compile typescript code to es6 instead of es5

Question

Currently learning typescript and I noticed that the output code is always using var. Is it possible to output const and let in the .js file or typescript needs to always output es5 for some reason? Thanks.

EXAMPLE:

// main.ts
const x: number = 2;
let y: string = 'hello';

// main.js
var x = 2;
var y = 'hello';

Is this output possible, if so, how?

// main.js
const x = 2;
let y = 'hello';

What's your tsconfig? Also, no, because all types are removed at compile time. — Phix
– Phix, Commented Jun 23, 2021 at 19:14
That second example isn't JavaScript and it's identical to the original code. — JLRishe
– JLRishe, Commented Jun 23, 2021 at 19:15
type annotations (: number, : string) are features of TypeScript, not ES6 — Samathingamajig
– Samathingamajig, Commented Jun 23, 2021 at 19:15

iMrFelix · Accepted Answer · 2021-06-23 19:16:03Z

1

You can add compiler flags to specify a target, e.g. --target es6. See this question: How do I transpile TypeScript to ES6?

answered Jun 23, 2021 at 19:16

iMrFelix

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chygo · Accepted Answer · 2023-05-08 06:50:54Z

0

In my case, after adding tsconfig.js and set

{
  "compilerOptions": {
    "target": "es2015"
  }
}

still not working.

Then I run npx tsc instead of npx tsc xxx.ts, then I get 'const'

answered May 8, 2023 at 6:50

chygo

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