Parser error with bigint literal object keys and class properties

[almeidx]

Bug Report

The TypeScript compiler does not support BigInt literal properties on objects/classes (without square brackets)

🔎 Search Terms

bigint literal object key class property

🕗 Version & Regression Information

• This is a crash
• This is the behavior in every version I tried (all the versions available in the TypeScript playground)

⏯ Playground Link

Playground link with relevant code

💻 Code

const obj = { 1n: 123 };

class A {
    1n = 123;
}

🙁 Actual behavior

Various parser errors:

• The left-hand side of an assignment expression must be a variable or a property access.
• Property assignment expected.
• ';' expected.
• Declaration or statement expected.
• Unexpected token. A constructor, method, accessor, or property was expected.
• Declaration or statement expected.

🙂 Expected behavior

Anything but a parser error

[MartinJohns]

Is there any legit reason why you would write code like this?

[MartinJohns]

Duplicate of #35982.

[fatcerberus]

It’s interesting that #35982 says this wasn’t implemented on purpose, since it’s legal JS syntax.