サンプル

Prove fast-xml-parser 5.11.0 XMLParser parses single-child elements into plain objects unless configured with isArray to enforce array wrapping.

sha256:f2d01768dace0889403cb29226309050dae3887a3b9b877b211ac881494d3411

MIT-0

実行証拠

宣言環境と署名済み検証実行を分け、証明範囲を明確にします。

宣言された環境 node linux x64 node node npm

環境	コントラクト	ステージ	実行日
node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1	2026-08-19
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1	2026-08-19

HOW

ゴール: Prove fast-xml-parser 5.11.0 XMLParser parses single-child elements into plain objects unless configured with isArray to enforce array wrapping.
パッケージ: fast-xml-parser 5.11.0
シンボル: XMLParser
環境: node
作成日: 2026-08-19T13:20:02Z

XMLParser parses single-child elements into plain objects rather than 1-element arrays by default, causing array methods like map to throw TypeError, unless the isArray callback explicitly returns true for the tag or jPath.
An XML document with multiple same-name sibling tags produces an Array by default without requiring the isArray option.
The isArray callback receives tagName, jPath, isLeafNode, and isAttribute arguments during parsing to selectively enforce array wrapping.
When isAttribute is true, the isArray callback forces attribute values into single-element arrays.
Single-element nodes configured via isArray maintain array methods like map and filter without requiring runtime type guards.