1 | 'use strict';
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2 |
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3 | const { getDocsUrl, isDescribe, isFunction } = require('./util');
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4 |
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5 | const isAsync = node => node.async;
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6 |
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7 | const isString = node =>
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8 | (node.type === 'Literal' && typeof node.value === 'string') ||
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9 | node.type === 'TemplateLiteral';
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10 |
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11 | const hasParams = node => node.params.length > 0;
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12 |
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13 | const paramsLocation = params => {
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14 | const [first] = params;
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15 | const last = params[params.length - 1];
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16 | return {
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17 | start: {
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18 | line: first.loc.start.line,
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19 | column: first.loc.start.column,
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20 | },
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21 | end: {
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22 | line: last.loc.end.line,
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23 | column: last.loc.end.column,
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24 | },
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25 | };
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26 | };
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27 |
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28 | module.exports = {
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29 | meta: {
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30 | docs: {
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31 | url: getDocsUrl(__filename),
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32 | },
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33 | },
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34 | create(context) {
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35 | return {
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36 | CallExpression(node) {
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37 | if (isDescribe(node)) {
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38 | if (node.arguments.length === 0) {
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39 | return context.report({
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40 | message: 'Describe requires name and callback arguments',
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41 | loc: node.loc,
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42 | });
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43 | }
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44 |
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45 | const [name] = node.arguments;
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46 | const [, callbackFunction] = node.arguments;
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47 | if (!isString(name)) {
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48 | context.report({
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49 | message: 'First argument must be name',
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50 | loc: paramsLocation(node.arguments),
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51 | });
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52 | }
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53 | if (callbackFunction === undefined) {
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54 | return context.report({
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55 | message: 'Describe requires name and callback arguments',
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56 | loc: paramsLocation(node.arguments),
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57 | });
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58 | }
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59 | if (!isFunction(callbackFunction)) {
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60 | return context.report({
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61 | message: 'Second argument must be function',
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62 | loc: paramsLocation(node.arguments),
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63 | });
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64 | }
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65 | if (isAsync(callbackFunction)) {
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66 | context.report({
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67 | message: 'No async describe callback',
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68 | node: callbackFunction,
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69 | });
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70 | }
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71 | if (hasParams(callbackFunction)) {
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72 | context.report({
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73 | message: 'Unexpected argument(s) in describe callback',
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74 | loc: paramsLocation(callbackFunction.params),
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75 | });
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76 | }
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77 | if (callbackFunction.body.type === 'BlockStatement') {
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78 | callbackFunction.body.body.forEach(node => {
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79 | if (node.type === 'ReturnStatement') {
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80 | context.report({
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81 | message: 'Unexpected return statement in describe callback',
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82 | node,
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83 | });
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84 | }
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85 | });
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86 | }
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87 | }
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88 | },
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89 | };
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90 | },
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91 | };
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