TypeScript Training Overview
This Introduction to TypeScript training course teaches attendees the fundamentals of the TypeScript language. Discover the powerful and expressive type system that TypeScript provides as well as TypeScript tooling (including the type checker, editor plugins, compiler, and more).
Location and Pricing
Accelebrate offers instructor-led enterprise training for groups of 3 or more online or at your site. Most Accelebrate classes can be flexibly scheduled for your group, including delivery in half-day segments across a week or set of weeks. To receive a customized proposal and price quote for private corporate training on-site or online, please contact us.
In addition, some courses are available as live, instructor-led training from one of our partners.
Objectives
- Write and deploy type-safe server and client-side applications using TypeScript
- Interface with existing TypeScript libraries
- Use TypeScript’s powerful type system to improve existing JavaScript code and increase type safety
- Understand warnings and errors reported by the TypeScript compiler/type-checker (tsc) and take action to resolve them
- Go beyond basic type annotations, instead learning to represent real-world application state in a type-safe way
Prerequisites
- Proficiency/experience in at least one modern object-oriented programming language, preferably a statically-typed language (e.g., C# or Java)
- Previous experience with JavaScript either as a frontend web developer or backend Node.js developer
Outline
Expand All | Collapse All
Introduction
Basic Types and Variable Declarations
Primitives and Non-Primitives
Typing Function Arguments and Return Types
Basic Type Inference
Generics and Type Parameters
Any
Unions
More Advanced Generics
Any vs. Unknown
Type Guards and Narrowing
Interfaces vs. Type Aliases
Intersection Types
Modules and Exporting Type Aliases
Ways to Break Type Guarantees
- any
- foo as Bar
- Function or Object or object in certain cases
- Non-null assertion operator foo!.bar
Using as to tell TypeScript “trust me”
Discriminated unions (tagged unions)
Creating Custom Type Guards
Literal Types
Enums and Const Enums
Building a Validator using Custom Type Guards
Using Runtypes or Zod to Validate Data
Declaration Files and DefinitelyTyped Repository of Community Types
Recursive Types
Typing JSON
Utility Types
Generics with Constraints
Advanced Types (typeof, keyof)
Making a Property Read-only
Conditional Types
Making a Type or Interface Read-Only (the hard way)
Runtime Manifestation (type position vs. value position)
Mapped Types (using a key in to modify an object type or interface)
ReadonlyArray (and the read-only modifier for object properties)
Declaration Merging
Adding Types to Existing Code
Declaration Files
- Shipped with the package from the library author
- Decl Files written by the community
- Write your own and put it in global.d.ts
- If it is your own library, then you can add JSDoc annotations, then you don’t need a d.ts file
- If you have a JS file with JSDoc annotations then you can auto-generate the d.ts for export (such as if you’re a library author)
Conclusion
Training Materials
All TypeScript training attendees receive comprehensive courseware.
Software Requirements
- Google Chrome and/or Firefox
- Other modern browsers as desired
- IDE/development environment of your choice
- Other free software and lab files that Accelebrate would specify
