STYLE_REFERENCE_UNDECLARED: CSS uses an undeclared variable or part
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| Severity | Fault | Stage |
|---|---|---|
| error | customer (the source package) | component declaration |
What it means
Section titled “What it means”A stylesheet of the component reads a CSS variable (var(--name)) that the manifest’s cssVars does not declare and the component’s CSS does not define, or names a part (::part(name), [part=name]) that parts does not declare. The declared variables and parts are the component’s whole styling API for the host page, so the build refuses names outside them. Usual causes: a typo, a missing prefix, or a variable used before it was added to cssVars.
How to fix
Section titled “How to fix”Use a name the manifest declares, or declare it: a variable in cssVars (with a type and a default), a part in parts.