setup-python/node_modules/babel-plugin-jest-hoist/build/index.js
Danny McCormick 39c08a0eaa Initial pass
2019-06-26 21:12:00 -04:00

209 lines
5.3 KiB
JavaScript

'use strict';
/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
*/
// Only used for types
// eslint-disable-next-line
// eslint-disable-next-line
const invariant = (condition, message) => {
if (!condition) {
throw new Error('babel-plugin-jest-hoist: ' + message);
}
}; // We allow `jest`, `expect`, `require`, all default Node.js globals and all
// ES2015 built-ins to be used inside of a `jest.mock` factory.
// We also allow variables prefixed with `mock` as an escape-hatch.
const WHITELISTED_IDENTIFIERS = new Set([
'Array',
'ArrayBuffer',
'Boolean',
'DataView',
'Date',
'Error',
'EvalError',
'Float32Array',
'Float64Array',
'Function',
'Generator',
'GeneratorFunction',
'Infinity',
'Int16Array',
'Int32Array',
'Int8Array',
'InternalError',
'Intl',
'JSON',
'Map',
'Math',
'NaN',
'Number',
'Object',
'Promise',
'Proxy',
'RangeError',
'ReferenceError',
'Reflect',
'RegExp',
'Set',
'String',
'Symbol',
'SyntaxError',
'TypeError',
'URIError',
'Uint16Array',
'Uint32Array',
'Uint8Array',
'Uint8ClampedArray',
'WeakMap',
'WeakSet',
'arguments',
'console',
'expect',
'isNaN',
'jest',
'parseFloat',
'parseInt',
'require',
'undefined'
]);
Object.keys(global).forEach(name => {
WHITELISTED_IDENTIFIERS.add(name);
});
const JEST_GLOBAL = {
name: 'jest'
}; // TODO: Should be Visitor<{ids: Set<NodePath<Identifier>>}>, but `ReferencedIdentifier` doesn't exist
const IDVisitor = {
ReferencedIdentifier(path) {
// @ts-ignore: passed as Visitor State
this.ids.add(path);
},
blacklist: ['TypeAnnotation', 'TSTypeAnnotation', 'TSTypeReference']
};
const FUNCTIONS = Object.create(null);
FUNCTIONS.mock = args => {
if (args.length === 1) {
return args[0].isStringLiteral() || args[0].isLiteral();
} else if (args.length === 2 || args.length === 3) {
const moduleFactory = args[1];
invariant(
moduleFactory.isFunction(),
'The second argument of `jest.mock` must be an inline function.'
);
const ids = new Set();
const parentScope = moduleFactory.parentPath.scope; // @ts-ignore: Same as above: ReferencedIdentifier doesn't exist
moduleFactory.traverse(IDVisitor, {
ids
});
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (
var _iterator = ids[Symbol.iterator](), _step;
!(_iteratorNormalCompletion = (_step = _iterator.next()).done);
_iteratorNormalCompletion = true
) {
const id = _step.value;
const name = id.node.name;
let found = false;
let scope = id.scope;
while (scope !== parentScope) {
if (scope.bindings[name]) {
found = true;
break;
}
scope = scope.parent;
}
if (!found) {
invariant(
(scope.hasGlobal(name) && WHITELISTED_IDENTIFIERS.has(name)) ||
/^mock/i.test(name) || // Allow istanbul's coverage variable to pass.
/^(?:__)?cov/.test(name),
'The module factory of `jest.mock()` is not allowed to ' +
'reference any out-of-scope variables.\n' +
'Invalid variable access: ' +
name +
'\n' +
'Whitelisted objects: ' +
Array.from(WHITELISTED_IDENTIFIERS).join(', ') +
'.\n' +
'Note: This is a precaution to guard against uninitialized mock ' +
'variables. If it is ensured that the mock is required lazily, ' +
'variable names prefixed with `mock` (case insensitive) are permitted.'
);
}
}
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator.return != null) {
_iterator.return();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
return true;
}
return false;
};
FUNCTIONS.unmock = args => args.length === 1 && args[0].isStringLiteral();
FUNCTIONS.deepUnmock = args => args.length === 1 && args[0].isStringLiteral();
FUNCTIONS.disableAutomock = FUNCTIONS.enableAutomock = args =>
args.length === 0;
module.exports = () => {
const shouldHoistExpression = expr => {
if (!expr.isCallExpression()) {
return false;
}
const callee = expr.get('callee');
const expressionArguments = expr.get('arguments'); // TODO: avoid type casts - the types can be arrays (is it possible to ignore that without casting?)
const object = callee.get('object');
const property = callee.get('property');
return (
property.isIdentifier() &&
FUNCTIONS[property.node.name] &&
(object.isIdentifier(JEST_GLOBAL) ||
(callee.isMemberExpression() && shouldHoistExpression(object))) &&
FUNCTIONS[property.node.name](expressionArguments)
);
};
const visitor = {
ExpressionStatement(path) {
if (shouldHoistExpression(path.get('expression'))) {
// @ts-ignore: private, magical property
path.node._blockHoist = Infinity;
}
}
};
return {
visitor
};
};