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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = readInitialCoverage;
var _core = require("@babel/core");
var _schema = require("@istanbuljs/schema");
var _constants = require("./constants");
function getAst(code) {
if (typeof code === 'object' && typeof code.type === 'string') {
// Assume code is already a babel ast.
return code;
}
if (typeof code !== 'string') {
throw new Error('Code must be a string');
} // Parse as leniently as possible
return (0, _core.parseSync)(code, {
babelrc: false,
configFile: false,
parserOpts: {
allowImportExportEverywhere: true,
allowReturnOutsideFunction: true,
allowSuperOutsideMethod: true,
sourceType: 'script',
plugins: _schema.defaults.instrumenter.parserPlugins
}
});
}
function readInitialCoverage(code) {
const ast = getAst(code);
let covScope;
(0, _core.traverse)(ast, {
ObjectProperty(path) {
const {
node
} = path;
if (!node.computed && path.get('key').isIdentifier() && node.key.name === _constants.MAGIC_KEY) {
const magicValue = path.get('value').evaluate();
if (!magicValue.confident || magicValue.value !== _constants.MAGIC_VALUE) {
return;
}
covScope = path.scope.getFunctionParent() || path.scope.getProgramParent();
path.stop();
}
}
});
if (!covScope) {
return null;
}
const result = {};
for (const key of ['path', 'hash', 'gcv', 'coverageData']) {
const binding = covScope.getOwnBinding(key);
if (!binding) {
return null;
}
const valuePath = binding.path.get('init');
const value = valuePath.evaluate();
if (!value.confident) {
return null;
}
result[key] = value.value;
}
delete result.coverageData[_constants.MAGIC_KEY];
delete result.coverageData.hash;
return result;
}
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