Improvements to webpack tracing, including hot-reload #21652

divmain · 2021-01-29T08:59:35Z

@timneutkens I think this is ready for a review.

I've made some changes to the original design that seem to have paid off. The parenting relationships for traces of normal builds are applied more uniformly, resulting in more intelligible traces:

Hot-reloading is surfaced now, too. I will note, however, that we will want to dig in deeper and find out where the large portion of time at the beginning of hot-reload is spent. Example:

Where did those 180 ms go? At the least, we can now track how long a hot-reload takes, and have a place to start with further investigation.

divmain · 2021-01-29T09:00:46Z

packages/next/build/tracer.ts

@@ -2,6 +2,49 @@ import api, { Span } from '@opentelemetry/api'

 export const tracer = api.trace.getTracer('next', process.env.__NEXT_VERSION)

+const compilerStacks = new WeakMap()
+
+export function stackPush(compiler: any, spanName: string, attrs?: any): any {


Using this approach allowed for easier association between parent and child. The error handling in stackPop down below also helped to identify when the start/stop tracing events were placed incorrectly.

divmain · 2021-01-29T09:01:45Z

packages/next/build/webpack/plugins/profiling-plugin.ts

@@ -14,26 +19,85 @@ function getNormalModuleLoaderHook(compilation: any) {
  return compilation.hooks.normalModuleLoader
 }

+function tracingIsEnabled() {


I found something that works! No need for a top-level span to be present for the plugin to activate.

Should this be moved to tracer.ts so that it can be reused in other places if needed?

ijjk · 2021-01-29T09:10:26Z

Stats from current PR

Default Server Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
buildDuration	10.8s	10.8s	-1ms
nodeModulesSize	75 MB	75 MB	⚠️ +10.9 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.146	2.045	-0.1
/ avg req/sec	1164.98	1222.49	+57.51
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.265	1.288	⚠️ +0.02
/error-in-render avg req/sec	1976.98	1940.43	⚠️ -36.55

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
677f882d2ed8..38ed.js gzip	13.1 kB	13.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-HASH.js gzip	6.63 kB	6.63 kB	✓
webpack-HASH.js gzip	751 B	751 B	✓
Overall change	59.4 kB	59.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_app-2a09aa2..4a98.js gzip	1.28 kB	1.28 kB	✓
_error-8b758..aef6.js gzip	3.46 kB	3.46 kB	✓
hooks-c71ae4..70cd.js gzip	887 B	887 B	✓
index-bbee2f..528b.js gzip	227 B	227 B	✓
link-7faf09b..eba4.js gzip	1.64 kB	1.64 kB	✓
routerDirect..bf84.js gzip	303 B	303 B	✓
withRouter-a..5826.js gzip	302 B	302 B	✓
Overall change	8.09 kB	8.09 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_buildManifest.js gzip	321 B	321 B	✓
Overall change	321 B	321 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
index.html gzip	614 B	614 B	✓
link.html gzip	620 B	620 B	✓
withRouter.html gzip	607 B	607 B	✓
Overall change	1.84 kB	1.84 kB	✓

Serverless Mode

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
buildDuration	12.7s	12.8s	⚠️ +14ms
nodeModulesSize	75 MB	75 MB	⚠️ +10.9 kB

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
677f882d2ed8..38ed.js gzip	13.1 kB	13.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-HASH.js gzip	6.63 kB	6.63 kB	✓
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Overall change	59.4 kB	59.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_app-2a09aa2..4a98.js gzip	1.28 kB	1.28 kB	✓
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hooks-c71ae4..70cd.js gzip	887 B	887 B	✓
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Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_buildManifest.js gzip	321 B	321 B	✓
Overall change	321 B	321 B	✓

Serverless bundles

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
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404.html	2.67 kB	2.67 kB	✓
hooks.html	1.92 kB	1.92 kB	✓
index.js	1 MB	1 MB	✓
link.js	1.06 MB	1.06 MB	✓
routerDirect.js	1.05 MB	1.05 MB	✓
withRouter.js	1.05 MB	1.05 MB	✓
Overall change	5.19 MB	5.19 MB	✓

Webpack 5 Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
buildDuration	13s	13.1s	⚠️ +99ms
nodeModulesSize	75 MB	75 MB	⚠️ +10.9 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.095	2.012	-0.08
/ avg req/sec	1193.37	1242.4	+49.03
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.351	1.363	⚠️ +0.01
/error-in-render avg req/sec	1851.12	1833.76	⚠️ -17.36

