require-extension.js
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/**
* @fileoverview Restrict file extensions that may be required
* @author Scott Andrews
*/
'use strict';
var path = require('path');
// ------------------------------------------------------------------------------
// Constants
// ------------------------------------------------------------------------------
var DEFAULTS = {
extentions: ['.jsx']
};
var PKG_REGEX = /^[^\.]((?!\/).)*$/;
// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------
module.exports = function(context) {
function isPackage(id) {
return PKG_REGEX.test(id);
}
function isRequire(expression) {
return expression.callee.name === 'require';
}
function getId(expression) {
return expression.arguments[0] && expression.arguments[0].value;
}
function getExtension(id) {
return path.extname(id || '');
}
function getExtentionsConfig() {
return context.options[0] && context.options[0].extensions || DEFAULTS.extentions;
}
var forbiddenExtensions = getExtentionsConfig().reduce(function (extensions, extension) {
extensions[extension] = true;
return extensions;
}, Object.create(null));
function isForbiddenExtension(ext) {
return ext in forbiddenExtensions;
}
// --------------------------------------------------------------------------
// Public
// --------------------------------------------------------------------------
return {
CallExpression: function(node) {
if (isRequire(node)) {
var id = getId(node);
var ext = getExtension(id);
if (!isPackage(id) && isForbiddenExtension(ext)) {
context.report(node, 'Unable to require module with extension \'' + ext + '\'');
}
}
}
};
};
module.exports.schema = [{
type: 'object',
properties: {
extensions: {
type: 'array',
items: {
type: 'string'
}
}
},
additionalProperties: false
}];