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angular__angular/packages/platform-server/test
arturovt 4560f4fdcd fix(core): throw NG0500 instead of a raw TypeError on element hydration mismatch
When hydration locates the DOM node for an ɵɵelementStart/ɵɵdomElementStart
instruction, locateOrCreateElementNodeImpl assumed the located node was
always an Element and called hasSkipHydrationAttrOnRElement(native), which
does native.hasAttribute(...). The check that would normally catch this
class of mismatch, validateMatchingNode, is gated behind `ngDevMode &&` and
is compiled out of production builds. So when a real SSR/hydration
structural mismatch located a Text or Comment node instead of the expected
Element, production builds hit .hasAttribute on a node type that doesn't
have it and crashed with a raw, uncoded TypeError instead of a coded
hydration-mismatch RuntimeError.

Add a cheap, always-on nodeType check ahead of that call. On mismatch it
throws RuntimeError(HYDRATION_NODE_MISMATCH, ngDevMode && '...'), the same
pattern used elsewhere in the codebase, so the descriptive message is only
built in dev mode and production keeps throwing just the bare NG0500 code
without pulling validateMatchingNode's DOM-printing machinery into the
production bundle (verified via the bundling/hydration golden-symbols test,
which is unchanged).
2026-08-13 13:32:34 -07:00
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