Move streams utils to the core (#76397) (#76609)

* move utils/streams to the KP

* allow imports from src/core/server/utils

* ts-ify

* import streams from KP

* remove unnecessary ts-expect-error

* fix kbn-es-archiver build

* lost export

* copy array in createListStream

* remove streams from legacy utils

Co-authored-by: spalger <spalger@users.noreply.github.com>

Co-authored-by: spalger <spalger@users.noreply.github.com>

Author: mshustov

.eslintrc.js

@@ -311,6 +311,8 @@ module.exports = {
                   '!src/core/server/mocks{,.ts}',
                   '!src/core/server/types{,.ts}',
                   '!src/core/server/test_utils{,.ts}',
+                  '!src/core/server/utils', // ts alias
+                  '!src/core/server/utils/**/*',
                   // for absolute imports until fixed in
                   // https://github.com/elastic/kibana/issues/36096
                   '!src/core/server/*.test.mocks{,.ts}',

src/cli_keystore/add.js

@@ -19,7 +19,7 @@
 
 import { Logger } from '../cli_plugin/lib/logger';
 import { confirm, question } from '../legacy/server/utils';
-import { createPromiseFromStreams, createConcatStream } from '../legacy/utils';
+import { createPromiseFromStreams, createConcatStream } from '../core/server/utils';
 
 /**
  * @param {Keystore} keystore

src/core/server/saved_objects/export/get_sorted_objects_for_export.test.ts

@@ -20,7 +20,7 @@
 import { exportSavedObjectsToStream } from './get_sorted_objects_for_export';
 import { savedObjectsClientMock } from '../service/saved_objects_client.mock';
 import { Readable } from 'stream';
-import { createPromiseFromStreams, createConcatStream } from '../../../../legacy/utils/streams';
+import { createPromiseFromStreams, createConcatStream } from '../../utils/streams';
 
 async function readStreamToCompletion(stream: Readable) {
   return createPromiseFromStreams([stream, createConcatStream([])]);

src/core/server/saved_objects/export/get_sorted_objects_for_export.ts

@@ -18,7 +18,7 @@
  */
 
 import Boom from 'boom';
-import { createListStream } from '../../../../legacy/utils/streams';
+import { createListStream } from '../../utils/streams';
 import { SavedObjectsClientContract, SavedObject } from '../types';
 import { fetchNestedDependencies } from './inject_nested_depdendencies';
 import { sortObjects } from './sort_objects';

src/core/server/saved_objects/import/collect_saved_objects.ts

@@ -23,7 +23,7 @@ import {
   createFilterStream,
   createMapStream,
   createPromiseFromStreams,
-} from '../../../../legacy/utils/streams';
+} from '../../utils/streams';
 import { SavedObject } from '../types';
 import { createLimitStream } from './create_limit_stream';
 import { SavedObjectsImportError } from './types';

src/core/server/saved_objects/import/create_limit_stream.test.ts

@@ -21,7 +21,7 @@ import {
   createConcatStream,
   createListStream,
   createPromiseFromStreams,
-} from '../../../../legacy/utils/streams';
+} from '../../utils/streams';
 import { createLimitStream } from './create_limit_stream';
 
 describe('createLimitStream()', () => {

src/core/server/saved_objects/routes/export.ts

@@ -19,11 +19,7 @@
 
 import { schema } from '@kbn/config-schema';
 import stringify from 'json-stable-stringify';
-import {
-  createPromiseFromStreams,
-  createMapStream,
-  createConcatStream,
-} from '../../../../legacy/utils/streams';
+import { createPromiseFromStreams, createMapStream, createConcatStream } from '../../utils/streams';
 import { IRouter } from '../../http';
 import { SavedObjectConfig } from '../saved_objects_config';
 import { exportSavedObjectsToStream } from '../export';

src/core/server/saved_objects/routes/integration_tests/export.test.ts

@@ -22,7 +22,7 @@ jest.mock('../../export', () => ({
 }));
 
 import * as exportMock from '../../export';
-import { createListStream } from '../../../../../legacy/utils/streams';
+import { createListStream } from '../../../utils/streams';
 import supertest from 'supertest';
 import { UnwrapPromise } from '@kbn/utility-types';
 import { SavedObjectConfig } from '../../saved_objects_config';

src/core/server/saved_objects/routes/utils.test.ts

@@ -19,7 +19,7 @@
 
 import { createSavedObjectsStreamFromNdJson, validateTypes, validateObjects } from './utils';
 import { Readable } from 'stream';
-import { createPromiseFromStreams, createConcatStream } from '../../../../legacy/utils/streams';
+import { createPromiseFromStreams, createConcatStream } from '../../utils/streams';
 
 async function readStreamToCompletion(stream: Readable) {
   return createPromiseFromStreams([stream, createConcatStream([])]);

src/core/server/saved_objects/routes/utils.ts

@@ -19,11 +19,7 @@
 
 import { Readable } from 'stream';
 import { SavedObject, SavedObjectsExportResultDetails } from 'src/core/server';
-import {
-  createSplitStream,
-  createMapStream,
-  createFilterStream,
-} from '../../../../legacy/utils/streams';
+import { createSplitStream, createMapStream, createFilterStream } from '../../utils/streams';
 
 export function createSavedObjectsStreamFromNdJson(ndJsonStream: Readable) {
   return ndJsonStream