TS2349

Expression is not callable

This expression is not callable.

The compiler’s own words. Not translated — this is the string you pasted into a search box.

Parentheses are being used as a function call, but the expression has no call signature.

Reproduction

const value = 'text'

value()

The build asserts this emits exactly this code.

Why the compiler says this

Only function-like values carry call signatures. A string may have methods, but the string itself is data; adding `()` asks the runtime to execute it as code.

Fixes

const value = 'text'

const upper = value.toUpperCase()

Call the method that performs the intended operation.

02
```
const value = () => 'text'

const text = value()
```
If this was meant to be deferred work, store a function rather than its result.

Takeaway

Read the type named under the headline: it tells you which non-function value actually reached the call site.

Where to go next

Type aliases Try it in the Lab

Errors