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🌈 Tkoa is a Koa web app framework written in typescript.
Although written in typescript, you can still use the nodejs framework and koa middleware.
Not only that, you can also enjoy the type checking and convenient testing with typescript!
TKoa requires >= typescript v3.1.0 and node v7.6.0 for ES2015 and async function support.
$ npm install tkoa
import tKoa = require('tkoa');
interface ctx {
res: {
end: Function
}
}
const app = new tKoa();
// response
app.use((ctx: ctx) => {
ctx.res.end('Hello T-koa!');
});
app.listen(3000);
Tkoa is a middleware framework that can take two different kinds of functions as middleware:
Here is an example of logger middleware with each of the different functions:
interface ctx {
method: string,
url: string
}
app.use(async (ctx: ctx, next: Function) => {
const start = Date.now();
await next();
const ms = Date.now() - start;
console.log(`${ctx.method} ${ctx.url} - ${ms}ms`);
});
// Middleware normally takes two parameters (ctx, next), ctx is the context for one request,
// next is a function that is invoked to execute the downstream middleware. It returns a Promise with a then function for running code after completion.
interface ctx {
method: string,
url: string
}
app.use((ctx: ctx, next: Function) => {
const start = Date.now();
return next().then(() => {
const ms = Date.now() - start;
console.log(`${ctx.method} ${ctx.url} - ${ms}ms`);
});
});
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