ce4c83ff
 wxy
初始提交
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.visitor = void 0;
function _core() {
const data = require("@babel/core");
_core = function () {
return data;
};
return data;
}
function getTDZStatus(refPath, bindingPath) {
const executionStatus = bindingPath._guessExecutionStatusRelativeTo(refPath);
if (executionStatus === "before") {
return "inside";
} else if (executionStatus === "after") {
return "outside";
} else {
return "maybe";
}
}
function buildTDZAssert(node, state) {
return _core().types.callExpression(state.addHelper("temporalRef"), [node, _core().types.stringLiteral(node.name)]);
}
function isReference(node, scope, state) {
const declared = state.letReferences[node.name];
if (!declared) return false;
return scope.getBindingIdentifier(node.name) === declared;
}
const visitor = {
ReferencedIdentifier(path, state) {
if (!state.tdzEnabled) return;
const {
node,
parent,
scope
} = path;
if (path.parentPath.isFor({
left: node
})) return;
if (!isReference(node, scope, state)) return;
const bindingPath = scope.getBinding(node.name).path;
if (bindingPath.isFunctionDeclaration()) return;
const status = getTDZStatus(path, bindingPath);
if (status === "inside") return;
if (status === "maybe") {
const assert = buildTDZAssert(node, state);
bindingPath.parent._tdzThis = true;
path.skip();
if (path.parentPath.isUpdateExpression()) {
if (parent._ignoreBlockScopingTDZ) return;
path.parentPath.replaceWith(_core().types.sequenceExpression([assert, parent]));
} else {
path.replaceWith(assert);
}
} else if (status === "outside") {
path.replaceWith(_core().types.throwStatement(_core().types.inherits(_core().types.newExpression(_core().types.identifier("ReferenceError"), [_core().types.stringLiteral(`${node.name} is not defined - temporal dead zone`)]), node)));
}
},
AssignmentExpression: {
exit(path, state) {
if (!state.tdzEnabled) return;
const {
node
} = path;
if (node._ignoreBlockScopingTDZ) return;
const nodes = [];
const ids = path.getBindingIdentifiers();
for (const name in ids) {
const id = ids[name];
if (isReference(id, path.scope, state)) {
nodes.push(buildTDZAssert(id, state));
}
}
if (nodes.length) {
node._ignoreBlockScopingTDZ = true;
nodes.push(node);
path.replaceWithMultiple(nodes.map(_core().types.expressionStatement));
}
}
}
};
exports.visitor = visitor;
|
