Minimal(ish) repro for typescript@5.4.0-dev.20231222 issue

This shows a failure mode around a package which (oddly!) publishes an
`index.ts` file in its root but also specifies both the `types` and
`exports.types` keys in `package.json` as pointing to an emitted `.d.ts`
file in a `dist` directory. If the `index.ts` is removed or renamed,
`tsc` correctly uses `types` to resolve the location.

This appears to have been introduced by microsoft/TypeScript#55015.

.gitignore

@@ -0,0 +1,130 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

package.json

@@ -0,0 +1,18 @@
+{
+  "name": "repro-ts-5.4-glimmer-exports-issue",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@glimmer/manager": "^0.87.1"
+  },
+  "devDependencies": {
+    "typescript": "5.4.0-dev.20240109"
+  }
+}

src/index.ts

@@ -0,0 +1,4 @@
+import { getInternalComponentManager } from "@glimmer/manager";
+
+class Helper {}
+export const Foo = getInternalComponentManager(Helper);

tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "es2022", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
+    "moduleResolution": "node", /* Specify how TypeScript looks up a file from a given module specifier. */
+    "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+    "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
+    "outDir": "./dist", /* Specify an output folder for all emitted files. */
+    "esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
+    "forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
+    "strict": true, /* Enable all strict type-checking options. */
+    "skipLibCheck": true /* Skip type checking all .d.ts files. */
+  }
+}