unminify

unminifies JS stacktrace errors

• Command Line Interface (CLI)
• Google Cloud native Docker container (alpha)
• Other containers?

Install

Install the command line interface (cli). The executable is unminify.

npm install @unminify/cli -g

CLI Usage

$ unminify
unminify: restore a minified stacktrace using a source map

  Usage:
  unminify :source-map index.js.map :stacktrace stacktrace.txt

  Available options:
  - :source-map (required) path to source map file
  - :stacktrace (required) path to a file with the minified stacktrace

Example minified stacktrace:

cat stacktrace.txt
TypeError: Cannot read properties of null (reading 'g')
    at https://app.example.com/js/index.js:933:67
    at tg (https://app.example.com/js/index.js:813:394)
    at Function.bd.j (https://app.example.com/js/index.js:815:147)
    at Function.ri.gb (https://app.example.com/js/index.js:933:34)
    at https://app.example.com/js/index.js:3201:443
    at https://app.example.com/js/index.js:1785:34
    at i_ (https://app.example.com/js/index.js:1727:67)
    at p_ (https://app.example.com/js/index.js:1741:67)
    at o_ (https://app.example.com/js/index.js:1745:415)
    at b (https://app.example.com/js/index.js:1724:150)

Unminify:

unminify :source-map index.js.map :stacktrace stacktrace.txt
TypeError: Cannot read properties of null (reading 'g')
    at f (cljs/core.cljs:5265:37)
    at G__42694 (cljs/core.cljs:2527:20)
    at cljs.core.iter_reduce (cljs/core.cljs:2577:8)
    at cljs.core.reduce (cljs/core.cljs:5265:10)
    at page (example/app/core.cljs:55:49)
    at G__45346 (re_frame/subs.cljc:198:70)
    at f (reagent/ratom.cljs:44:5)
    at reagent.ratom/deref-capture (reagent/ratom.cljs:420:7)
    at _run (reagent/ratom.cljs:415:6)
    at reagent.impl.batching/ratom-flush (reagent/impl/batching.cljs:97:5)

---

GCP Container

A Docker container to ingest errors, unminify and write to Error Reporting. The GCP Docker container can be built with bb docker:build:gcp. You can then tag the image via docker image tag docker.io/xfthhxk/unminify-gcp:alpha gcr.io/${gcp-project}/unminify-gcp:alpha and then push docker push gcr.io${gcp-project}/unminify-gcp:alpha

docker run -it --rm -p 8080:8080 \
--env BUCKET=some-bucket \
--env FILENAME='path/to/source-maps/${version}.index.js.map' \
--env ERROR_ENDPOINT=/error \
--env CORS_ORIGINS='https://*.example.com$,https://*.example.io$' \
--env CORS_CREDENTIALS=true \
--env CORS_MAX_AGE=600 \
--env CORS_ALLOWED_HEADERS='Access-Control-Allow-Origin, Access-Control-Request-Method' \
xfthhxk/unminify:gcp-alpha

• Uses source maps from Cloud Storage
• Unminifies the error
• Writes to Error Reporting
• Use environment variables to configure

The FILENAME contains ${version} which is replaced with the version from the client to find the relevant source map. This means as part of your build, the source map must be copied to the bucket at the specified path.

Cloud Run is a good target for running the container.

• Client:
  • Sends request body as either JSON or EDN (Transit coming soon).
  • Includes stacktrace, version and service keys in body.

Built With

• nbb
• node
• express

Credits

• Michiel Borkent for making nbb and other amazing tools so that I can Clojure all the things. Much joy!
• mifi for stacktracify

License

This is free and unencumbered software released into the public domain.