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Fix some sentences and code style

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This commit is contained in:
Michal Vanko 2022-02-28 11:27:54 +01:00
parent 15466619f3
commit 82c1b966ba
2 changed files with 5 additions and 5 deletions
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6
_posts/blog/2022-02-28-semi-functional-error-handling.md
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@ -18,13 +18,13 @@ It will run on a server with a possibility of migrating into serverless when we
## API design ## API design
As it is not a classic web server application I had to come up with slightly different error handling as we are used to. I've been trying to find a semi-functional API with all the good practices described in my [guide on error handling](https://michalvanko.dev/blog/2020-12-09-guide-on-error-handling). The main goal is to not let users be presented with internal information about errors. We want to show user-friendly messages instead. As it is not a classic web server application I had to come up with slightly different error handling as we are used to. I've been trying to find a semi-functional API with all the good practices described in my [guide on error handling](https://michalvanko.dev/blog/2020-12-09-guide-on-error-handling). The main goal is to not let users be presented with internal information about errors. We want to show user-friendly messages instead.
I call the API semi-functional as **I didn't want to use monads** and go 100% functional. We use simple asynchronous functions to handle interactions. I call this API semi-functional as **I didn't want to use monads** and go 100% functional. We use simple asynchronous functions to handle interactions.
The goal is to handle errors that are expected. Unexpected errors should still be thrown and caught by an _"Error boundary"_ around the whole app that will handle and log the error. The goal is to handle errors that are expected. Unexpected errors should still be thrown and caught by an _"Error boundary"_ around the whole app that will handle and log the error.
## Error types ## Error types
Let's create 2 types of `Error`s that all the other `Error`s can be extended from. Let's create 2 types of `Error`s that all the other `Error`s can be extended from.
These will allow us to distinguish if the thrown `Error` might be presented to the user. We want to handle `InternalError`s in a differently. We might log them to the different logs or trigger alarms before we convert them to a different `PublishableError`. These will allow us to distinguish if the thrown `Error` should be presented to the user. We want to handle `InternalError`s differently. We might log them to different logs or trigger alarms before we convert them to a different `PublishableError`.
```typescript ```typescript
export class PublishableError extends Error { export class PublishableError extends Error {
@ -45,7 +45,7 @@ export class InternalError extends Error {
``` ```
Then, we can create multiple app-specific errors by extending from these two. Then, we can create multiple app-specific errors by extending from these two.
> We need to set `Object.setPrototypeOf(...)` as TypeScript [introduced a breaking change](https://github.com/Microsoft/TypeScript-wiki/blob/main/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work) that might cause the inheritance to now work properly. > We need to set `Object.setPrototypeOf(...)` as TypeScript [introduced a breaking change](https://github.com/Microsoft/TypeScript-wiki/blob/main/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work) that may cause the inheritance to now work properly.
## Handling errors ## Handling errors

4
src/lib/styles/global.css.ts
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@ -83,8 +83,8 @@ globalStyle('main pre, main pre[class*="language-"], main :not(pre) > code', {
backgroundColor: vars.color.codeBackground, backgroundColor: vars.color.codeBackground,
paddingTop: vars.space['1x'], paddingTop: vars.space['1x'],
paddingBottom: vars.space['1x'], paddingBottom: vars.space['1x'],
paddingLeft: vars.space['2x'], paddingLeft: vars.space['1x'],
paddingRight: vars.space['2x'], paddingRight: vars.space['1x'],
color: vars.color.code, color: vars.color.code,
lineHeight: vars.lineHeight['0x'], lineHeight: vars.lineHeight['0x'],
boxShadow: vars.boxShadow.codeBoxShadow, boxShadow: vars.boxShadow.codeBoxShadow,