fix: add Promise.try polyfill (closes #51)

johannschopplich · johannschopplich · commit 47776f605836 · 2026-04-28T06:51:06.000+02:00
diff --git a/src/pdfjs-serverless/polyfills.mjs b/src/pdfjs-serverless/polyfills.mjs
@@ -10,6 +10,14 @@ if (typeof Promise.withResolvers === 'undefined') {
   }
 }
 
+// `Promise.try` is used by PDF.js v5.6+ in its message handler.
+// Not yet available in Safari < 18.2 and Node.js < 23.
+if (typeof Promise.try === 'undefined') {
+  Promise.try = function (fn, ...args) {
+    return new Promise(resolve => resolve(fn(...args)))
+  }
+}
+
 // `Map.prototype.getOrInsertComputed` is used extensively by PDF.js v5.6+.
 // Not yet available in most runtimes.
 if (typeof Map.prototype.getOrInsertComputed === 'undefined') {

Original file line number	Diff line number	Diff line change
`@@ -10,6 +10,14 @@ if (typeof Promise.withResolvers === 'undefined') {`
`10`	`10`	`}`
`11`	`11`	`}`
`12`	`12`
	`13`	+// `Promise.try` is used by PDF.js v5.6+ in its message handler.
	`14`	`+// Not yet available in Safari < 18.2 and Node.js < 23.`
	`15`	`+if (typeof Promise.try === 'undefined') {`
	`16`	`+ Promise.try = function (fn, ...args) {`
	`17`	`+ return new Promise(resolve => resolve(fn(...args)))`
	`18`	`+ }`
	`19`	`+}`
	`20`	`+`
`13`	`21`	// `Map.prototype.getOrInsertComputed` is used extensively by PDF.js v5.6+.
`14`	`22`	`// Not yet available in most runtimes.`
`15`	`23`	`if (typeof Map.prototype.getOrInsertComputed === 'undefined') {`