Annotating Types

Annotating declarations and casts

Introduction

The compiler recognizes @type annotations in two contexts: declarations and casts.

Details

Function declarations

{{{ /** @type {function():string} */ function f() {return 'str'} }}}

Variable declarations

{{{ /** @type {string} */ var x = 'fruit'; }}}

or

var /** @type {string} */ x = 'fruit';

Property declarations

/** @type {string} */
x.prop = 'fruit';

or

var x = {
  /** @type {string} */
  prop : 'fruit'
};

Catch declarations

{{{ try { ... } catch (/** @type {string} */ e) { ... } }}}

Type Casts

Type cast precede a parenthesized expression.

var x = /** @type {string} */ (fruit);