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Wasp is a declarative language that recognizes web application-specific terms (e.g. page or route) as words (types) of the language.

The basic idea is that the higher-level overview of an app (e.g. pages, routes, database model, ...) is defined in *.wasp files (for now just one), while the specific parts (web components, back-end queries, ...) are implemented in specific non-wasp technologies (React, NodeJS, Prisma) and then referenced in the *.wasp files.

Basic structure of a Wasp project is:

  • *.wasp file
  • ext/ directory -> Contains non-wasp code (JS, CSS, ...) structured in any way you want.

When referencing code from ext/ in your *.wasp file, you do it as @ext/relative/path/of/file/in/ext/dir.

Simple example

TodoApp/  - main.wasp  - ext/    - operations.js    - pages/      - Main.js
app todoApp {  title: "ToDo App"}
route RootRoute { path: "/", to: MainPage }page MainPage {  component: import Main from "@ext/pages/Main"}
query getTasks {  fn: import { getTasks } from "@ext/operations.js",  entities: [Task]}
action createTask {  fn: import { createTask } from "@ext/operations.js",  entities: [Task]}
entity Task {=psl  id          Int     @id @default(autoincrement())  description String  isDone      Boolean @default(false)psl=}

You can check out a full working example here.

In the following sections each of the basic language features is explained.