The tc39 pattern matching proposal seems to have some renewed energy with new champions (including from the typescript team) and syntax proposals:

https://github.com/tc39/proposal-pattern-matching

Also there has been movement in the user land space with libraries like ts-pattern that make use of new features in typescript 4.x to provide basically the full pattern matching experience:

https://github.com/gvergnaud/ts-pattern

It helps that is has good smart-casting, you can do with an if where other languages need pattern matching

    const x: { t: 'A', foo: string } | { t: 'B', bar: string } = /*...*/
    return x.t === 'A' ? x.foo : x.bar

It is cool syntax trick, but it won’t make compiler tell you when you missed a case