Error 2488 only shown once

Bug Report

When the error Type '{type}[] | undefined' must have a '[Symbol.iterator]()' method that returns an iterator.(2488) occurs multiple times in a project it only shows once.

As could be seen in the image above only data_1 has red underline, while I expect to also have red underline by data_2.

🕗 Version & Regression Information

When using es5 or older both errors are shown, but from es6 only one error shows.

⏯ Playground Link

Playground link with example

💻 Code

// using math.random to create type string[] or undefined
const data: string[] | undefined = Math.random() ? [] : undefined;

const data_1 = [...data]; // has a error shown
const data_2 = [...data]; // has no error shown

🙁 Actual behavior

The TypeScript compiler is only returning one of the multiple errors when the error is of type 2488.

🙂 Expected behavior

The TypeScript compiler should return all the locations of the errors, even if they are the same type. This would be handy for code analysis tools.

[danny12321]

Even when ignoring the first error the second will still not show. This makes compiling with compile errors (that are not showing) possible.

But when creating a copy both errors show which is interesting.

[nicojs]

Thanks for the response @RyanCavanaugh 🙏.

Also without the @ts-expect-error family of problems here, tools/users might rely on full error reporting. I believe that is also a design goal.

We at StrykerJS rely on a full error report in order to validate multiple mutants at the same time in https://github.com/stryker-mutator/stryker-js/pull/3900.