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
597-7c719119..27b6.js gzip	13 kB	13 kB	✓
framework.HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	6.58 kB	6.58 kB	✓
webpack-HASH.js gzip	954 B	954 B	✓
Overall change	59.8 kB	59.8 kB	✓

Legacy Client Bundles (polyfills)

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Overall change	31.1 kB	31.1 kB	✓

Client Pages

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hooks-f7e199..11b9.js gzip	904 B	904 B	✓
index-3dc22c..ffbb.js gzip	232 B	232 B	✓
link-c010d28..b60a.js gzip	1.63 kB	1.63 kB	✓
routerDirect..323a.js gzip	308 B	308 B	✓
withRouter-a..2ef8.js gzip	304 B	304 B	✓
Overall change	8.02 kB	8.02 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_buildManifest.js gzip	299 B	299 B	✓
Overall change	299 B	299 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
index.html gzip	585 B	585 B	✓
link.html gzip	592 B	592 B	✓
withRouter.html gzip	579 B	579 B	✓
Overall change	1.76 kB	1.76 kB	✓

Diffs

Diff for index.html

@@ -43,7 +43,7 @@
         "props": { "pageProps": {} },
         "page": "/",
         "query": {},
-        "buildId": "pTe5shWFjyK2oB9lopKxS",
+        "buildId": "DCNosug1KeykeS-5VlE4b",
         "isFallback": false,
         "gip": true
       }
@@ -77,11 +77,11 @@
       async=""
     ></script>
     <script
-      src="/_next/static/pTe5shWFjyK2oB9lopKxS/_buildManifest.js"
+      src="/_next/static/DCNosug1KeykeS-5VlE4b/_buildManifest.js"
       async=""
     ></script>
     <script
-      src="/_next/static/pTe5shWFjyK2oB9lopKxS/_ssgManifest.js"
+      src="/_next/static/DCNosug1KeykeS-5VlE4b/_ssgManifest.js"
       async=""
     ></script>
   </body>

Diff for link.html

@@ -48,7 +48,7 @@
         "props": { "pageProps": {} },
         "page": "/link",
         "query": {},
-        "buildId": "pTe5shWFjyK2oB9lopKxS",
+        "buildId": "DCNosug1KeykeS-5VlE4b",
         "isFallback": false,
         "gip": true
       }
@@ -82,11 +82,11 @@
       async=""
     ></script>
     <script
-      src="/_next/static/pTe5shWFjyK2oB9lopKxS/_buildManifest.js"
+      src="/_next/static/DCNosug1KeykeS-5VlE4b/_buildManifest.js"
       async=""
     ></script>
     <script
-      src="/_next/static/pTe5shWFjyK2oB9lopKxS/_ssgManifest.js"
+      src="/_next/static/DCNosug1KeykeS-5VlE4b/_ssgManifest.js"
       async=""
     ></script>
   </body>

Diff for withRouter.html

@@ -43,7 +43,7 @@
         "props": { "pageProps": {} },
         "page": "/withRouter",
         "query": {},
-        "buildId": "pTe5shWFjyK2oB9lopKxS",
+        "buildId": "DCNosug1KeykeS-5VlE4b",
         "isFallback": false,
         "gip": true
       }
@@ -77,11 +77,11 @@
       async=""
     ></script>
     <script
-      src="/_next/static/pTe5shWFjyK2oB9lopKxS/_buildManifest.js"
+      src="/_next/static/DCNosug1KeykeS-5VlE4b/_buildManifest.js"
       async=""
     ></script>
     <script
-      src="/_next/static/pTe5shWFjyK2oB9lopKxS/_ssgManifest.js"
+      src="/_next/static/DCNosug1KeykeS-5VlE4b/_ssgManifest.js"
       async=""
     ></script>
   </body>

Commit: 24850bb

timneutkens · 2021-01-29T09:54:20Z

Looks great 🚀

ijjk · 2021-01-29T10:06:27Z

Stats from current PR

Default Server Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
buildDuration	11.8s	11.9s	⚠️ +36ms
nodeModulesSize	75 MB	75 MB	⚠️ +11.2 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.476	2.484	⚠️ +0.01
/ avg req/sec	1009.69	1006.59	⚠️ -3.1
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.704	1.683	-0.02
/error-in-render avg req/sec	1467.2	1485.7	+18.5

