error TS5053: Option 'allowJs' cannot be specified with option 'declaration'.
tests/cases/compiler/a.ts(2,1): error TS2448: Block-scoped variable 'a' used before its declaration.
!!! error TS5053: Option 'allowJs' cannot be specified with option 'declaration'.
==== tests/cases/compiler/a.ts (1 errors) ====
let b = 30;
a = 10;
~
!!! error TS2448: Block-scoped variable 'a' used before its declaration.
!!! related TS2728 tests/cases/compiler/b.js:1:5: 'a' is declared here.
==== tests/cases/compiler/b.js (0 errors) ====
let a = 10;
b = 30;
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