dsebastien

const p1 = new Promise<Promise<Number>>((resolveOuter) => {
    const innerPromise = new Promise<Number>((resolveInner) => {
        console.log('Resolving inner promise')
        resolveInner(1)
    })

    console.log('Resolving outer promise')
    resolveOuter(innerPromise)
})

dsebastien

// constraints
exists type Foo extends { hello: string };

// type parameters
exists type Foo<T>;

// both!
exists type Foo<T, U> extends { toString(): string };

dsebastien

exists type Foo extends {
    hello: string
};

// works!
type Foo = {
    hello: string;
    world: number;
};

dsebastien

exists type Bar extends {
    hello: string;
}

// error!
type Bar = {
    hello: number; // <- wrong implementation of 'hello'
    world: number;
}

dsebastien

const nestedPromise = new Promise(
  (r1) => r1(new Promise(
    (r2) => r2(new Promise(
      (r3) => r3(42)
    )))));

nestedPromise.then((x) => console.log(x)); //prints 42
console.log(await nestedPromise); //prints 42

dsebastien

try {
  throw 42;
} catch (err: unknown) { // Error: TS1196: Catch clause variable cannot have a type annotation
  console.error("oops");
}

dsebastien

$ echo "Hello world" > hello.txt

dsebastien@trankillux MINGW64 /c/Users/dsebastien/wks/tmp (master)
$ cat hello.txt
Hello world

dsebastien@trankillux MINGW64 /c/Users/dsebastien/wks/tmp (master)
$ ls
total 21K
drwxr-xr-x 1 dsebastien 197121  0 May 19 10:05 .

dsebastien

$ git status
On branch master

No commits yet

Untracked files:
        hello.txt

nothing added to commit but untracked files present

dsebastien

$ git status
On branch master

No commits yet

Changes to be committed:
        new file:   hello.txt

dsebastien

$ echo "I am a Git newcomer" > hello.txt
$ git status
On branch master

No commits yet

Changes to be committed:
        new file:   hello.txt

Changes not staged for commit: