The imported library defines a top-level function named 'loadLibrary' that is hidden by deferring this libraryDRT-W1389

The analyzer produces this diagnostic when a library that declares a function named loadLibrary is imported using a deferred import. A deferred import introduces an implicit function named loadLibrary. This function is used to load the contents of the deferred library, and the implicit function hides the explicit declaration in the deferred library.

For more information, check out Lazily loading a library.

Example

Given a file a.dart that defines a function named loadLibrary:

void loadLibrary(Library library) {}

class Library {}

The following code produces this diagnostic because the implicit declaration of a.loadLibrary is hiding the explicit declaration of loadLibrary in a.dart:

import 'a.dart' deferred as a;

void f() {
  a.Library();
}

Common fixes

If the imported library isn't required to be deferred, then remove the keyword deferred:

import 'a.dart' as a;

void f() {
  a.Library();
}

If the imported library is required to be deferred and you need to reference the imported function, then rename the function in the imported library:

void populateLibrary(Library library) {}

class Library {}

If the imported library is required to be deferred and you don't need to reference the imported function, then add a hide clause:

import 'a.dart' deferred as a hide loadLibrary;

void f() {
  a.Library();
}