File: instanceofWithStructurallyIdenticalTypes.js

package info (click to toggle)
node-typescript 3.3.3333-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 324,548 kB
  • sloc: makefile: 6; sh: 3
file content (180 lines) | stat: -rw-r--r-- 3,793 bytes parent folder | download
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
//// [instanceofWithStructurallyIdenticalTypes.ts]
// Repro from #7271

class C1 { item: string }
class C2 { item: string[] }
class C3 { item: string }

function foo1(x: C1 | C2 | C3): string {
    if (x instanceof C1) {
        return x.item;
    }
    else if (x instanceof C2) {
        return x.item[0];
    }
    else if (x instanceof C3) {
        return x.item;
    }
    return "error";
}

function isC1(c: C1 | C2 | C3): c is C1 { return c instanceof C1 }
function isC2(c: C1 | C2 | C3): c is C2 { return c instanceof C2 }
function isC3(c: C1 | C2 | C3): c is C3 { return c instanceof C3 }

function foo2(x: C1 | C2 | C3): string {
    if (isC1(x)) {
        return x.item;
    }
    else if (isC2(x)) {
        return x.item[0];
    }
    else if (isC3(x)) {
        return x.item;
    }
    return "error";
}

// More tests

class A { a: string }
class A1 extends A { }
class A2 { a: string }
class B extends A { b: string }

function goo(x: A) {
    if (x instanceof A) {
        x;  // A
    }
    else {
        x;  // never
    }
    if (x instanceof A1) {
        x;  // A1
    }
    else {
        x;  // A
    }
    if (x instanceof A2) {
        x;  // A2
    }
    else {
        x;  // A
    }
    if (x instanceof B) {
        x;  // B
    }
    else {
        x;  // A
    }
}


//// [instanceofWithStructurallyIdenticalTypes.js]
// Repro from #7271
var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var C1 = /** @class */ (function () {
    function C1() {
    }
    return C1;
}());
var C2 = /** @class */ (function () {
    function C2() {
    }
    return C2;
}());
var C3 = /** @class */ (function () {
    function C3() {
    }
    return C3;
}());
function foo1(x) {
    if (x instanceof C1) {
        return x.item;
    }
    else if (x instanceof C2) {
        return x.item[0];
    }
    else if (x instanceof C3) {
        return x.item;
    }
    return "error";
}
function isC1(c) { return c instanceof C1; }
function isC2(c) { return c instanceof C2; }
function isC3(c) { return c instanceof C3; }
function foo2(x) {
    if (isC1(x)) {
        return x.item;
    }
    else if (isC2(x)) {
        return x.item[0];
    }
    else if (isC3(x)) {
        return x.item;
    }
    return "error";
}
// More tests
var A = /** @class */ (function () {
    function A() {
    }
    return A;
}());
var A1 = /** @class */ (function (_super) {
    __extends(A1, _super);
    function A1() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return A1;
}(A));
var A2 = /** @class */ (function () {
    function A2() {
    }
    return A2;
}());
var B = /** @class */ (function (_super) {
    __extends(B, _super);
    function B() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return B;
}(A));
function goo(x) {
    if (x instanceof A) {
        x; // A
    }
    else {
        x; // never
    }
    if (x instanceof A1) {
        x; // A1
    }
    else {
        x; // A
    }
    if (x instanceof A2) {
        x; // A2
    }
    else {
        x; // A
    }
    if (x instanceof B) {
        x; // B
    }
    else {
        x; // A
    }
}