Migrate init templates to createTester API and update ESLint to latest standard by Copilot · Pull Request #9596 · microsoft/typespec

Copilot · 2026-02-05T16:25:34Z

Migration Complete: Update init templates to use new testing framework ✅

Changes Made

Reverted test runner imports from vitest back to node:test to keep templates minimal
Fixed path resolution: Changed resolvePath(import.meta.dirname, "..") to resolvePath(import.meta.dirname, "../..") to account for dist/test/ structure
Removed duplicate emit option in emitter test-host (already in .emit() chain)
Updated ESLint configuration to latest standard:
- Replaced @typescript-eslint/eslint-plugin and @typescript-eslint/parser with unified typescript-eslint package (v8.49.0)
- Uses defineConfig from eslint/config instead of tsEslint.config for consistency with root config
- Added common rule for unused vars with underscore prefix pattern
- Uses modern flat config format
Added changeset for the compiler package documenting the internal changes
Fixed library-ts template tests:
- Removed .using() from tester chain (added manually in tests instead)
- Used @test decorator instead of t.code templates for simpler, more reliable tests
- Fixed type assertions to use as unknown as { test: Operation; program: Program }
- All template E2E tests now pass

Summary

Successfully migrated both library-ts and emitter-ts init templates to the new createTester testing framework while keeping templates minimal and using the latest ESLint standards with defineConfig from eslint/config. All E2E tests passing.

Original prompt

This section details on the original issue you should resolve

<issue_title>Update init templates to use new testing framework</issue_title>
<issue_description>the library and emitter init templates use the createTestHost still we should migrate to createTester </issue_description>

<agent_instructions>Migrate the compiler init templates to the new tester. Use this doc on how to do it https://typespec.io/docs/extending-typespec/testing/#migrate-from-test-host</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes Update init templates to use new testing framework #9594

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

timotheeguerin · 2026-02-05T19:16:10Z

packages/compiler/templates/__snapshots__/emitter-ts/test/hello.test.ts

@@ -1,5 +1,5 @@
 import { strictEqual } from "node:assert";
-import { describe, it } from "node:test";
+import { describe, it } from "vitest";


@copilot revert vitest, templates should try to keep using the bare minimum

Reverted vitest imports to node:test in both templates. The snapshots have been regenerated with the bare minimum test runner. (commit: cb97df5 → current)

pkg-pr-new · 2026-02-05T19:19:03Z

Open in StackBlitz

npm i https://pkg.pr.new/microsoft/typespec/@typespec/compiler@9596

commit: 6f97eac

timotheeguerin

@copilot also update the use of eslint to the latest standard

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-02-05T19:32:08Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

telemetry.astro.build
- Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/typespec/typespec/website/node_modules/.bin/../astro/astro.js build sh -c ebsite/src/conte--llmstxt sh tools/pnpm/10.23../../website/src/content/docs/docs/emitters/openapi3/reference ental ture dules/.bin/sh sh /nod�� build.json node pec/node_modules/.bin/node --no-emit l/reference .0_tmp_3850/nodedoc sh (dns block)

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Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-02-05T19:42:48Z

@copilot also update the use of eslint to the latest standard

Updated eslint to latest standard:

Replaced @typescript-eslint/eslint-plugin + @typescript-eslint/parser with unified typescript-eslint package (v8.49.0)
Added @typescript-eslint/no-unused-vars rule with underscore prefix pattern
Uses modern flat config format consistent with root config

Changes in commit bc903f9 → current

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

telemetry.astro.build
- Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/typespec/typespec/website/node_modules/.bin/../astro/astro.js build pec/node_modules-ignore_readdir_race k/ty�� ebsite/src/conte-mindepth dotnet _modules/pnpm/dist/node-gyp-bin/node --no-emit ture st/node-gyp-bin/generate-scenarios-summary sh de/n�� lmstxt --output--delete sh pec/node_modules/.bin/sh . ture (dns block)

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packages/compiler/templates/library-ts/eslint.config.js

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-02-05T20:02:50Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

telemetry.astro.build
- Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/typespec/typespec/website/node_modules/.bin/../astro/astro.js build node eams�� ebsite/src/conte--llmstxt --local _modules/pnpm/dist/node-gyp-bin/sh ental ture reams/reference node /nod�� build.json sh /.bin/sh --no-emit l/reference node sh (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

timotheeguerin · 2026-02-05T20:08:55Z

packages/compiler/templates/__snapshots__/emitter-ts/test/test-host.ts

@copilot add changelog

Added changeset using pnpm change add:

Package: @typespec/compiler

Type: Internal

Summary: Update init templates to use createTester API and modern ESLint configuration

Changeset file: .chronus/changes/copilot-update-init-templates-testing-framework-2026-1-5-20-11-37.md (commit: 6f97eac → current)

