prettier Show test2.js Source code

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var a: { foo?: string } = {};
a.foo = undefined; // This is not an error
a.foo = null; // But this is an error
 
var b: { foo?: ?string } = {};
b.foo = undefined; // This is fine
b.foo = null; // Also fine
 
var c: { foo?: string } = { foo: undefined }; // This is not an error
var d: { foo?: string } = { foo: null }; // But this is an error
 
var e: { foo?: ?string } = { foo: undefined }; // This is fine
var f: { foo?: ?string } = { foo: null }; // Also fine
 

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