Method fromUserField

src/core/FieldMapper.ts:182–184

* @deprecated Use lookupMappingKey() instead for clarity about what is returned * Convert user's property name back to internal field name * This is the reverse of toUserField()

(userPropertyName: string)

	 * This is the reverse of toUserField()
	 */
	fromUserField(userPropertyName: string): keyof FieldMapping | null {
		return this.lookupMappingKey(userPropertyName);
	}

	/**
	 * Validate that a mapping has no empty field names