or undefined input, flattens returned arrays, and omits null or undefined mapper return values.
React.memo and React.forwardRef construct wrapper objects with distinctive $$typeof symbols (react.memo, react.forward_ref), custom comparison or render references, and valid element instantiation.

anônimo