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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
=== tests/cases/compiler/reactDefaultPropsInferenceSuccess.tsx ===
/// <reference path="react16.d.ts" />
import React from 'react';
>React : typeof React
interface BaseProps {
when?: ((value: string) => boolean) | "a" | "b";
>when : "a" | "b" | ((value: string) => boolean) | undefined
>value : string
error?: boolean;
>error : boolean | undefined
}
interface Props extends BaseProps {
}
class FieldFeedback<P extends Props = BaseProps> extends React.Component<P> {
>FieldFeedback : FieldFeedback<P>
>React.Component : React.Component<P, {}, any>
>React : typeof React
>Component : typeof React.Component
static defaultProps = {
>defaultProps : { when: () => boolean; }
>{ when: () => true } : { when: () => boolean; }
when: () => true
>when : () => boolean
>() => true : () => boolean
>true : true
};
render() {
>render : () => JSX.Element
return <div>Hello</div>;
><div>Hello</div> : JSX.Element
>div : any
>div : any
}
}
// OK
const Test1 = () => <FieldFeedback when={value => !!value} />;
>Test1 : () => JSX.Element
>() => <FieldFeedback when={value => !!value} /> : () => JSX.Element
><FieldFeedback when={value => !!value} /> : JSX.Element
>FieldFeedback : typeof FieldFeedback
>when : (value: string) => boolean
>value => !!value : (value: string) => boolean
>value : string
>!!value : boolean
>!value : boolean
>value : string
// Error: Void not assignable to boolean
const Test2 = () => <FieldFeedback when={value => console.log(value)} />;
>Test2 : () => JSX.Element
>() => <FieldFeedback when={value => console.log(value)} /> : () => JSX.Element
><FieldFeedback when={value => console.log(value)} /> : JSX.Element
>FieldFeedback : typeof FieldFeedback
>when : (value: string) => void
>value => console.log(value) : (value: string) => void
>value : string
>console.log(value) : void
>console.log : (...data: any[]) => void
>console : Console
>log : (...data: any[]) => void
>value : string
class FieldFeedbackBeta<P extends Props = BaseProps> extends React.Component<P> {
>FieldFeedbackBeta : FieldFeedbackBeta<P>
>React.Component : React.Component<P, {}, any>
>React : typeof React
>Component : typeof React.Component
static defaultProps: BaseProps = {
>defaultProps : BaseProps
>{ when: () => true } : { when: () => true; }
when: () => true
>when : () => true
>() => true : () => true
>true : true
};
render() {
>render : () => JSX.Element
return <div>Hello</div>;
><div>Hello</div> : JSX.Element
>div : any
>div : any
}
}
// OK
const Test1a = () => <FieldFeedbackBeta when={value => !!value} error>Hah</FieldFeedbackBeta>;
>Test1a : () => JSX.Element
>() => <FieldFeedbackBeta when={value => !!value} error>Hah</FieldFeedbackBeta> : () => JSX.Element
><FieldFeedbackBeta when={value => !!value} error>Hah</FieldFeedbackBeta> : JSX.Element
>FieldFeedbackBeta : typeof FieldFeedbackBeta
>when : (value: string) => boolean
>value => !!value : (value: string) => boolean
>value : string
>!!value : boolean
>!value : boolean
>value : string
>error : true
>FieldFeedbackBeta : typeof FieldFeedbackBeta
// Error: Void not assignable to boolean
const Test2a = () => <FieldFeedbackBeta when={value => console.log(value)} error>Hah</FieldFeedbackBeta>;
>Test2a : () => JSX.Element
>() => <FieldFeedbackBeta when={value => console.log(value)} error>Hah</FieldFeedbackBeta> : () => JSX.Element
><FieldFeedbackBeta when={value => console.log(value)} error>Hah</FieldFeedbackBeta> : JSX.Element
>FieldFeedbackBeta : typeof FieldFeedbackBeta
>when : (value: string) => void
>value => console.log(value) : (value: string) => void
>value : string
>console.log(value) : void
>console.log : (...data: any[]) => void
>console : Console
>log : (...data: any[]) => void
>value : string
>error : true
>FieldFeedbackBeta : typeof FieldFeedbackBeta
interface MyPropsProps extends Props {
when: (value: string) => boolean;
>when : (value: string) => boolean
>value : string
}
class FieldFeedback2<P extends MyPropsProps = MyPropsProps> extends FieldFeedback<P> {
>FieldFeedback2 : FieldFeedback2<P>
>FieldFeedback : FieldFeedback<P>
static defaultProps = {
>defaultProps : { when: () => boolean; }
>{ when: () => true } : { when: () => boolean; }
when: () => true
>when : () => boolean
>() => true : () => boolean
>true : true
};
render() {
>render : () => JSX.Element
this.props.when("now"); // OK, always defined
>this.props.when("now") : boolean
>this.props.when : P["when"]
>this.props : Readonly<{ children?: React.ReactNode; }> & Readonly<P>
>this : this
>props : Readonly<{ children?: React.ReactNode; }> & Readonly<P>
>when : P["when"]
>"now" : "now"
return <div>Hello</div>;
><div>Hello</div> : JSX.Element
>div : any
>div : any
}
}
// OK
const Test3 = () => <FieldFeedback2 when={value => !!value} />;
>Test3 : () => JSX.Element
>() => <FieldFeedback2 when={value => !!value} /> : () => JSX.Element
><FieldFeedback2 when={value => !!value} /> : JSX.Element
>FieldFeedback2 : typeof FieldFeedback2
>when : (value: string) => boolean
>value => !!value : (value: string) => boolean
>value : string
>!!value : boolean
>!value : boolean
>value : string
// Error: Void not assignable to boolean
const Test4 = () => <FieldFeedback2 when={value => console.log(value)} />;
>Test4 : () => JSX.Element
>() => <FieldFeedback2 when={value => console.log(value)} /> : () => JSX.Element
><FieldFeedback2 when={value => console.log(value)} /> : JSX.Element
>FieldFeedback2 : typeof FieldFeedback2
>when : (value: string) => void
>value => console.log(value) : (value: string) => void
>value : string
>console.log(value) : void
>console.log : (...data: any[]) => void
>console : Console
>log : (...data: any[]) => void
>value : string
// OK
const Test5 = () => <FieldFeedback2 />;
>Test5 : () => JSX.Element
>() => <FieldFeedback2 /> : () => JSX.Element
><FieldFeedback2 /> : JSX.Element
>FieldFeedback2 : typeof FieldFeedback2
|
