Deprecate old testing framework in favor of createTester

[Copilot]

Marks the legacy TypeSpec test host API as @deprecated now that all libraries have migrated to the new createTester-based framework.

Deprecated APIs

@typespec/compiler/testing

• Functions: createTestHost, createTestRunner, createTestWrapper, createTestLibrary, findTestPackageRoot
• Types: TestHost, BasicTestRunner, TypeSpecTestLibrary, TypeSpecTestLibraryInit, TestHostConfig, TestFiles, TestHostError, TestWrapperOptions

Per-package XxxTestLibrary exports — deprecated in: @typespec/http, @typespec/rest, @typespec/versioning, @typespec/json-schema, @typespec/xml, @typespec/events, @typespec/sse, @typespec/streams, @typespec/html-program-viewer, @typespec/library-linter, and several non-tracked packages.

Migration

- import { createTestHost, createTestWrapper } from "@typespec/compiler/testing";
- import { HttpTestLibrary } from "@typespec/http/testing";
-
- export async function createMyTestHost() {
-   return createTestHost({ libraries: [HttpTestLibrary] });
- }
- export async function createMyTestRunner() {
-   const host = await createMyTestHost();
-   return createTestWrapper(host, { autoUsings: ["TypeSpec.Http"] });
- }

+ import { resolvePath } from "@typespec/compiler";
+ import { createTester } from "@typespec/compiler/testing";
+
+ export const Tester = createTester(resolvePath(import.meta.dirname, ".."), {
+   libraries: ["@typespec/http"],
+ }).importLibraries().using("Http");

Templates

Removed src/testing/index.ts from the library-ts and emitter-ts scaffold templates — new projects no longer need to generate a XxxTestLibrary export since createTester accepts library names as strings directly.

[pkg-pr-new]

Open in StackBlitz

@typespec/compiler

npm i https://pkg.pr.new/microsoft/typespec/@typespec/compiler@10964

@typespec/emitter-framework

npm i https://pkg.pr.new/microsoft/typespec/@typespec/emitter-framework@10964

@typespec/events

npm i https://pkg.pr.new/microsoft/typespec/@typespec/events@10964

@typespec/html-program-viewer

npm i https://pkg.pr.new/microsoft/typespec/@typespec/html-program-viewer@10964

@typespec/http

npm i https://pkg.pr.new/microsoft/typespec/@typespec/http@10964

@typespec/http-client

npm i https://pkg.pr.new/microsoft/typespec/@typespec/http-client@10964

@typespec/http-client-js

npm i https://pkg.pr.new/microsoft/typespec/@typespec/http-client-js@10964

@typespec/http-server-js

npm i https://pkg.pr.new/microsoft/typespec/@typespec/http-server-js@10964

@typespec/json-schema

npm i https://pkg.pr.new/microsoft/typespec/@typespec/json-schema@10964

@typespec/library-linter

npm i https://pkg.pr.new/microsoft/typespec/@typespec/library-linter@10964

@typespec/rest

npm i https://pkg.pr.new/microsoft/typespec/@typespec/rest@10964

@typespec/sse

npm i https://pkg.pr.new/microsoft/typespec/@typespec/sse@10964

@typespec/streams

npm i https://pkg.pr.new/microsoft/typespec/@typespec/streams@10964

@typespec/versioning

npm i https://pkg.pr.new/microsoft/typespec/@typespec/versioning@10964

@typespec/xml

npm i https://pkg.pr.new/microsoft/typespec/@typespec/xml@10964

commit: c329a7d

[timotheeguerin]

@copilot fix build

git status --porcelain
ERROR: Files above were changed during PR validation, but not included in the PR.
M packages/compiler/templates/scaffolding.json
Include any automated changes such as sample output, spec.html, and ThirdPartyNotices.txt in your PR.

[Copilot]

@copilot fix build

git status --porcelain
ERROR: Files above were changed during PR validation, but not included in the PR.
...

Fixed in the latest commit — removed the library-ts/src/testing/index.ts.mu and emitter-ts/src/testing/index.ts.mu entries from packages/compiler/templates/scaffolding.json to match the deleted template files.