Stop building test files (#9333)

fix #9232
Refactor how our tsconfig are setup so it won't build the test files.

Goal
- tsconfig.json -> not used for building, don't include/exclude files so
just can be used by IDE for checking non project files(vitest.config.ts,
etc.)
- tsconfig.build.json -> actual config used for building


The change involve for most
- rename tsconfig.json to tsconfig.build.json
- rename tsconfig.config.json to tsconfig.json
- change `tsc -p .` to `tsp -p tsconfig.build.json`

Author: timotheeguerin

.chronus/changes/no-build-test-2026-0-12-16-21-29.md

@@ -4,7 +4,7 @@ inputs:
   node-version:
     required: false
     description: Node version for setup-node
-    default: 20.x
+    default: 24.x
 
 runs:
   using: composite

.github/actions/setup/action.yml

@@ -3,10 +3,11 @@ import eslint from "@eslint/js";
 import vitest from "@vitest/eslint-plugin";
 import reactHooks from "eslint-plugin-react-hooks";
 import unicorn from "eslint-plugin-unicorn";
+import { defineConfig } from "eslint/config";
 import tsEslint from "typescript-eslint";
 
 /** Config that will apply to all files */
-const allFilesConfig = tsEslint.config({
+const allFilesConfig = defineConfig({
   plugins: {
     unicorn,
   },
@@ -71,7 +72,7 @@ const allFilesConfig = tsEslint.config({
  * @param {string} root
  */
 export function getTypeScriptProjectRules(root) {
-  return tsEslint.config({
+  return defineConfig({
     files: [
       "**/packages/*/src/**/*.ts",
       "**/packages/*/src/**/*.tsx",
@@ -96,7 +97,7 @@ export function getTypeScriptProjectRules(root) {
 }
 
 /** Config that will apply to all test files only */
-const testFilesConfig = tsEslint.config({
+const testFilesConfig = defineConfig({
   /**
    * Test files specific rules
    */
@@ -117,8 +118,9 @@ const testFilesConfig = tsEslint.config({
   },
 });
 
-const jsxFilesConfig = tsEslint.config({
+const jsxFilesConfig = defineConfig({
   files: ["**/*.tsx"],
+  // @ts-expect-error --- plugins typing issue
   plugins: { "react-hooks": reactHooks },
   // Exclude need **/ to make sure this can be reused in typespec-azure
   ignores: ["**/packages/emitter-framework/src/**/*", "**/packages/http-client-js/**/*"],
@@ -136,7 +138,7 @@ export const TypeSpecCommonEslintConfigs = [
   ...testFilesConfig,
 ];
 
-export default tsEslint.config(
+export default defineConfig(
   {
     ignores: [
       "**/dist/**/*",

eslint.config.js

@@ -27,8 +27,8 @@
   },
   "scripts": {
     "clean": "rimraf ./dist ./temp",
-    "build": "tsc -p .",
-    "watch": "tsc -p . --watch",
+    "build": "tsc -p tsconfig.build.json",
+    "watch": "tsc -p tsconfig.build.json --watch",
     "test": "vitest run",
     "test:watch": "vitest -w",
     "test:ui": "vitest --ui",

packages/asset-emitter/package.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src/**/*.ts", "test/**/*.ts"]
+}

packages/asset-emitter/tsconfig.build.json

@@ -6,6 +6,5 @@
     "rootDir": ".",
     "tsBuildInfoFile": "temp/tsconfig.tsbuildinfo",
     "verbatimModuleSyntax": true
-  },
-  "include": ["src/**/*.ts", "test/**/*.ts"]
+  }
 }

packages/asset-emitter/tsconfig.config.json

@@ -27,8 +27,8 @@
   },
   "scripts": {
     "clean": "rimraf ./dist ./temp",
-    "build": "tsc -p .",
-    "watch": "tsc -p . --watch",
+    "build": "tsc -p tsconfig.build.json",
+    "watch": "tsc -p tsconfig.build.json --watch",
     "test": "vitest run",
     "test:ui": "vitest --ui",
     "test:ci": "vitest run --coverage --reporter=junit --reporter=default",

packages/asset-emitter/tsconfig.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src/**/*.ts", "test/**/*.ts"]
+}