forked from babel/babel
/
isReferenced.ts
182 lines (156 loc) 路 4.42 KB
/
isReferenced.ts
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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
import type * as t from "..";
/**
* Check if the input `node` is a reference to a bound variable.
*/
export default function isReferenced(
node: t.Node,
parent: t.Node,
grandparent?: t.Node,
): boolean {
switch (parent.type) {
// yes: PARENT[NODE]
// yes: NODE.child
// no: parent.NODE
case "MemberExpression":
case "OptionalMemberExpression":
if (parent.property === node) {
return !!parent.computed;
}
return parent.object === node;
case "JSXMemberExpression":
return parent.object === node;
// no: let NODE = init;
// yes: let id = NODE;
case "VariableDeclarator":
return parent.init === node;
// yes: () => NODE
// no: (NODE) => {}
case "ArrowFunctionExpression":
return parent.body === node;
// no: class { #NODE; }
// no: class { get #NODE() {} }
// no: class { #NODE() {} }
// no: class { fn() { return this.#NODE; } }
case "PrivateName":
return false;
// no: class { NODE() {} }
// yes: class { [NODE]() {} }
// no: class { foo(NODE) {} }
case "ClassMethod":
case "ClassPrivateMethod":
case "ObjectMethod":
if (parent.key === node) {
return !!parent.computed;
}
return false;
// yes: { [NODE]: "" }
// no: { NODE: "" }
// depends: { NODE }
// depends: { key: NODE }
case "ObjectProperty":
if (parent.key === node) {
return !!parent.computed;
}
if (parent.value === node) {
return !grandparent || grandparent.type !== "ObjectPattern";
}
return true;
// no: class { NODE = value; }
// yes: class { [NODE] = value; }
// yes: class { key = NODE; }
case "ClassProperty":
if (parent.key === node) {
return !!parent.computed;
}
return true;
case "ClassPrivateProperty":
if (parent.key === node) {
return false;
}
return true;
// no: class NODE {}
// yes: class Foo extends NODE {}
case "ClassDeclaration":
case "ClassExpression":
return parent.superClass === node;
// yes: left = NODE;
// no: NODE = right;
case "AssignmentExpression":
return parent.right === node;
// no: [NODE = foo] = [];
// yes: [foo = NODE] = [];
case "AssignmentPattern":
return parent.right === node;
// no: NODE: for (;;) {}
case "LabeledStatement":
return false;
// no: try {} catch (NODE) {}
case "CatchClause":
return false;
// no: function foo(...NODE) {}
case "RestElement":
return false;
case "BreakStatement":
case "ContinueStatement":
return false;
// no: function NODE() {}
// no: function foo(NODE) {}
case "FunctionDeclaration":
case "FunctionExpression":
return false;
// no: export NODE from "foo";
// no: export * as NODE from "foo";
case "ExportNamespaceSpecifier":
case "ExportDefaultSpecifier":
return false;
// no: export { foo as NODE };
// yes: export { NODE as foo };
// no: export { NODE as foo } from "foo";
case "ExportSpecifier":
// @ts-expect-error todo(flow->ts): Property 'source' does not exist on type 'AnyTypeAnnotation'.
if (grandparent?.source) {
return false;
}
return parent.local === node;
// no: import NODE from "foo";
// no: import * as NODE from "foo";
// no: import { NODE as foo } from "foo";
// no: import { foo as NODE } from "foo";
// no: import NODE from "bar";
case "ImportDefaultSpecifier":
case "ImportNamespaceSpecifier":
case "ImportSpecifier":
return false;
// no: import "foo" assert { NODE: "json" }
case "ImportAttribute":
return false;
// no: <div NODE="foo" />
case "JSXAttribute":
return false;
// no: [NODE] = [];
// no: ({ NODE }) = [];
case "ObjectPattern":
case "ArrayPattern":
return false;
// no: new.NODE
// no: NODE.target
case "MetaProperty":
return false;
// yes: type X = { somePropert: NODE }
// no: type X = { NODE: OtherType }
case "ObjectTypeProperty":
return parent.key !== node;
// yes: enum X { Foo = NODE }
// no: enum X { NODE }
case "TSEnumMember":
return parent.id !== node;
// yes: { [NODE]: value }
// no: { NODE: value }
case "TSPropertySignature":
if (parent.key === node) {
return !!parent.computed;
}
return true;
}
return true;
}