fix: duck type error checking (#6924)

* fix: duck type error checking

* fix: use duck-typing

* simplify

* fix typings

* fix comments

src/tracing/errors.test.ts

@@ -79,7 +79,7 @@ describe('beforeSend', () => {
   describe('filters browser extension errors', () => {
     it('filters chrome-extension errors', () => {
       const originalException = new Error()
-      originalException.stack = ` 
+      originalException.stack = `
         TypeError: Cannot create proxy with a non-object as target or handler
           at pa(chrome-extension://kbjhmlgclljgdhmhffjofbobmficicjp/proxy-window-evm.a5430696.js:22:216604)
           at da(chrome-extension://kbjhmlgclljgdhmhffjofbobmficicjp/proxy-window-evm.a5430696.js:22:212968)
@@ -90,13 +90,25 @@ describe('beforeSend', () => {
 
     it('filters moz-extension errors', () => {
       const originalException = new Error()
-      originalException.stack = ` 
+      originalException.stack = `
         Error: Permission denied to access property "apply"
           at WINDOW.onunhandledrejection(../node_modules/@sentry/src/instrument.ts:610:1)
           at y/h.onunhandledrejection(moz-extension://95cafb7b-6038-4bdd-b832-d3a58544601d/content_script/inpage_sol.js:143:16274)
       `
       expect(beforeSend(ERROR, { originalException })).toBeNull()
     })
+
+    it('filters non-Error objects thrown from an extension', () => {
+      const originalException = {
+        message: '',
+        stack: `
+        Error: Permission denied to access property "apply"
+          at WINDOW.onunhandledrejection(../node_modules/@sentry/src/instrument.ts:610:1)
+          at y/h.onunhandledrejection(moz-extension://95cafb7b-6038-4bdd-b832-d3a58544601d/content_script/inpage_sol.js:143:16274)
+      `,
+      }
+      expect(beforeSend(ERROR, { originalException })).toBeNull()
+    })
   })
 
   describe('OneKey', () => {

src/tracing/errors.ts

@@ -23,9 +23,14 @@ export const beforeSend: Required<ClientOptions>['beforeSend'] = (event: ErrorEv
   return event
 }
 
+type ErrorLike = Partial<Error> & Required<Pick<Error, 'message'>>
+function isErrorLike(error: unknown): error is ErrorLike {
+  return error instanceof Object && 'message' in error && typeof (error as Partial<ErrorLike>)?.message === 'string'
+}
+
 /** Identifies ethers request errors (as thrown by {@type import(@ethersproject/web).fetchJson}). */
-function isEthersRequestError(error: Error): error is Error & { requestBody: string } {
+function isEthersRequestErrorLike(error: ErrorLike): error is ErrorLike & { requestBody: string } {
-  return 'requestBody' in error && typeof (error as unknown as Record<'requestBody', unknown>).requestBody === 'string'
+  return 'requestBody' in error && typeof (error as Record<'requestBody', unknown>).requestBody === 'string'
 }
 
 // Since the interface currently uses HashRouter, URLs will have a # before the path.
@@ -44,11 +49,12 @@ function updateRequestUrl(event: ErrorEvent) {
 
 // TODO(WEB-2400): Refactor to use a config instead of returning true for each condition.
 function shouldRejectError(error: EventHint['originalException']) {
-  if (error instanceof Error) {
+  // Some libraries throw ErrorLike objects ({ code, message, stack }) instead of true Errors.
-    // ethers aggressively polls for block number, and it sometimes fails (whether spuriously or through rate-limiting).
+  if (isErrorLike(error)) {
-    // If block number polling, it should not be considered an exception.
+    if (isEthersRequestErrorLike(error)) {
-    if (isEthersRequestError(error)) {
       const method = JSON.parse(error.requestBody).method
+      // ethers aggressively polls for block number, and it sometimes fails (whether spuriously or through rate-limiting).
+      // If block number polling, it should not be considered an exception.
       if (method === 'eth_blockNumber') return true
     }
 
@@ -64,14 +70,6 @@ function shouldRejectError(error: EventHint['originalException']) {
     // Therefore, this can be ignored.
     if (error.message.match(/Unexpected token '<'/)) return true
 
-    // Errors coming from a browser extension can be ignored. These errors are usually caused by extensions injecting
-    // scripts into the page, which we cannot control.
-    if (error.stack?.match(/-extension:\/\//i)) return true
-
-    // Errors coming from OneKey (a desktop wallet) can be ignored for now.
-    // These errors are either application-specific, or they will be thrown separately outside of OneKey.
-    if (error.stack?.match(/OneKey/i)) return true
-
     // Content security policy 'unsafe-eval' errors can be filtered out because there are expected failures.
     // For example, if a user runs an eval statement in console this error would still get thrown.
     // TODO(WEB-2348): We should extend this to filter out any type of CSP error.
@@ -92,8 +90,18 @@ function shouldRejectError(error: EventHint['originalException']) {
       return true
     }
 
+    if ('stack' in error && typeof error.stack === 'string') {
+      // Errors coming from a browser extension can be ignored. These errors are usually caused by extensions injecting
+      // scripts into the page, which we cannot control.
+      if (error.stack.match(/-extension:\/\//i)) return true
+
+      // Errors coming from OneKey (a desktop wallet) can be ignored for now.
+      // These errors are either application-specific, or they will be thrown separately outside of OneKey.
+      if (error.stack.match(/OneKey/i)) return true
+    }
+
     // These are caused by user navigation away from the page before a request has finished.
-    if (error instanceof DOMException && error.name === 'AbortError') return true
+    if (error instanceof DOMException && error?.name === 'AbortError') return true
   }
 
   return false