53 lines
1.2 KiB
JavaScript
53 lines
1.2 KiB
JavaScript
/**
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* Copyright 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @emails react-core
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*/
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'use strict';
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module.exports = function(context) {
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function report(node, name, msg) {
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context.report(node, `Do not use the ${name} constructor. ${msg}`);
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}
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function check(node) {
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const name = node.callee.name;
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switch (name) {
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case 'Boolean':
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report(
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node,
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name,
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'To cast a value to a boolean, use double negation: !!value'
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);
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break;
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case 'String':
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report(
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node,
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name,
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'To cast a value to a string, concat it with the empty string ' +
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'(unless it\'s a symbol, which has different semantics): ' +
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'\'\' + value'
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);
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break;
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case 'Number':
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report(
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node,
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name,
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'To cast a value to a number, use the plus operator: +value'
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);
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break;
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}
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}
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return {
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CallExpression: check,
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NewExpression: check,
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};
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};
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