Kevin Powell - Community•14mo ago

TypeScript behavior

I'm doing some simple JavaScript coding exercises in TS and have come across this odd behavior I haven't encountered before. I have only the following code:

const inputs: Array<Array<any>> = [
  [1, 2, 4, 0],
  [1, 2, [4, 0]],
  [[[2, 3, 4, 5]]],
];

const inputs: Array<Array<any>> = [
  [1, 2, 4, 0],
  [1, 2, [4, 0]],
  [[[2, 3, 4, 5]]],
];

I get the following error:

Cannot redeclare block-scoped variable 'inputs'.ts(2451)
const inputs: any[][]

Cannot redeclare block-scoped variable 'inputs'.ts(2451)
const inputs: any[][]

Did a really quick Google search, and it seems to be because it's in the global scope. So I put it in a function and it works. Now, when I try this code only and by itself:

const x: String = "Hello";

const x: String = "Hello";

I get no such error. Why is that?

2 Replies

Joao•14mo ago

Sometimes the TS server gets hung up, try to restart it

vince•14mo ago

It was a linter error, but I actually didn't try running it lol, let me check now It runs in ts-node lol Ohhh I see, it's because my vscode linter is somehow tied to my workspace (folder) rather than each file, so because I declared it in another file inside my workspace, it's throwing a warning. That's weird Thanks!

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TypeScript behavior