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5 |
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6 | "use strict";
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7 |
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8 |
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9 |
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10 |
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11 |
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12 | module.exports = {
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13 | meta: {
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14 | type: "suggestion",
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15 |
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16 | docs: {
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17 | description: "require `for-in` loops to include an `if` statement",
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18 | category: "Best Practices",
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19 | recommended: false,
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20 | url: "https://eslint.org/docs/rules/guard-for-in"
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21 | },
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22 |
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23 | schema: [],
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24 | messages: {
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25 | wrap: "The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype."
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26 | }
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27 | },
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28 |
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29 | create(context) {
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30 |
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31 | return {
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32 |
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33 | ForInStatement(node) {
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34 | const body = node.body;
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35 |
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36 |
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37 | if (body.type === "EmptyStatement") {
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38 | return;
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39 | }
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40 |
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41 |
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42 | if (body.type === "IfStatement") {
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43 | return;
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44 | }
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45 |
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46 |
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47 | if (body.type === "BlockStatement" && body.body.length === 0) {
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48 | return;
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49 | }
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50 |
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51 |
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52 | if (body.type === "BlockStatement" && body.body.length === 1 && body.body[0].type === "IfStatement") {
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53 | return;
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54 | }
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55 |
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56 |
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57 | if (body.type === "BlockStatement" && body.body.length >= 1 && body.body[0].type === "IfStatement") {
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58 | const i = body.body[0];
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59 |
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60 |
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61 | if (i.consequent.type === "ContinueStatement") {
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62 | return;
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63 | }
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64 |
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65 |
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66 | if (i.consequent.type === "BlockStatement" && i.consequent.body.length === 1 && i.consequent.body[0].type === "ContinueStatement") {
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67 | return;
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68 | }
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69 | }
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70 |
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71 | context.report({ node, messageId: "wrap" });
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72 | }
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73 | };
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74 |
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75 | }
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76 | };
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