Toggling isolatedModules in tsconfig.json while running the compiler in watch mode, doesn't re-emit const enums, unlike toggling preserveConstEnums, which does #63223
Description
🔎 Search Terms
isolatedModules enums not re-emitted on watch mode
🕗 Version & Regression Information
Tested on 6.0.1-rc and 6.0.0-dev.20260309
I didn't research if this is a regression or not. It may have always been like this but never reported.
⏯ Playground Link
No response
💻 Code
const enum TestEnum {
a = 1,
b = 3,
c = 5,
}
const x = TestEnum.b🙁 Actual behavior
Toggling isolatedModules doesn't change the emitted code when running tsc in watch mode. However, if the compilation is redone, it does re-emit correctly.
🙂 Expected behavior
Should modify the emitted code for const enums when the option is changed on watch mode, since it does change when re-compiling from scratch.
Additional information about the issue
For comparison, toggling preserveConstEnums in tsconfig.json does correctly modify the emitted code in watch mode.
Clarification: the issue occurs when preserveConstEnums is not defined at all in tsconfig.json, so the emit behavior for const enums is implicit from it.