javascript - typescript 使用const 报Cannot redeclare block-scoped variable

Question

Two files in the same directory a.ts b.ts

a.ts:

const a=1;

b.ts:

const a=2;

The two files have no dependencies, I really can’t figure it out

Answer 1

Because there is no import or export in your two files, so he thinks that your two files are global... and will naturally prompt this

Answer 2

Because there is no closure in the file, each a is a global variable by default. You can use export to export a, then a becomes a variable in the closure.