[api-minor] Update the minimum supported Node.js version to 18

This patch updates the minimum supported environments as follows:
 - Node.js 18, which was released on 2022-04-19; see https://en.wikipedia.org/wiki/Node.js#Releases

Note also that Node.js 16 will soon reach EOL, and thus no longer receive any security updates.

gulpfile.js

@@ -80,7 +80,7 @@ const ENV_TARGETS = [
   "Chrome >= 88",
   "Firefox ESR",
   "Safari >= 14.1",
-  "Node >= 16",
+  "Node >= 18",
   "> 1%",
   "not IE > 0",
   "not dead",
@@ -2168,7 +2168,6 @@ function packageJson() {
     },
     dependencies: {
       "path2d-polyfill": "^2.0.1",
-      "web-streams-polyfill": "^3.2.1",
     },
     browser: {
       canvas: false,
@@ -2184,7 +2183,7 @@ function packageJson() {
       url: DIST_REPO_URL,
     },
     engines: {
-      node: ">=16",
+      node: ">=18",
     },
   };
 

package.json

@@ -55,7 +55,6 @@
     "typogr": "^0.6.8",
     "vinyl": "^3.0.0",
     "vinyl-fs": "^3.0.3",
-    "web-streams-polyfill": "^3.2.1",
     "webpack": "^5.80.0",
     "webpack-stream": "^7.0.0",
     "wintersmith": "^2.5.0",
@@ -69,7 +68,7 @@
     "url": "git://github.com/mozilla/pdf.js.git"
   },
   "engines": {
-    "node": ">=16"
+    "node": ">=18"
   },
   "license": "Apache-2.0"
 }

src/core/worker.js

@@ -133,14 +133,10 @@ class WorkerMessageHandler {
       // Ensure that (primarily) Node.js users won't accidentally attempt to use
       // a non-translated/non-polyfilled build of the library, since that would
       // quickly fail anyway because of missing functionality.
-      if (
-        (isNodeJS && typeof Path2D === "undefined") ||
-        typeof ReadableStream === "undefined"
-      ) {
+      if (isNodeJS && typeof Path2D === "undefined") {
         const partialMsg =
           "The browser/environment lacks native support for critical " +
-          "functionality used by the PDF.js library " +
-          "(e.g. `Path2D` and/or `ReadableStream`); ";
+          "functionality used by the PDF.js library (e.g. `Path2D`); ";
 
         if (isNodeJS) {
           throw new Error(partialMsg + "please use a `legacy`-build instead.");

src/shared/compatibility.js

@@ -36,33 +36,23 @@ import { isNodeJS } from "./is_node.js";
   polyfillPath2D(globalThis);
 })();
 
-// Support: Node.js<18.0.0
-(function checkReadableStream() {
-  if (globalThis.ReadableStream || !isNodeJS) {
-    return;
-  }
-  globalThis.ReadableStream = __non_webpack_require__(
-    "web-streams-polyfill/dist/ponyfill.js"
-  ).ReadableStream;
-})();
-
-// Support: Firefox<90, Chrome<92, Safari<15.4, Node.js<16.6.0
+// Support: Chrome<92, Safari<15.4
 (function checkArrayAt() {
   if (Array.prototype.at) {
     return;
   }
   require("core-js/es/array/at.js");
 })();
 
-// Support: Firefox<90, Chrome<92, Safari<15.4, Node.js<16.6.0
+// Support: Chrome<92, Safari<15.4
 (function checkTypedArrayAt() {
   if (Uint8Array.prototype.at) {
     return;
   }
   require("core-js/es/typed-array/at.js");
 })();
 
-// Support: Firefox<94, Chrome<98, Safari<15.4, Node.js<17.0.0
+// Support: Chrome<98, Safari<15.4
 (function checkStructuredClone() {
   if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
     // The current image decoders are synchronous, hence `structuredClone`