https://github.com/microsoft/TypeScript/issues/59329

Author: wjhsf

.gitignore

@@ -0,0 +1 @@
+node_modules

index.ts

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+// This file includes multiple different types of imports. Specifying different
+// "module" and "moduleResolution" compiler options will result in different
+// imports working (or not). That behavior is expected. But when the "typeRoots"
+// compiler option is explicitly set to the default value, the number of
+// resolved imports changes. That behavior is unexpected.
+
+import { file } from "pkg"
+import { file as index} from "pkg/index"
+import { file as indexJs} from "pkg/index.js"
+import {file as internal} from "pkg/internal"
+import {file as internalJs} from "pkg/internal.js"
+import {file as external} from "pkg/external"
+import {file as externalJs} from "pkg/external.js"
+import {file as exports} from "pkg/exports"

package-lock.json

@@ -0,0 +1,9 @@
+{
+  "dependencies": {
+    "@types/pkg": "file:pkg",
+    "typescript": "^5.5.4"
+  },
+  "scripts": {
+    "test": "tsc"
+  }
+}

package.json

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+export const file = "external"

pkg/external.d.ts

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+export const file = "index"

pkg/index.d.ts

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+export const file = "internal"

pkg/internal.d.ts

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+{
+  "name": "@types/pkg",
+  "version": "1.0.0",
+  "types": "./index.d.ts",
+  "exports": {
+    "exports": "./external.d.ts"
+  }
+}

pkg/package.json

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+{
+  "files": ["index.ts"],
+  "compilerOptions": {
+    "noEmit": true,
+
+    // When "typeRoots" is not specified, this project has 8 compiler errors.
+    // When "typeRoots" is specified, this project has 1 compiler error.
+    // Other configs that
+    // "typeRoots": ["./node_modules/@types"],
+
+    "module": "Node16",
+    "moduleResolution": "Node16",
+    // Preserve/Node10, Preserve/Bundler, and ES2015+/Bundler all have
+    // differences in behavior depending on the presence of "typeRoots".
+    // "moduleResolution": "Node10",
+    // "moduleResolution": "Bundler"
+    // "module": "Preserve",
+    // "module": "ES2015",
+    // "module": "ES2020",
+    // "module": "ES2022",
+    // "module": "ESNext",
+  }
+}