unwind-js
v1.0.0
Published
This really just wraps up [Mozilla's 'source map'](https://github.com/mozilla/source-map) package into a command line interface.
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unwind-js
This really just wraps up Mozilla's 'source map' package into a command line interface.
Command line usage
# Install globally.
npm install -g unwind-js
# Map file rebasing.
unwind-js -map ./path/to/index.js.map index.js:1:23456
# => file: MyComponent.tsx
# => line: 101
# => column: 32
# Manifest file.
unwind-js -manifest ./path/to/manifest.json vendors.js:1:23456
API usage
This package also provides an RpcError
model for moving errors over a JSON API.
Given a payload:
{
"name": "Error",
"message": "I broke",
"frames": [
{
"lineNumber": 2,
"columnNumber": 12345,
"fileName": "0.ab8a8bc44.js",
"functionName": "Yc"
},
{
"fileName": "[native code]",
"functionName": "parse",
"isNative": true
},
...
]
}
Use the RpcError
class to parse and rebase.
import { RpcError } from 'unwind-js/RpcError';
app.post("/errors", async (req, res, next) => {
try {
// Parse the body, will throw errors for invalid payloads.
const error = RpcError.parse(req.body);
// Rebase into the original maps.
// Will throw if no frames could be rebased.
await error.rebase();
// Prints the stack trace in V8 format.
// https://v8.dev/docs/stack-trace-api
console.log(error.format());
}
catch (error) {
next(error);
}
});
Or use the the rebase()
function to interactively rebase frames.
import { URLSearchParams } from 'url';
import { rebase } from 'unwind-js';
app.get("/errors/:filename", async (req, res, next) => {
// Parse request.
const query = new URLSearchParams(req.query);
const filename = req.params.filename;
const line = query.get("line");
const column = query.get("column");
// Rebase. Returns a 'MappedPosition' object.
const original = await rebase(filename, line, column);
// Print.
res.send(`
filename: ${original.name}
column: ${original.column}
line: ${original.line}
`);
});
TODO
- Add a client-side interface for parsing native errors and forming the
RpcError
payload.- requires 'error-stack-parser'
- Rename to 'whirlwind' ?