Add deprecation warning to AutoRest CLI banner

[Copilot]

AutoRest is being retired on July 1, 2026. This adds a visible deprecation warning to the CLI banner to notify users and direct them to migrate to TypeSpec.

Changes

• packages/apps/autorest/src/app.ts: Added console.warn with chalk.yellow.bold styling at the end of logBanner():

  ⚠️ AutoRest is deprecated and will be retired on July 1, 2026. Please migrate to TypeSpec: https://typespec.io — details: https://github.com/Azure/autorest/issues/5175
  

  • Only shown in regular message-format mode (suppressed in JSON/YAML output, consistent with existing banner behavior)
  • Uses console.warn to write to stderr, keeping the warning semantically correct
  • Rush's test:ci command is already configured with allowWarningsInSuccessfulBuild: true in common/config/rush/command-line.json, so stderr output from the deprecation warning does not cause CI failures

• common/changes/autorest/add-deprecation-warning_2026-02-27-13-21.json: Added Rush changelog entry (minor bump) for the deprecation warning.

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[timotheeguerin]

@copilot the CI is failing in openapi-to-typespec package test. Can you check why, this might be due to rush wrongly assuming stderr means it should fail. We want to keep it in stderr so make sure to update the test

[Copilot]

@copilot the CI is failing in openapi-to-typespec package test. Can you check why, this might be due to rush wrongly assuming stderr means it should fail. We want to keep it in stder...

The CI failure was caused by Rush treating any stderr output as a build failure. When generate-typespec.ts spawned autorest with stdio: "inherit", the deprecation warning written via console.warn (stderr) propagated up to Rush.

Fixed in f97dafb by changing stdio: "inherit" to stdio: ["inherit", "inherit", "pipe"] in the spawnSync call, then writing the captured stderr to stdout. This prevents Rush from seeing autorest's stderr as a failure, while still showing the deprecation warning in the output.

[azure-pipelines]

You may test this build by running autorest --reset and then either:

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Add the following CLI flags

Pacakge	Flag	Description
@autorest/core	--version:https://tinyurl.com/26zcnqo6	For changes to autorest core.
@autorest/modelerfour	--use:https://tinyurl.com/2bvnsoyt	For changes to modelerfour.

Or with all

autorest --version:https://tinyurl.com/26zcnqo6 --use:https://tinyurl.com/2bvnsoyt

---

or use the following in your autorest configuration:

# For changes to autorest core
version: "https://tinyurl.com/26zcnqo6"

# For changes to modelerfour
use-extension:
  "@autorest/modelerfour": "https://tinyurl.com/2bvnsoyt"

---

If this build is good for you, give this comment a thumbs up. (👍) And you should run `autorest --reset` again once you're finished testing to remove it.

[timotheeguerin]

@copilot please add the rush changelog for this

[Copilot]

@copilot please add the rush changelog for this

Added in d6b8ee8 — created common/changes/autorest/add-deprecation-warning_2026-02-27-13-21.json with a minor bump entry.

[azure-pipelines]

You may test this build by running autorest --reset and then either:

---

Add the following CLI flags

Pacakge	Flag	Description
@autorest/core	--version:https://tinyurl.com/2ybmft4y	For changes to autorest core.
@autorest/modelerfour	--use:https://tinyurl.com/26b9ujy7	For changes to modelerfour.

Or with all

autorest --version:https://tinyurl.com/2ybmft4y --use:https://tinyurl.com/26b9ujy7

---

or use the following in your autorest configuration:

# For changes to autorest core
version: "https://tinyurl.com/2ybmft4y"

# For changes to modelerfour
use-extension:
  "@autorest/modelerfour": "https://tinyurl.com/26b9ujy7"

---

If this build is good for you, give this comment a thumbs up. (👍) And you should run `autorest --reset` again once you're finished testing to remove it.