Fix TCGC broken with latest compiler and add e2e tests

.chronus/changes/add_e2e_test-2024-4-10-13-19-5.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@azure-tools/typespec-client-generator-core"
+---
+
+Fix: Crash due to using api from next version of the compiler

eng/pipelines/jobs/e2e-job.yml

@@ -24,4 +24,4 @@ jobs:
         displayName: Cadl Ranch e2e tests
 
       - script: pnpm test:e2e
-        displayName: UI Tests
+        displayName: E2E Tests

packages/typespec-client-generator-core/e2e/basic-latest/main.tsp

@@ -0,0 +1,4 @@
+import "@typespec/rest";
+import "@azure-tools/typespec-client-generator-core";
+
+op ping(): void;

packages/typespec-client-generator-core/e2e/basic-latest/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "@azure-tools/tcgc-test-basic-latest",
+  "dependencies": {
+    "@typespec/compiler": "latest",
+    "@typespec/rest": "latest",
+    "@typespec/http": "latest",
+    "@typespec/versioning": "latest",
+    "@typespec/openapi": "latest",
+    "@typespec/openapi3": "latest",
+    "@azure-tools/typespec-azure-core": "latest",
+    "@azure-tools/typespec-autorest": "latest",
+    "@azure-tools/typespec-azure-resource-manager": "latest"
+  },
+  "private": true
+}

packages/typespec-client-generator-core/e2e/check-latest.e2e.ts

@@ -0,0 +1,84 @@
+import { findTestPackageRoot } from "@typespec/compiler/testing";
+import { SpawnOptions, spawn } from "child_process";
+import { cp, readdir, rm } from "fs/promises";
+import { join, resolve } from "path";
+import { beforeAll, it } from "vitest";
+
+const packageRoot = await findTestPackageRoot(import.meta.url);
+const tempDir = join(packageRoot, "temp/e2e");
+
+let tgzFile: string;
+beforeAll(async () => {
+  await rm(tempDir, { recursive: true, force: true });
+
+  await execSuccessAsync("pnpm", ["pack", "--pack-destination", tempDir]);
+  const files = await readdir(tempDir);
+
+  const filename = files.find((x) => x.startsWith("azure-tools-typespec-client-generator-core-"));
+  if (filename === undefined) {
+    throw new Error(
+      `Cannot resolve package starting with "azure-tools-typespec-client-generator-core-"`
+    );
+  }
+  tgzFile = join(tempDir, filename);
+});
+
+// Make sure it works with the latest version of dependencies and not just the local build.
+it("works with latest version of packages", async () => {
+  const dir = await setupScenario("basic-latest");
+  await execSuccessAsync("npm", ["install", tgzFile], { cwd: dir });
+  await execSuccessAsync("npx", ["tsp", "compile", "."], { cwd: dir });
+});
+
+async function setupScenario(name: string): Promise<string> {
+  const target = resolve(tempDir, name);
+  await cp(resolve(packageRoot, "e2e", name), target, {
+    recursive: true,
+  });
+  return target;
+}
+
+async function execSuccessAsync(command: string, args: string[] = [], options: SpawnOptions = {}) {
+  const result = await execAsync(command, args, options);
+  if (result.exitCode !== 0) {
+    throw new Error(
+      `Command '${command} ${args.join(" ")}' failed with exit code ${result.exitCode}\n` +
+        result.stdio
+    );
+  }
+  return result;
+}
+async function execAsync(
+  command: string,
+  args: string[] = [],
+  options: SpawnOptions = {}
+): Promise<{ exitCode: number; stdio: string; stdout: string; stderr: string; proc: any }> {
+  const child = spawn(command, args, options);
+
+  return new Promise((resolve, reject) => {
+    child.on("error", (error) => {
+      reject(error);
+    });
+    const stdio: Buffer[] = [];
+    const stdout: Buffer[] = [];
+    const stderr: Buffer[] = [];
+    child.stdout?.on("data", (data) => {
+      stdout.push(data);
+      stdio.push(data);
+    });
+    child.stderr?.on("data", (data) => {
+      stderr.push(data);
+      stdio.push(data);
+    });
+
+    child.on("exit", (exitCode) => {
+      resolve({
+        exitCode: exitCode ?? -1,
+        stdio: Buffer.concat(stdio).toString(),
+        stdout: Buffer.concat(stdout).toString(),
+        stderr: Buffer.concat(stderr).toString(),
+        proc: child,
+      });
+    });
+  });
+}

packages/typespec-client-generator-core/package.json

@@ -43,6 +43,7 @@
     "test:watch": "vitest -w",
     "test:ui": "vitest --ui",
     "test:ci": "vitest run --coverage  --reporter=junit --reporter=default",
+    "test:e2e": "vitest run --config ./vitest.config.e2e.ts",
     "lint": "eslint .  --max-warnings=0",
     "lint:fix": "eslint . --fix ",
     "regen-docs": "tspd doc .  --enable-experimental  --output-dir ../../docs/libraries/typespec-client-generator-core/reference"

packages/typespec-client-generator-core/src/public-utils.ts

@@ -15,7 +15,6 @@ import {
   getProjectedName,
   ignoreDiagnostics,
   isErrorModel,
-  isType,
   listServices,
   resolveEncodedName,
 } from "@typespec/compiler";
@@ -196,7 +195,7 @@ export function getLibraryName(
       type.templateMapper.args
         .filter(
           (arg): arg is Model | Enum =>
-            isType(arg) && (arg.kind === "Model" || arg.kind === "Enum") && arg.name.length > 0
+            "kind" in arg && (arg.kind === "Model" || arg.kind === "Enum") && arg.name.length > 0
         )
         .map((arg) => pascalCase(arg.name))
         .join("")

packages/typespec-client-generator-core/src/types.ts

@@ -28,7 +28,6 @@ import {
   ignoreDiagnostics,
   isErrorModel,
   isNeverType,
-  isType,
 } from "@typespec/compiler";
 import {
   Authentication,
@@ -1147,7 +1146,7 @@ function checkAndGetClientType(
     if (context.filterOutCoreModels && isAzureCoreModel(effectivePayloadType)) {
       if (effectivePayloadType.templateMapper && effectivePayloadType.name) {
         effectivePayloadType.templateMapper.args
-          .filter(isType)
+          .filter((arg): arg is Type => "kind" in arg)
           .filter((arg) => arg.kind === "Model" && arg.name)
           .forEach((arg) => {
             retval.push(...diagnostics.pipe(checkAndGetClientType(context, arg, operation)));

packages/typespec-client-generator-core/tsconfig.json

@@ -10,5 +10,5 @@
     "rootDir": ".",
     "tsBuildInfoFile": "temp/tsconfig.tsbuildinfo"
   },
-  "include": ["src/**/*.ts", "test/**/*.ts"]
+  "include": ["src/**/*.ts", "test/**/*.ts", "e2e/**/*.ts"]
 }

packages/typespec-client-generator-core/vitest.config.e2e.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "node",
+    testTimeout: 60_000,
+    isolate: false,
+    coverage: {
+      reporter: ["cobertura", "json", "text"],
+    },
+    outputFile: {
+      junit: "./test-results.xml",
+    },
+
+    include: ["e2e/**/*.e2e.ts"],
+  },
+});