Make changes required for Desktop FS updates (#1099)

Make a set of changes required for Desktop FS improvements, see
https://github.com/gristlabs/grist-desktop/pull/42

---------

Co-authored-by: Spoffy <contact@spoffy.net>
Co-authored-by: Spoffy <4805393+Spoffy@users.noreply.github.com>

app/gen-server/lib/homedb/HomeDBManager.ts

@@ -68,12 +68,12 @@ import {Request} from "express";
 import {defaultsDeep, flatten, pick} from 'lodash';
 import {
   Brackets,
-  Connection,
   DatabaseType,
+  DataSource,
   EntityManager,
   ObjectLiteral,
   SelectQueryBuilder,
-  WhereExpression
+  WhereExpressionBuilder
 } from "typeorm";
 import uuidv4 from "uuid/v4";
 
@@ -247,7 +247,7 @@ export type BillingOptions = Partial<Pick<BillingAccount,
  */
 export class HomeDBManager extends EventEmitter {
   private _usersManager = new UsersManager(this, this._runInTransaction.bind(this));
-  private _connection: Connection;
+  private _connection: DataSource;
   private _exampleWorkspaceId: number;
   private _exampleOrgId: number;
   private _idPrefix: string = "";  // Place this before ids in subdomains, used in routing to
@@ -353,7 +353,7 @@ export class HomeDBManager extends EventEmitter {
     this._connection = await getOrCreateConnection();
   }
 
-  public connectTo(connection: Connection) {
+  public connectTo(connection: DataSource) {
     this._connection = connection;
   }
 
@@ -987,6 +987,10 @@ export class HomeDBManager extends EventEmitter {
     return doc;
   }
 
+  public async getAllDocs() {
+    return this.connection.getRepository(Document).find();
+  }
+
   public async getRawDocById(docId: string, transaction?: EntityManager) {
     return await this.getDoc({
       urlId: docId,
@@ -3438,7 +3442,7 @@ export class HomeDBManager extends EventEmitter {
   // Adds a where clause to filter orgs by domain or id.
   // If org is null, filter for user's personal org.
   // if includeSupport is true, include the org of the support@ user (for the Samples workspace)
-  private _whereOrg<T extends WhereExpression>(qb: T, org: string|number, includeSupport = false): T {
+  private _whereOrg<T extends WhereExpressionBuilder>(qb: T, org: string|number, includeSupport = false): T {
     if (this.isMergedOrg(org)) {
       // Select from universe of personal orgs.
       // Don't panic though!  While this means that SQL can't use an organization id
@@ -3458,7 +3462,7 @@ export class HomeDBManager extends EventEmitter {
     }
   }
 
-  private _wherePlainOrg<T extends WhereExpression>(qb: T, org: string|number): T {
+  private _wherePlainOrg<T extends WhereExpressionBuilder>(qb: T, org: string|number): T {
     if (typeof org === 'number') {
       return qb.andWhere('orgs.id = :org', {org});
     }