[kbn/std] add observable helpers to aid with rxjs 7 upgrade

NOTICE.txt

@@ -118,6 +118,212 @@ THE SOFTWARE.
 This product uses Noto fonts that are licensed under the SIL Open
 Font License, Version 1.1.
 
+---
+We include the `firstValueFrom()` and `lastValueFrom()` helpers
+extracted from the v7-beta.7 version of the RxJS library.
+
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 ---
 Based on the scroll-into-view-if-necessary module from npm
 https://github.com/stipsan/compute-scroll-into-view/blob/master/src/index.ts#L269-L340

packages/kbn-optimizer/README.md

@@ -84,9 +84,9 @@ const config = OptimizerConfig.create({
   dist: true
 });
 
-await runOptimizer(config)
-  .pipe(logOptimizerState(log, config))
-  .toPromise();
+await lastValueFrom(
+  runOptimizer(config).pipe(logOptimizerState(log, config))
+);
 ```
 
 This is essentially what we're doing in [`script/build_kibana_platform_plugins`][Cli] and the new [build system task][BuildTask].

packages/kbn-optimizer/package.json

@@ -14,6 +14,7 @@
     "@babel/core": "^7.11.6",
     "@kbn/babel-preset": "1.0.0",
     "@kbn/dev-utils": "1.0.0",
+    "@kbn/std": "1.0.0",
     "@kbn/ui-shared-deps": "1.0.0",
     "autoprefixer": "^9.7.4",
     "babel-loader": "^8.0.6",

packages/kbn-optimizer/src/cli.ts

@@ -22,6 +22,7 @@ import 'source-map-support/register';
 import Path from 'path';
 
 import { REPO_ROOT } from '@kbn/utils';
+import { lastValueFrom } from '@kbn/std';
 import { run, createFlagError, CiStatsReporter } from '@kbn/dev-utils';
 
 import { logOptimizerState } from './log_optimizer_state';
@@ -136,7 +137,7 @@ run(
       update$ = update$.pipe(reportOptimizerStats(reporter, config, log));
     }
 
-    await update$.pipe(logOptimizerState(log, config)).toPromise();
+    await lastValueFrom(update$.pipe(logOptimizerState(log, config)));
 
     if (updateLimits) {
       updateBundleLimits(log, config);

packages/kbn-optimizer/src/common/event_stream_helpers.test.ts

@@ -18,20 +18,21 @@
  */
 
 import * as Rx from 'rxjs';
-import { toArray, take } from 'rxjs/operators';
+import { take } from 'rxjs/operators';
+import { allValuesFrom } from './rxjs_helpers';
 
 import { summarizeEventStream } from './event_stream_helpers';
 
 it('emits each state with each event, ignoring events when summarizer returns undefined', async () => {
   const event$ = Rx.of(1, 2, 3, 4, 5);
   const initial = 0;
-  const values = await summarizeEventStream(event$, initial, (state, event) => {
-    if (event % 2) {
-      return state + event;
-    }
-  })
-    .pipe(toArray())
-    .toPromise();
+  const values = await allValuesFrom(
+    summarizeEventStream(event$, initial, (state, event) => {
+      if (event % 2) {
+        return state + event;
+      }
+    })
+  );
 
   expect(values).toMatchInlineSnapshot(`
     Array [
@@ -57,15 +58,15 @@ it('emits each state with each event, ignoring events when summarizer returns un
 it('interleaves injected events when source is synchronous', async () => {
   const event$ = Rx.of(1, 7);
   const initial = 0;
-  const values = await summarizeEventStream(event$, initial, (state, event, injectEvent) => {
-    if (event < 5) {
-      injectEvent(event + 2);
-    }
+  const values = await allValuesFrom(
+    summarizeEventStream(event$, initial, (state, event, injectEvent) => {
+      if (event < 5) {
+        injectEvent(event + 2);
+      }
 
-    return state + event;
-  })
-    .pipe(toArray())
-    .toPromise();
+      return state + event;
+    })
+  );
 
   expect(values).toMatchInlineSnapshot(`
     Array [
@@ -95,15 +96,15 @@ it('interleaves injected events when source is synchronous', async () => {
 it('interleaves injected events when source is asynchronous', async () => {
   const event$ = Rx.of(1, 7, Rx.asyncScheduler);
   const initial = 0;
-  const values = await summarizeEventStream(event$, initial, (state, event, injectEvent) => {
-    if (event < 5) {
-      injectEvent(event + 2);
-    }
+  const values = await allValuesFrom(
+    summarizeEventStream(event$, initial, (state, event, injectEvent) => {
+      if (event < 5) {
+        injectEvent(event + 2);
+      }
 
-    return state + event;
-  })
-    .pipe(toArray())
-    .toPromise();
+      return state + event;
+    })
+  );
 
   expect(values).toMatchInlineSnapshot(`
     Array [
@@ -133,17 +134,17 @@ it('interleaves injected events when source is asynchronous', async () => {
 it('interleaves mulitple injected events in order', async () => {
   const event$ = Rx.of(1);
   const initial = 0;
-  const values = await summarizeEventStream(event$, initial, (state, event, injectEvent) => {
-    if (event < 10) {
-      injectEvent(10);
-      injectEvent(20);
-      injectEvent(30);
-    }
-
-    return state + event;
-  })
-    .pipe(toArray())
-    .toPromise();
+  const values = await allValuesFrom(
+    summarizeEventStream(event$, initial, (state, event, injectEvent) => {
+      if (event < 10) {
+        injectEvent(10);
+        injectEvent(20);
+        injectEvent(30);
+      }
+
+      return state + event;
+    })
+  );
 
   expect(values).toMatchInlineSnapshot(`
     Array [
@@ -179,9 +180,9 @@ it('stops an infinite stream when unsubscribed', async () => {
     return prev + event;
   });
 
-  const values = await summarizeEventStream(event$, initial, summarize)
-    .pipe(take(11), toArray())
-    .toPromise();
+  const values = await allValuesFrom(
+    summarizeEventStream(event$, initial, summarize).pipe(take(11))
+  );
 
   expect(values).toMatchInlineSnapshot(`
     Array [