Blog Page 2
Forbidden Typescript: full/partial objects
When trying to be as type-safe as possible in Typescript, there are times when you may have to dynamically construct an object. You know as a programmer that all the keys will have values, but because you have to dynamically construct the values, the type system doesnāt know that the object is complete:
Reviewing Your Frontend Applications
Below are some notes Iāve taken from setting up new code repositories and onboarding new team members. Hopefully they can help improve your current documentation and notes to make onboarding a smooth process.
Forbidden Typescript: ensuring all of a type
When creating more complex systems, there are times where you will want to ensure that an array contains every value of a defined type. We have a union of primitive literal types to define the possible values a type can have:
Smart Contract Security
The crypto craze has died down, but if you are working on Smart Contracts or thinking about creating a new blockchain projects, security is a huge part of making sure the project is successful. Since Smart Contracts often interact with cryptocurrencies, blockchain assets, or other tokens, itās important to make sure the Smart Contract is secure and follows best practices.
Forbidden Typescript: Get Class Name
We donāt get a lot of information using typeof
in JavaScript or TypeScript. At most, it tells us whether a value is undefined
, number
, string
, or object
. If you want to get the class name using a function, you can use the following extended version of classOf
that is originally from āJavaScript: The Definitive Guideā:
Forbidden Typescript: Enumerating Properties
In āJavaScript: The Definitive Guideā, there are functions described in 6.5 Enumerating Properties that probably shouldnāt be used in production code because they modify their input parameters: extend
, merge
, restrict
, and subtract
.
Forbidden Typescript: Using Object.create to clone
In āJavascript: The Definitive Guideā there is an example that uses Object.inherit
to inherit the prototype change. JavaScript defines a method Object.create
that creates a new object using the given argument as the prototype of that object. Translating the examples from The Definitive Guide to Typescript, it looks like:
Data on the Wire
Back when Meteor was in vogue, they popularized the concept of āData on the wireā. This was the idea that the UI would be updated with changes from the dataset it is subscribed to.
Component Library Checklist
The following is a checklist I like to use to ensure I'm covering all the bases when building a component library. It's a work in progress, but I hope it can be useful to others.
Debugging slow tsc
I was working on a project and I noticed the tsc
check that we ran on pre-commit hooks had become dramatically slower. I was seeing near instant times to type check the entire project go to agonizingly slow minutes to check the project. I was able to narrow the range of commits to some change we made within a month window. Iām sure I could have narrowed it down by continuing to git bisect and re-running time npx tsc
, but it was much easier to just check out main and try out the following: