kitchensink
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Dispatch's awesome components and style guide
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JavaScript
/**
* Requires capitalized constructors to to use the `new` keyword
*
* Types: `Boolean` or `Object`
*
* Values: `true` or Object with `allExcept` Array of quoted identifiers which are exempted
*
* JSHint: [`newcap`](http://jshint.com/docs/options/#newcap)
*
* #### Example
*
* ```js
* "requireCapitalizedConstructorsNew": true
* "requireCapitalizedConstructorsNew": {
* "allExcept": ["SomethingNative"]
* }
* ```
*
* ##### Valid
*
* ```js
* var a = new B();
* var c = SomethingNative();
* ```
*
* ##### Invalid
*
* ```js
* var d = E();
* ```
*/
var assert = require('assert');
module.exports = function() {};
module.exports.prototype = {
configure: function(options) {
assert(
options === true || Array.isArray(options.allExcept),
this.getOptionName() + ' option requires a true value or an object of exceptions'
);
this._allowedConstructors = {};
var allExcept = options.allExcept;
if (allExcept) {
for (var i = 0, l = allExcept.length; i < l; i++) {
this._allowedConstructors[allExcept[i]] = true;
}
}
},
getOptionName: function() {
return 'requireCapitalizedConstructorsNew';
},
check: function(file, errors) {
var allowedConstructors = this._allowedConstructors;
file.iterateNodesByType('CallExpression', function(node) {
if (node.callee.type === 'Identifier' &&
!allowedConstructors[node.callee.name] &&
node.callee.name[0].toLowerCase() !== node.callee.name[0]
) {
errors.add(
'Constructor functions should use the "new" keyword',
node.callee.loc.start.line,
node.callee.loc.start.column
);
}
});
}
};