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error TS5055: Cannot write file 'tests/cases/compiler/a.js' because it would overwrite input file.
Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
tests/cases/compiler/a.js(2,8): error TS8009: The '?' modifier can only be used in TypeScript files.
tests/cases/compiler/a.js(4,8): error TS8009: The '?' modifier can only be used in TypeScript files.
!!! error TS5055: Cannot write file 'tests/cases/compiler/a.js' because it would overwrite input file.
!!! error TS5055: Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
==== tests/cases/compiler/a.js (2 errors) ====
class C {
foo?() {
~
!!! error TS8009: The '?' modifier can only be used in TypeScript files.
}
bar? = 1;
~
!!! error TS8009: The '?' modifier can only be used in TypeScript files.
}
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