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
677f882d2ed8..38ed.js gzip	13.1 kB	13.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-HASH.js gzip	6.63 kB	6.63 kB	✓
webpack-HASH.js gzip	751 B	751 B	✓
Overall change	59.4 kB	59.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_app-2a09aa2..4a98.js gzip	1.28 kB	1.28 kB	✓
_error-8b758..aef6.js gzip	3.46 kB	3.46 kB	✓
hooks-c71ae4..70cd.js gzip	887 B	887 B	✓
index-bbee2f..528b.js gzip	227 B	227 B	✓
link-7faf09b..eba4.js gzip	1.64 kB	1.64 kB	✓
routerDirect..bf84.js gzip	303 B	303 B	✓
withRouter-a..5826.js gzip	302 B	302 B	✓
Overall change	8.09 kB	8.09 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_buildManifest.js gzip	321 B	321 B	✓
Overall change	321 B	321 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
index.html gzip	614 B	614 B	✓
link.html gzip	620 B	620 B	✓
withRouter.html gzip	607 B	607 B	✓
Overall change	1.84 kB	1.84 kB	✓

Serverless Mode

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
buildDuration	14.2s	14.3s	⚠️ +42ms
nodeModulesSize	75 MB	75 MB	⚠️ +11.2 kB

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
677f882d2ed8..38ed.js gzip	13.1 kB	13.1 kB	✓
framework.HASH.js gzip	39 kB	39 kB	✓
main-HASH.js gzip	6.63 kB	6.63 kB	✓
webpack-HASH.js gzip	751 B	751 B	✓
Overall change	59.4 kB	59.4 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

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routerDirect..bf84.js gzip	303 B	303 B	✓
withRouter-a..5826.js gzip	302 B	302 B	✓
Overall change	8.09 kB	8.09 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_buildManifest.js gzip	321 B	321 B	✓
Overall change	321 B	321 B	✓

Serverless bundles

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_error.js	1 MB	1 MB	✓
404.html	2.67 kB	2.67 kB	✓
hooks.html	1.92 kB	1.92 kB	✓
index.js	1 MB	1 MB	✓
link.js	1.06 MB	1.06 MB	✓
routerDirect.js	1.05 MB	1.05 MB	✓
withRouter.js	1.05 MB	1.05 MB	✓
Overall change	5.19 MB	5.19 MB	✓

Webpack 5 Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
buildDuration	14.6s	14.5s	-93ms
nodeModulesSize	75 MB	75 MB	⚠️ +11.2 kB

Page Load Tests Overall increase ✓

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.426	2.368	-0.06
/ avg req/sec	1030.41	1055.7	+25.29
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.693	1.673	-0.02
/error-in-render avg req/sec	1476.44	1494.45	+18.01

Client Bundles (main, webpack, commons)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
597-7c719119..27b6.js gzip	13 kB	13 kB	✓
framework.HASH.js gzip	39.3 kB	39.3 kB	✓
main-HASH.js gzip	6.58 kB	6.58 kB	✓
webpack-HASH.js gzip	954 B	954 B	✓
Overall change	59.8 kB	59.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

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_app-6e0a903..b885.js gzip	1.26 kB	1.26 kB	✓
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hooks-f7e199..11b9.js gzip	904 B	904 B	✓
index-3dc22c..ffbb.js gzip	232 B	232 B	✓
link-c010d28..b60a.js gzip	1.63 kB	1.63 kB	✓
routerDirect..323a.js gzip	308 B	308 B	✓
withRouter-a..2ef8.js gzip	304 B	304 B	✓
Overall change	8.02 kB	8.02 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
_buildManifest.js gzip	299 B	299 B	✓
Overall change	299 B	299 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js webpack-tracing	Change
index.html gzip	585 B	585 B	✓
link.html gzip	592 B	592 B	✓
withRouter.html gzip	579 B	579 B	✓
Overall change	1.76 kB	1.76 kB	✓

Diffs

Diff for index.html

@@ -43,7 +43,7 @@
         "props": { "pageProps": {} },
         "page": "/",
         "query": {},
-        "buildId": "GMfRGO87PZvxCwuByD58D",
+        "buildId": "h2ysPGZ9PVJ6deiBh0C8U",
         "isFallback": false,
         "gip": true
       }
@@ -77,11 +77,11 @@
       async=""
     ></script>
     <script
-      src="/_next/static/GMfRGO87PZvxCwuByD58D/_buildManifest.js"
+      src="/_next/static/h2ysPGZ9PVJ6deiBh0C8U/_buildManifest.js"
       async=""
     ></script>
     <script
-      src="/_next/static/GMfRGO87PZvxCwuByD58D/_ssgManifest.js"
+      src="/_next/static/h2ysPGZ9PVJ6deiBh0C8U/_ssgManifest.js"
       async=""
     ></script>
   </body>

