37 replies

How do I build an API that lets me do `await t.a().b()` & `await t.a(); await t.b()`?

I want to build an API that lets me chain in two ways:

await t
  .a()
  .b()
  .c()
...
// or
const t = ...;
await t.a();
await t.b();
await t.c();
...

await t
  .a()
  .b()
  .c()
...
// or
const t = ...;
await t.a();
await t.b();
await t.c();
...

This is known as the builder pattern. Usually it's straightforward, but I'm not sure how to create one when promises are involved.

NOTE: This is the way https://testcafe.io/ 's api works. I'm trying to build a similar api. See How do I build an API that lets me do `await t.a().b()` & `await t.a(); await t.b()`? (links to a few messages down)

37 replies

I want to build an API that lets me chain in two ways:

await t
  .a()
  .b()
  .c()
...
// or
const t = ...;
await t.a();
await t.b();
await t.c();
...

await t
  .a()
  .b()
  .c()
...
// or
const t = ...;
await t.a();
await t.b();
await t.c();
...