Code Inspection: Invalid imported or declared symbol
Configure inspections: Settings | Editor | Inspections
Show intention actions: AltEnter
Reports any symbol that is declared, imported or exported by an Angular module that is not a module, component, directive, or pipe or can’t be used in the context of the property.
Place the caret at the highlighted line and press AltEnter or click
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Click the arrow next to the inspection you want to suppress and select the necessary suppress action.