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Bugzilla Report Package Product: Developer Tools Component: General / Debugger Title: [Source Map Loader] Worker crash due to unhandled JSON.parse error on non-JSON/HTML … (read more)
Bugzilla Report Package
Product: Developer Tools
Component: General / Debugger
Title: [Source Map Loader] Worker crash due to unhandled JSON.parse error on non-JSON/HTML responses in fetchSourceMap.js
Description:
When fetching source maps in a worker context, fetchSourceMap.js occasionally encounters an unexpected non-JSON response (such as an HTML error page or 404 response starting with ). This causes an unhandled JSON.parse exception at line 83 (_fetch), crashing the source map consumer.
Stack Trace: Plaintext
Source map error: Error: JSON.parse: unexpected character at line 1 column 1 of the JSON data Stack in the worker: parseSourceMapInput@resource://devtools/client/shared/vendor/source-map/lib/util.js:163:15 _factory@resource://devtools/client/shared/vendor/source-map/lib/source-map-consumer.js:1069:22 SourceMapConsumer@resource://devtools/client/shared/vendor/source-map/lib/source-map-consumer.js:26:12 _fetch@resource://devtools/client/shared/source-map-loader/utils/fetchSourceMap.js:83:19
Proposed Patch (fetchSourceMap.js - Line 83): JavaScript
// Replace direct unhandled parse at line 83 with safe parsing: const sourceMap = (() => {
try {
const trimmed = responseText ? responseText.trim() : "";
if (trimmed.startsWith("<") || trimmed.startsWith("
})();