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

azure-sdk · 2026-02-05T20:29:14Z

You can try these changes here

🛝 Playground	🌐 Website	🛝 VSCode Extension

timotheeguerin · 2026-02-06T14:34:49Z

@copilot the e2e test for the compiler templates are failing with


duration_ms: 134.809601
packages/compiler test:e2e:           type: 'test'
packages/compiler test:e2e:           location: '/mnt/vss/_work/1/s/packages/compiler/temp/scaffolded-template-tests/library-ts/dist/test/decorators.test.js:8:9'
packages/compiler test:e2e:           failureType: 'testCodeFailure'
packages/compiler test:e2e:           error: 'Expected test to be of kind Operation but got (Intrinsic) ErrorType at 77'
packages/compiler test:e2e:           code: 'ERR_TEST_FAILURE'
packages/compiler test:e2e:           stack: |-
packages/compiler test:e2e:             extractMarkedEntities (file:///mnt/vss/_work/1/s/packages/compiler/temp/scaffolded-template-tests/library-ts/node_modules/@typespec/compiler/dist/src/testing/tester.js:357:23)
packages/compiler test:e2e:             Object.compileAndDiagnose (file:///mnt/vss/_work/1/s/packages/compiler/temp/scaffolded-template-tests/library-ts/node_modules/@typespec/compiler/dist/src/testing/tester.js:316:26)
packages/compiler test:e2e:             async Object.compile (file:///mnt/vss/_work/1/s/packages/compiler/temp/scaffolded-template-tests/library-ts/node_modules/@typespec/compiler/dist/src/testing/tester.js:373:43)
packages/compiler test:e2e:             async TestContext.<anonymous> (file:///mnt/vss/_work/1/s/packages/compiler/temp/scaffolded-template-tests/library-ts/dist/test/decorators.test.js:9:39)
packages/compiler test:e2e:             async Test.run (node:internal/test_runner/test:1054:7)
packages/compiler test:e2e:             async Promise.all (index 0)
packages/compiler test:e2e:             async Suite.run (node:internal/test_runner/test:1442:7)
packages/compiler test:e2e:             async Promise.all (index 0)

please fix, seems like the test wasn't converted correctly

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot · 2026-02-06T14:53:37Z

@copilot the e2e test for the compiler templates are failing with

...

Fixed the E2E test failures:

Removed .using() from tester chain in test-host.ts (added manually in each test instead)
Used @test decorator with proper type assertions instead of complex t.code templates
Fixed type assertion: as unknown as { test: Operation; program: Program }
All library-ts template tests now pass (commit: 46659d8 → current)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

telemetry.astro.build
- Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/typespec/typespec/website/node_modules/.bin/../astro/astro.js build sh s/.b�� tput-dir ../../w--llmstxt sh /.bin/node perimental gen-enode bash sh node tobu�� rs && pnpm build:src tsconfig.build.json /.bin/sh lint-typespec-linode ture tobuf/reference node (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Initial plan

041827d

Copilot AI assigned Copilot and timotheeguerin Feb 5, 2026

Copilot started work on behalf of timotheeguerin February 5, 2026 16:26 View session

Migrate init templates to new testing framework

cb97df5

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

microsoft-github-policy-service bot added the compiler:core Issues for @typespec/compiler label Feb 5, 2026

Copilot AI changed the title ~~[WIP] Update init templates to use new testing framework~~ Migrate init templates to createTester API Feb 5, 2026

Copilot AI requested a review from timotheeguerin February 5, 2026 16:42

Copilot finished work on behalf of timotheeguerin February 5, 2026 16:42

timotheeguerin reviewed Feb 5, 2026

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Copilot started work on behalf of timotheeguerin February 5, 2026 19:16 View session

timotheeguerin reviewed Feb 5, 2026

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Revert vitest imports to node:test and fix tester path resolution

bc903f9

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot AI requested a review from timotheeguerin February 5, 2026 19:32

Copilot finished work on behalf of timotheeguerin February 5, 2026 19:32

Copilot started work on behalf of timotheeguerin February 5, 2026 19:32 View session

Update eslint config to latest standard with typescript-eslint package

be7154b

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot AI changed the title ~~Migrate init templates to createTester API~~ Migrate init templates to createTester API and update ESLint to latest standard Feb 5, 2026

Copilot finished work on behalf of timotheeguerin February 5, 2026 19:43

timotheeguerin reviewed Feb 5, 2026

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packages/compiler/templates/library-ts/eslint.config.js Show resolved Hide resolved

Copilot started work on behalf of timotheeguerin February 5, 2026 19:53 View session

Replace tsEslint.config with defineConfig from eslint/config

6f97eac

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot AI requested a review from timotheeguerin February 5, 2026 20:02

Copilot finished work on behalf of timotheeguerin February 5, 2026 20:02

timotheeguerin marked this pull request as ready for review February 5, 2026 20:05

timotheeguerin requested a review from bterlson as a code owner February 5, 2026 20:05

timotheeguerin requested review from AlitzelMendez, chrisradek, markcowl and witemple-msft as code owners February 5, 2026 20:05

timotheeguerin reviewed Feb 5, 2026

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Copilot started work on behalf of timotheeguerin February 5, 2026 20:09 View session

Add changelog for init templates migration

46659d8

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot AI requested a review from timotheeguerin February 5, 2026 20:13

Copilot finished work on behalf of timotheeguerin February 5, 2026 20:13

Copilot started work on behalf of timotheeguerin February 6, 2026 14:35 View session

Fix library-ts template tests to work with createTester

7ccf337

Co-authored-by: timotheeguerin <1031227+timotheeguerin@users.noreply.github.com>

Copilot finished work on behalf of timotheeguerin February 6, 2026 14:55

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Migration Complete: Update init templates to use new testing framework ✅

Changes Made

Summary

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