Suggestion: non-nullable type · Issue #185 · microsoft/TypeScript (original) (raw)

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Description

Introduce two new syntax for type declaration based on JSDoc

var myString: !string = 'hello world'; //non-nullable var myString1: ?string = 'hello world'; // nullable var myString2: string = 'hello world'; // nullable var myString3 = 'hello world'; // nullable

by default type are nullable.

Two new compiler flag :

• inferNonNullableType make the compiler infer non-nullable type :

var myString3 = 'hello world' // typeof myString is '!string', non-nullable

• nonNullableTypeByDefault (I guess there might be a better name) :

var myString: !string = 'hello world'; // non-nullable var myString1: string = 'hello world'; // non-nullable var myString2: ?string = 'hello world'; // nullable var myString3 = 'hello world' // non-nullable