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type FontFeature = object;
Identifies a typographic feature in the OpenType font.
optional applyLastAlternative?: boolean;
Indicates whether the last alternative should be applied if the specified position exceeds the number of alternatives.
optional enabled?: boolean;
Indicates whether the feature should be enabled.
featureTag: string;
The OpenType name identifier of the feature.
optional parameter?: number;
1-based position of the alternate glyph ID in Alternate Substitution lookup.