1 | const { parseSync, traverse } = require('@babel/core');
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2 | const { defaults } = require('@istanbuljs/schema');
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3 | const { MAGIC_KEY, MAGIC_VALUE } = require('./constants');
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4 |
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5 | function getAst(code) {
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6 | if (typeof code === 'object' && typeof code.type === 'string') {
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7 |
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8 | return code;
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9 | }
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10 |
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11 | if (typeof code !== 'string') {
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12 | throw new Error('Code must be a string');
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13 | }
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14 |
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15 |
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16 | return parseSync(code, {
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17 | babelrc: false,
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18 | configFile: false,
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19 | parserOpts: {
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20 | allowAwaitOutsideFunction: true,
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21 | allowImportExportEverywhere: true,
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22 | allowReturnOutsideFunction: true,
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23 | allowSuperOutsideMethod: true,
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24 | sourceType: 'script',
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25 | plugins: defaults.instrumenter.parserPlugins
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26 | }
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27 | });
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28 | }
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29 |
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30 | module.exports = function readInitialCoverage(code) {
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31 | const ast = getAst(code);
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32 |
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33 | let covScope;
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34 | traverse(ast, {
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35 | ObjectProperty(path) {
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36 | const { node } = path;
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37 | if (
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38 | !node.computed &&
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39 | path.get('key').isIdentifier() &&
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40 | node.key.name === MAGIC_KEY
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41 | ) {
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42 | const magicValue = path.get('value').evaluate();
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43 | if (!magicValue.confident || magicValue.value !== MAGIC_VALUE) {
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44 | return;
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45 | }
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46 | covScope =
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47 | path.scope.getFunctionParent() ||
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48 | path.scope.getProgramParent();
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49 | path.stop();
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50 | }
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51 | }
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52 | });
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53 |
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54 | if (!covScope) {
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55 | return null;
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56 | }
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57 |
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58 | const result = {};
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59 |
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60 | for (const key of ['path', 'hash', 'gcv', 'coverageData']) {
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61 | const binding = covScope.getOwnBinding(key);
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62 | if (!binding) {
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63 | return null;
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64 | }
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65 | const valuePath = binding.path.get('init');
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66 | const value = valuePath.evaluate();
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67 | if (!value.confident) {
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68 | return null;
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69 | }
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70 | result[key] = value.value;
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71 | }
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72 |
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73 | delete result.coverageData[MAGIC_KEY];
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74 | delete result.coverageData.hash;
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75 |
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76 | return result;
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77 | };
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