8f85593910
## Summary Assert unreachable was created through advice given by both the Typescript community and through the techniques that TyepScript is trying to achieve type safety with switch statements. This fixes recent bugs by: * Re-adding the never type * Reduces the two different types by putting the helper within the common section so there's not duplication * Fixes on type that looks like it was a regular string rather than a one of the enum types The reasoning for exhaustive checks within switch statements and techniques can be seen in numerous areas such as here: https://stackoverflow.com/questions/39419170/how-do-i-check-that-a-switch-block-is-exhaustive-in-typescript You can do it either way with TypeScript as long as you ensure you have a explicit return type and you do early return statements you can actually avoid having to call into the assertUnreachable. If introduced and used correctly it is there to help out like this error it is telling us that this string type is not exhaustive: <img width="921" alt="Screen Shot 2020-08-24 at 10 39 42 AM" src="https://user-images.githubusercontent.com/1151048/91075618-9b1ad380-e5fb-11ea-9200-1c355faf5dca.png"> You can notice that for this pull request I actually remove the assertion like so if someone accidentally removes one of the switch statements: <img width="1014" alt="Screen Shot 2020-08-24 at 10 42 08 AM" src="https://user-images.githubusercontent.com/1151048/91075662-a968ef80-e5fb-11ea-8d74-a92eedd63892.png"> And since the function has an explicit return type it is not needed. You will see that TypeScript improved its never types behind the scenes where it actually will tell you that it will never reach the `assertUnreachable` and want to remove it as an auto-refactor. That is ok as long as we have explicit return types and what I did with one line of code here. <img width="536" alt="Screen Shot 2020-08-24 at 11 21 05 AM" src="https://user-images.githubusercontent.com/1151048/91075861-efbe4e80-e5fb-11ea-9991-dda111a04f1d.png"> Without this fix, and having the never type become an unknown it introduces less safety where any code that is utilizing the assertUnknown without explicit return types will be prone to having run time errors being thrown when something new is added to their switch enum types. |
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Kibana
Kibana is your window into the Elastic Stack. Specifically, it's a browser-based analytics and search dashboard for Elasticsearch.
- Getting Started
- Documentation
- Version Compatibility with Elasticsearch
- Questions? Problems? Suggestions?
Getting Started
If you just want to try Kibana out, check out the Elastic Stack Getting Started Page to give it a whirl.
If you're interested in diving a bit deeper and getting a taste of Kibana's capabilities, head over to the Kibana Getting Started Page.
Using a Kibana Release
If you want to use a Kibana release in production, give it a test run, or just play around:
- Download the latest version on the Kibana Download Page.
- Learn more about Kibana's features and capabilities on the Kibana Product Page.
- We also offer a hosted version of Kibana on our Cloud Service.
Building and Running Kibana, and/or Contributing Code
You might want to build Kibana locally to contribute some code, test out the latest features, or try out an open PR:
- CONTRIBUTING.md will help you get Kibana up and running.
- If you would like to contribute code, please follow our STYLEGUIDE.md.
- For all other questions, check out the FAQ.md and wiki.
Documentation
Visit Elastic.co for the full Kibana documentation.
For information about building the documentation, see the README in elastic/docs.
Version Compatibility with Elasticsearch
Ideally, you should be running Elasticsearch and Kibana with matching version numbers. If your Elasticsearch has an older version number or a newer major number than Kibana, then Kibana will fail to run. If Elasticsearch has a newer minor or patch number than Kibana, then the Kibana Server will log a warning.
Note: The version numbers below are only examples, meant to illustrate the relationships between different types of version numbers.
| Situation | Example Kibana version | Example ES version | Outcome |
|---|---|---|---|
| Versions are the same. | 5.1.2 | 5.1.2 | 💚 OK |
| ES patch number is newer. | 5.1.2 | 5.1.5 | ⚠️ Logged warning |
| ES minor number is newer. | 5.1.2 | 5.5.0 | ⚠️ Logged warning |
| ES major number is newer. | 5.1.2 | 6.0.0 | 🚫 Fatal error |
| ES patch number is older. | 5.1.2 | 5.1.0 | ⚠️ Logged warning |
| ES minor number is older. | 5.1.2 | 5.0.0 | 🚫 Fatal error |
| ES major number is older. | 5.1.2 | 4.0.0 | 🚫 Fatal error |
Questions? Problems? Suggestions?
- If you've found a bug or want to request a feature, please create a GitHub Issue. Please check to make sure someone else hasn't already created an issue for the same topic.
- Need help using Kibana? Ask away on our Kibana Discuss Forum and a fellow community member or Elastic engineer will be glad to help you out.