Rename *.d.ts to *.d.mts. Close #17241

Add a type test for legacy.

- https://www.typescriptlang.org/docs/handbook/modules/reference.html#file-extension-substitution

test/types/legacy.ts

@@ -0,0 +1,23 @@
+import { getDocument } from "pdfjs-dist/legacy/build/pdf.mjs";
+import { EventBus } from "pdfjs-dist/legacy/web/pdf_viewer.mjs";
+
+class MainTest {
+  eventBus: EventBus;
+  task: ReturnType<typeof getDocument> | undefined;
+
+  constructor(public file: string) {
+    this.eventBus = new EventBus();
+  }
+
+  loadPdf() {
+    this.task = getDocument("file://" + this.file);
+    return this.task.promise;
+  }
+}
+
+// This is actually never called, as the test only consists in compiling the file.
+// The compilation will crawl through all files and make sure that the types are consistent.
+const mt = new MainTest("../pdfs/basicapi.pdf");
+mt.loadPdf().then(() => {
+  console.log("loaded");
+});

test/types/modern.ts

@@ -1,5 +1,5 @@
 import { getDocument } from "pdfjs-dist";
-import { EventBus } from "pdfjs-dist/web/pdf_viewer.component";
+import { EventBus } from "pdfjs-dist/web/pdf_viewer.mjs";
 
 class MainTest {
   eventBus: EventBus;

test/types/package.json

@@ -0,0 +1,6 @@
+{
+  "type": "module",
+  "dependencies": {
+    "pdfjs-dist": "../../build/typestest/"
+  }
+}

test/types/tsconfig.json

@@ -3,7 +3,7 @@
     "outDir": "../../build/tmp",
     "sourceMap": true,
     "declaration": false,
-    "moduleResolution": "node",
+    "moduleResolution": "node10",
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
     "target": "ESNext",
@@ -17,10 +17,10 @@
     ],
     "paths": {
       "pdfjs-dist": ["../../build/typestest"],
-      "pdfjs-dist/*": ["../../build/typestest/types/*"]
+      "pdfjs-dist/*": ["../../build/typestest/*"]
     }
   },
-  "files": [
-    "main.ts"
+  "exclude": [
+    "node_modules"
   ]
 }