test-repo/changelog_unreleased/api/17860.md

Allow AstPath#call() to access property of nullish properties (#17860 by @fisker)

Previously, to check for a possible non-existent child node, we had to ensure the node existed first.

const isFoo = path.call(() => path.node?.type === "Foo", "foo", "bar");
// Uncaught TypeError: Cannot read properties of undefined (reading 'bar')

We have to

const isFoo =
  path.node.foo?.bar &&
  path.call(() => path.node?.type === "Foo", "foo", "bar");

Since Prettier main, accessing a property of nullish properties no longer throws errors.