Пример

Verify React 18.2.0 createElement symbol typing, element ref separation, Children traversal and key prefixing, cloneElement, memo, and forwardRef wrappers

sha256:f4fe7fad4e5332e7ba61ae6f9a2f6369fe58bfe63e6f18cd6e988685ff3b4103

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Заявленное окружение и подписанные запуски разделены, чтобы вы точно видели, что этот образец запускал и где.

Заявленная среда linux 24 · ubuntu · glibc 2.39 x64 npm

Окружение	Контракт	Этапы	Запуск
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

Цель: Verify React 18.2.0 createElement symbol typing, element ref separation, Children traversal and key prefixing, cloneElement, memo, and forwardRef wrappers
Пакеты: react 18.2.0
Символы: React.Children
React.cloneElement
React.createElement
React.forwardRef
React.isValidElement
React.memo
Создан: 2026-08-26T07:45:00Z

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.

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