New rule: no top level import in .d.ts files

[kaytwo]

Description

more info: https://stackoverflow.com/a/51114250/12887845

using a top level import in a .d.ts file breaks the entire file because of how TypeScript handles ambient vs. normal modules, and tsc is no help debugging it, it just loses access to the defined types.

A rule that implements "warn on top level import in filename matching /\.d\.ts$/" would suffice.

[ematipico]

Thank you @kaytwo for the issue.

I don't know if you intend to contribute by opening a PR, but if you don't, can you please provide more information for whoever wants to contribute?

For example:

• name of the rule
• potential group (for the future)
• reference to other eslint rules that do the same
• examples of code that violates the rule
• examples of code that passes the rule
• some text to explain the error (must adhere the rule pillars https://biomejs.dev/linter/#rule-pillars)

Failing to provide such information would make the issue stale, and we will have to close it.