private async _getFieldsToCreate()

in src/Common/ProcessImporter.ts [48:92]
41 lines of code
10 McCabe index (conditional complexity)

    private async _getFieldsToCreate(payload: IProcessPayload): Promise<WITProcessDefinitionsInterfaces.FieldModel[]> {
        assert(payload.targetAccountInformation && payload.targetAccountInformation.fieldRefNameToPicklistId, "[Unexpected] - targetInformation not properly populated");

        let fieldsOnTarget: WITInterfaces.WorkItemField[];
        try {
            fieldsOnTarget = await this._witApi.getFields();
            if (!fieldsOnTarget || fieldsOnTarget.length <= 0) { // most likely 404
                throw new ImportError("Failed to get fields from target account, server returned empty result");
            }
        }
        catch (error) {
            Utility.handleKnownError(error);
            throw new ImportError("Failed to get fields from target account, see logs for details.")
        }

        // Build a lookup to know if a field is picklist field.
        const isPicklistField: IDictionaryStringTo<boolean> = {};
        for (const e of payload.witFieldPicklists) {
            isPicklistField[e.fieldRefName] = true;
        }

        const outputFields: WITProcessDefinitionsInterfaces.FieldModel[] = [];
        for (const sourceField of payload.fields) {
            const fieldExist = fieldsOnTarget.some(targetField => targetField.referenceName === sourceField.id);
            if (!fieldExist) {
                const createField: WITProcessDefinitionsInterfaces.FieldModel = Utility.WITProcessToWITProcessDefinitionsFieldModel(sourceField);
                if (sourceField.isIdentity) {
                    createField.type = WITProcessDefinitionsInterfaces.FieldType.Identity;
                }
                if (isPicklistField[sourceField.id]) {
                    const picklistId = payload.targetAccountInformation.fieldRefNameToPicklistId[sourceField.id];
                    assert(picklistId !== PICKLIST_NO_ACTION, "[Unexpected] We are creating the field which we found the matching field earlier on collection")
                    createField.pickList = {
                        id: picklistId,
                        isSuggested: null,
                        name: null,
                        type: null,
                        url: null
                    };
                }
                outputFields.push(createField);
            }
        }
        return outputFields;
    }