The Single-Valued Type Pattern for TypeScript
We’ve been using TypeScript heavily over the last few years at Atomic, and a pattern has emerged for how we deal with cases where we want flexible, composable APIs for dealing with statically-known concerns about an application. Our Wish List Whether it’s data repositories, CMS content types, GraphQL queries, or background jobs, situations regularly arise where you need to design a solution to a p
HTML Snapshot Testing with Node
It’s been almost a year since my posts on Excel workbook snapshot testing and PDF snapshot testing. Both of these have proven to be very valuable in our automated test suite and have allowed us to easily catch regressions, manually inspect the differences, and then update as needed. Another task on my current project has allowed me to revisit this approach—this time for snapshot testing of the HTM
Type-Safe Object Merging (TypeScript 2.8 Edition)
There are times when you want to merge two generic types in TypeScript, and type inference just isn’t doing it for you. Object.assign’s typing isn’t as precise as it could be, and spreading generics still doesn’t work. I’ve found a way to implement typing when merging objects using some of the new features in TypeScript 2.8. A Sample Problem Let’s start by defining some types we can use as example
A New Redux Action Pattern for TypeScript 2.4+
In September 2016, I wrote a post about a pattern for strongly typed Redux reducers in TypeScript. Since then, the TypeScript team has been busy enhancing the language, and recent changes in TypeScript have enabled a much more natural, boilerplate-free pattern for strongly typed actions and reducers in TypeScript. Our motivating example is to be able to write reducers like this: This reducer is fo
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