1 | /**
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2 | * @fileoverview Rule to flag when re-assigning native objects
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3 | * @author Ilya Volodin
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4 | */
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5 |
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6 | ;
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7 |
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8 | //------------------------------------------------------------------------------
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9 | // Rule Definition
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10 | //------------------------------------------------------------------------------
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11 |
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12 | module.exports = function(context) {
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13 | var config = context.options[0];
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14 | var exceptions = (config && config.exceptions) || [];
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15 |
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16 | /**
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17 | * Reports write references.
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18 | * @param {Reference} reference - A reference to check.
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19 | * @param {int} index - The index of the reference in the references.
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20 | * @param {Reference[]} references - The array that the reference belongs to.
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21 | * @returns {void}
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22 | */
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23 | function checkReference(reference, index, references) {
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24 | var identifier = reference.identifier;
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25 |
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26 | if (reference.init === false &&
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27 | reference.isWrite() &&
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28 | // Destructuring assignments can have multiple default value,
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29 | // so possibly there are multiple writeable references for the same identifier.
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30 | (index === 0 || references[index - 1].identifier !== identifier)
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31 | ) {
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32 | context.report({
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33 | node: identifier,
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34 | message: "{{name}} is a read-only native object.",
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35 | data: identifier
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36 | });
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37 | }
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38 | }
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39 |
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40 | /**
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41 | * Reports write references if a given variable is readonly builtin.
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42 | * @param {Variable} variable - A variable to check.
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43 | * @returns {void}
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44 | */
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45 | function checkVariable(variable) {
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46 | if (variable.writeable === false && exceptions.indexOf(variable.name) === -1) {
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47 | variable.references.forEach(checkReference);
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48 | }
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49 | }
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50 |
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51 | return {
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52 | "Program": function() {
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53 | var globalScope = context.getScope();
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54 | globalScope.variables.forEach(checkVariable);
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55 | }
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56 | };
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57 | };
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58 |
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59 | module.exports.schema = [
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60 | {
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61 | "type": "object",
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62 | "properties": {
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63 | "exceptions": {
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64 | "type": "array",
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65 | "items": {"type": "string"},
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66 | "uniqueItems": true
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67 | }
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68 | },
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69 | "additionalProperties": false
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70 | }
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71 | ];
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