QGIS/python/plugins/processing/algs/grass7/description/v.distance.txt

v.distance
Finds the nearest element in vector map 'to' for elements in vector map 'from'.
Vector (v.*)
QgsProcessingParameterVectorLayer|from|'from' vector map|-1|None|False
*QgsProcessingParameterEnum|from_type|'from' feature type|point;line;boundary;area;centroid|True|0,1,3|True
QgsProcessingParameterVectorLayer|to|'to' vector map|-1|None|False
*QgsProcessingParameterEnum|to_type|'to' feature type|point;line;boundary;area;centroid|True|0,1,3|True
QgsProcessingParameterNumber|dmax|Maximum distance or -1.0 for no limit|QgsProcessingParameterNumber.Double|-1.0|True|-1.0|None
QgsProcessingParameterNumber|dmin|Minimum distance or -1.0 for no limit|QgsProcessingParameterNumber.Double|-1.0|True|-1.0|None
QgsProcessingParameterEnum|upload|'upload': Values describing the relation between two nearest features|cat;dist;to_x;to_y;to_along;to_angle;to_attr)|True|0|False
QgsProcessingParameterField|column|Column name(s) where values specified by 'upload' option will be uploaded|None|from|0|True|False
QgsProcessingParameterField|to_column|Column name of nearest feature (used with upload=to_attr)|None|to|-1|False|True
QgsProcessingParameterVectorDestination|from_output|Nearest
QgsProcessingParameterVectorDestination|output|Distance