Diff for link.html

@@ -48,7 +48,7 @@
         "props": { "pageProps": {} },
         "page": "/link",
         "query": {},
-        "buildId": "GMfRGO87PZvxCwuByD58D",
+        "buildId": "h2ysPGZ9PVJ6deiBh0C8U",
         "isFallback": false,
         "gip": true
       }
@@ -82,11 +82,11 @@
       async=""
     ></script>
     <script
-      src="/_next/static/GMfRGO87PZvxCwuByD58D/_buildManifest.js"
+      src="/_next/static/h2ysPGZ9PVJ6deiBh0C8U/_buildManifest.js"
       async=""
     ></script>
     <script
-      src="/_next/static/GMfRGO87PZvxCwuByD58D/_ssgManifest.js"
+      src="/_next/static/h2ysPGZ9PVJ6deiBh0C8U/_ssgManifest.js"
       async=""
     ></script>
   </body>

Diff for withRouter.html

@@ -43,7 +43,7 @@
         "props": { "pageProps": {} },
         "page": "/withRouter",
         "query": {},
-        "buildId": "GMfRGO87PZvxCwuByD58D",
+        "buildId": "h2ysPGZ9PVJ6deiBh0C8U",
         "isFallback": false,
         "gip": true
       }
@@ -77,11 +77,11 @@
       async=""
     ></script>
     <script
-      src="/_next/static/GMfRGO87PZvxCwuByD58D/_buildManifest.js"
+      src="/_next/static/h2ysPGZ9PVJ6deiBh0C8U/_buildManifest.js"
       async=""
     ></script>
     <script
-      src="/_next/static/GMfRGO87PZvxCwuByD58D/_ssgManifest.js"
+      src="/_next/static/h2ysPGZ9PVJ6deiBh0C8U/_ssgManifest.js"
       async=""
     ></script>
   </body>

Commit: dc54680

weyert · 2021-01-29T16:05:36Z

Would this allow as a consumer of next.js to get visibility when having a SSR application? I would delighted to be able to get traces to Google Trace via its OpenTracing exporter

Dale Bustad added 12 commits January 27, 2021 15:39

Add granular Webpack tracing

600f161

Add tracing for hot reload.

ae3e542

Create new spans with correct context.

7b0f8c0

Fix typo.

96095b6

Improve intrumentation-detection, move map into class.

e1ff565

Make 'compile' span accessible via spans export.

4064ec7

Fix instrumentation detection.

c664775

Re-parent telemetry events to 'webpack-compile'.

3b38a7d

Use stack-based approach for associating spans.

93becc2

Remove extraneous hot-reloader noise.

31c6e1e

Clean up.

11fc4b7

Use different hook for webpack hot-reload invalidation.

24850bb

divmain requested a review from timneutkens January 29, 2021 08:59

divmain requested review from ijjk, lfades and Timer as code owners January 29, 2021 08:59

ijjk added the type: next label Jan 29, 2021

divmain commented Jan 29, 2021

View reviewed changes

divmain changed the title ~~Webpack tracing~~ Improvements to webpack tracing, including hot-reload Jan 29, 2021

Make sure attributes are generated at the correct time

b57819d

timneutkens approved these changes Jan 29, 2021

View reviewed changes

Merge branch 'canary' into webpack-tracing

dc54680

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kodiakhq bot merged commit 652a1e8 into canary Jan 29, 2021

kodiakhq bot deleted the webpack-tracing branch January 29, 2021 10:32

This was referenced Aug 4, 2021

[Snyk] Security upgrade next from 9.5.5 to 10.0.6 elad165/next.js#402

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[Snyk] Security upgrade next from 9.5.5 to 10.0.6 baby636/next.js#133

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snyk-bot mentioned this pull request Dec 16, 2021

[Snyk] Fix for 3 vulnerabilities lethu96/next.js#28

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vercel locked as resolved and limited conversation to collaborators Jan 29, 2022

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Improvements to webpack tracing, including hot-reload #21652

Improvements to webpack tracing, including hot-reload #21652

divmain commented Jan 29, 2021

divmain Jan 29, 2021 •

edited

divmain Jan 29, 2021

timneutkens Jan 29, 2021

ijjk commented Jan 29, 2021

Diffs

timneutkens commented Jan 29, 2021

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ijjk commented Jan 29, 2021

Diffs

weyert commented Jan 29, 2021

Improvements to webpack tracing, including hot-reload #21652

Improvements to webpack tracing, including hot-reload #21652

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divmain commented Jan 29, 2021

divmain Jan 29, 2021 • edited

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ijjk commented Jan 29, 2021

Stats from current PR

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ijjk commented Jan 29, 2021

Stats from current PR

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weyert commented Jan 29, 2021

divmain Jan 29, 2021 •

edited