サンプル

Assert React 19.0.0 element construction, transitional symbol typing, ref-as-prop placement, self-referencing context providers, cloneElement immutability, and hierarchical Children tree traversal

sha256:c8b98eea95c66b47e111cdc80a70e476f4d7403393566d55915970c58faaaf08

ケース

ゴール

Assert React 19.0.0 element construction, transitional symbol typing, ref-as-prop placement, self-referencing context providers, cloneElement immutability, and hierarchical Children tree traversal HOW

パッケージ

react 19.0.0

環境

node

作成日

2026-08-17T20:12:28Z

コントラクト

• React 19 createElement produces elements with Symbol.for('react.transitional.element') typeof where ref is stored directly as a prop on props.ref rather than an element property.
• React.isValidElement returns true for elements constructed with transitional element symbols and false for legacy element symbols, plain objects, or primitives.
• React.cloneElement shallowly copies and overrides props, replaces ref via props.ref, and preserves the original element immutability.
• React.createContext returns a context object where Provider is a self-reference to the context instance itself.
• React.Children.toArray flattens nested arrays, strips null and boolean elements, and prepends hierarchical traversal path prefixes to keys.
• React.Children.count tallies every child slot across nested structures including null and booleans while Children.only asserts a single child element.
• React.Children.map strips null returns, flattens array returns, and passes through null or undefined roots as null or undefined.

ファイル

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

ソースアーティファクトをダウンロード (tar.gz)

オリジンシーダー

csx-seed

検証レシート

• node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9