示例

Handle React.Children key rewriting, Fragment opacity, null return shapes in map, and cloneElement key string coercion traps in React

sha256:40432561f0a52d20a9a1ac819998ffd8ede83d0436787b49bcf7949a41cf71a9

PUBLISHED L3_CONTRACT_PASS MIT-0

案例

目标: Handle React.Children key rewriting, Fragment opacity, null return shapes in map, and cloneElement key string coercion traps in React HOW
包: react 19.0.0
环境: node
创建时间: 2026-08-16T07:54:04Z

assert React.Children.toArray rewrites user keys with '.$' prefix, assigns '.0' to unkeyed items, and recursively flattens nested arrays with index prefixes
assert React.Children.toArray and Children.count treat React.Fragment as a single opaque element without unwrapping its children
assert React.Children.toArray filters out null, undefined, and booleans while strictly preserving numeric 0 and empty string
assert React.Children.map returns null or undefined on null or undefined input instead of an empty array, and flattens array return values
assert React.Children.only throws on arrays (including single-item arrays) and primitives, requiring a single valid React element
assert React.cloneElement preserves keys when passed key: undefined, coerces key: null to string 'null', and gives precedence to trailing children arguments

node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-16 · ed25519:d91480838ac982c9