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sourcemaps's Introduction

SourceMaps

.NET Standard 2.0 library for parsing and using SourceMaps

Packages

SourceMaps NuGet Version

SourceMaps library that handles parsing of the sourcemap and has methods for getting the original position, name and file for a generated position.

SourceMaps.StackTraces NuGet Version

SourceMaps.StackTraces is an additional package that can be used to parse JavaScript stack traces and map them with the source map to the original files.

Usage

SourceMaps

To parse a sourcemap

using SourceMaps;

var sourceMap = SourceMapParser.Parse(sourceMapAsString);

To get the original mapping for a given generated position, use

var mapping = sourceMap.OriginalPositionFor(generatedLineNumber: 1, generatedColumnNumber: 1);

mapping.OriginalName; // original token name
mapping.OriginalFileName; // original file name
mapping.OriginalSourcePosition.LineNumber; // original line number
mapping.OriginalSourcePosition.ColumnNumber; // original column number

SourceMaps.StackTraces

To get the original stack trace using the source maps

StackTraceParser.ReTrace(
    sourceMap,
    stackTrace: @"ReferenceError: ""getExceptionProps"" is undefined
    at eval code (eval code:1:1)
    at foo (http://path/to/file.js:58:17)
    at bar (http://path/to/file.js:109:1)",
    sourceRoot: "https://localhost:5001/js/");

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sourcemaps's Issues

Incorrect source map parsing?

Hi,

I'm trying to trace a stacktrace for a script that has been created by webpack. The stacktrace comes from server side rendering this using ReactJS.NET and "V8JsEngine".

The original stacktrace looks like

at useFilterQs (hbd-ssr.1d6f13df.js:283:9)
    at ProductList (hbd-ssr.1d6f13df.js:4774:79)
    at processChild (hbd-ssr.1d6f13df.js:56618:14)
    at resolve (hbd-ssr.1d6f13df.js:56535:5)
    at render (hbd-ssr.1d6f13df.js:57010:22)
    at read (hbd-ssr.1d6f13df.js:56948:29)
    at renderToString (hbd-ssr.1d6f13df.js:57563:27)
    at Script [3]:1:16

Using this library I get:

test at Error (webpack:///../src/UI/hbd-ui/src/base/hooks/use-filter-qs.ts:14:11)
 at webpack:///../src/UI/hbd-ui/src/components/products/list/index.tsx:79:25
 at webpack:///../node_modules/react-dom/cjs/react-dom-server.browser.development.js:3042:1
 at webpack:///../node_modules/react-dom/cjs/react-dom-server.browser.development.js:2959:1
 at webpack:///../node_modules/react-dom/cjs/react-dom-server.browser.development.js:3434:1
 at webpack:///../node_modules/react-dom/cjs/react-dom-server.browser.development.js:3372:1
 at webpack:///../node_modules/react-dom/cjs/react-dom-server.browser.development.js:3987:1
 at Script ([3]:1:16)

If I instead of rendering this on the server let the client render I get the following stacktrace:

Uncaught Error: test
    at useFilterQs (use-filter-qs.ts:14)
    at ProductList (index.tsx:79)
    at renderWithHooks (react-dom.development.js:14803)
    at mountIndeterminateComponent (react-dom.development.js:17482)
    at beginWork (react-dom.development.js:18596)
    at HTMLUnknownElement.callCallback (react-dom.development.js:188)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:237)
    at invokeGuardedCallback (react-dom.development.js:292)
    at beginWork$1 (react-dom.development.js:23203)
    at performUnitOfWork (react-dom.development.js:22154)

It seems like I'm loosing the function names? I tried validating this using tools like stacktracify (https://github.com/mifi/stacktracify). This tools gives me the same result as you library. This lead me to that maybe its a webpack problem. But it seems like the browser is able to parse the source map correclty. Is is it just doing something else to make it work?

I can see that the Frame has the correct method names but it get overriden by the OriginalName property from the SourceMapMappingEntry. Is this correct?

{SourceMaps.SourceMapMappingEntry}
    GeneratedColumnNumber: 74
    GeneratedLineNumber: 88920
    OriginalColumnNumber: 31
    OriginalFileName: "webpack:///../src/UI/hbd-ui/src/base/hooks/use-filter-qs.ts"
    OriginalLineNumber: 13
    OriginalName: "location"

{SourceMaps.SourceMapMappingEntry}
    GeneratedColumnNumber: 85
    GeneratedLineNumber: 93715
    OriginalColumnNumber: 24
    OriginalFileName: "webpack:///../src/UI/hbd-ui/src/components/products/list/index.tsx"
    OriginalLineNumber: 78
    OriginalName: null

frame.File = originalPosition?.OriginalFileName;
frame.Method = originalPosition?.OriginalName;
frame.LineNumber = originalPosition?.OriginalLineNumber + 1;
frame.ColumnNumber = originalPosition?.OriginalColumnNumber + 1;

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