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| 1 | +//// [thisTypeInObjectLiterals2.ts] |
| 2 | + |
| 3 | +// In methods of an object literal with no contextual type, 'this' has the type |
| 4 | +// of the object literal. |
| 5 | + |
| 6 | +let obj1 = { |
| 7 | + a: 1, |
| 8 | + f() { |
| 9 | + return this.a; |
| 10 | + }, |
| 11 | + b: "hello", |
| 12 | + c: { |
| 13 | + g() { |
| 14 | + this.g(); |
| 15 | + } |
| 16 | + }, |
| 17 | + get d() { |
| 18 | + return this.a; |
| 19 | + }, |
| 20 | + get e() { |
| 21 | + return this.b; |
| 22 | + }, |
| 23 | + set e(value) { |
| 24 | + this.b = value; |
| 25 | + } |
| 26 | +}; |
| 27 | + |
| 28 | +// In methods of an object literal with a contextual type, 'this' has the |
| 29 | +// contextual type. |
| 30 | + |
| 31 | +type Point = { |
| 32 | + x: number; |
| 33 | + y: number; |
| 34 | + moveBy(dx: number, dy: number): void; |
| 35 | +} |
| 36 | + |
| 37 | +let p1: Point = { |
| 38 | + x: 10, |
| 39 | + y: 20, |
| 40 | + moveBy(dx, dy) { |
| 41 | + this.x += dx; |
| 42 | + this.y += dy; |
| 43 | + } |
| 44 | +}; |
| 45 | + |
| 46 | +declare function f1(p: Point): void; |
| 47 | + |
| 48 | +f1({ |
| 49 | + x: 10, |
| 50 | + y: 20, |
| 51 | + moveBy(dx, dy) { |
| 52 | + this.x += dx; |
| 53 | + this.y += dy; |
| 54 | + } |
| 55 | +}); |
| 56 | + |
| 57 | +// In methods of an object literal with a contextual type that includes some |
| 58 | +// ThisType<T>, 'this' is of type T. |
| 59 | + |
| 60 | +type ObjectDescriptor<D, M> = { |
| 61 | + data?: D; |
| 62 | + methods?: M & ThisType<D & M>; // Type of 'this' in methods is D & M |
| 63 | +} |
| 64 | + |
| 65 | +declare function makeObject<D, M>(desc: ObjectDescriptor<D, M>): D & M; |
| 66 | + |
| 67 | +let x1 = makeObject({ |
| 68 | + data: { x: 0, y: 0 }, |
| 69 | + methods: { |
| 70 | + moveBy(dx: number, dy: number) { |
| 71 | + this.x += dx; // Strongly typed this |
| 72 | + this.y += dy; // Strongly typed this |
| 73 | + } |
| 74 | + } |
| 75 | +}); |
| 76 | + |
| 77 | +// In methods contained in an object literal with a contextual type that includes |
| 78 | +// some ThisType<T>, 'this' is of type T. |
| 79 | + |
| 80 | +type ObjectDescriptor2<D, M> = ThisType<D & M> & { |
| 81 | + data?: D; |
| 82 | + methods?: M; |
| 83 | +} |
| 84 | + |
| 85 | +declare function makeObject2<D, M>(desc: ObjectDescriptor<D, M>): D & M; |
| 86 | + |
| 87 | +let x2 = makeObject2({ |
| 88 | + data: { x: 0, y: 0 }, |
| 89 | + methods: { |
| 90 | + moveBy(dx: number, dy: number) { |
| 91 | + this.x += dx; // Strongly typed this |
| 92 | + this.y += dy; // Strongly typed this |
| 93 | + } |
| 94 | + } |
| 95 | +}); |
| 96 | + |
| 97 | +// Proof of concept for typing of Vue.js |
| 98 | + |
| 99 | +type Accessors<T> = { [K in keyof T]: (() => T[K]) | Computed<T[K]> }; |
| 100 | + |
| 101 | +type Dictionary<T> = { [x: string]: T } |
| 102 | + |
| 103 | +type Computed<T> = { |
| 104 | + get?(): T; |
| 105 | + set?(value: T): void; |
| 106 | +} |
| 107 | + |
| 108 | +type VueOptions<D, M, P> = ThisType<D & M & P> & { |
| 109 | + data?: D | (() => D); |
| 110 | + methods?: M; |
| 111 | + computed?: Accessors<P>; |
| 112 | +} |
| 113 | + |
| 114 | +declare const Vue: new <D, M, P>(options: VueOptions<D, M, P>) => D & M & P; |
| 115 | + |
| 116 | +let vue = new Vue({ |
| 117 | + data: () => ({ x: 1, y: 2 }), |
| 118 | + methods: { |
| 119 | + f(x: string) { |
| 120 | + return this.x; |
| 121 | + } |
| 122 | + }, |
| 123 | + computed: { |
| 124 | + test(): number { |
| 125 | + return this.x; |
| 126 | + }, |
| 127 | + hello: { |
| 128 | + get() { |
| 129 | + return "hi"; |
| 130 | + }, |
| 131 | + set(value: string) { |
| 132 | + } |
| 133 | + } |
| 134 | + } |
| 135 | +}); |
| 136 | + |
| 137 | +vue; |
| 138 | +vue.x; |
| 139 | +vue.f("abc"); |
| 140 | +vue.test; |
| 141 | +vue.hello; |
| 142 | + |
| 143 | + |
| 144 | +//// [thisTypeInObjectLiterals2.js] |
| 145 | +// In methods of an object literal with no contextual type, 'this' has the type |
| 146 | +// of the object literal. |
| 147 | +var obj1 = { |
| 148 | + a: 1, |
| 149 | + f: function () { |
| 150 | + return this.a; |
| 151 | + }, |
| 152 | + b: "hello", |
| 153 | + c: { |
| 154 | + g: function () { |
| 155 | + this.g(); |
| 156 | + } |
| 157 | + }, |
| 158 | + get d() { |
| 159 | + return this.a; |
| 160 | + }, |
| 161 | + get e() { |
| 162 | + return this.b; |
| 163 | + }, |
| 164 | + set e(value) { |
| 165 | + this.b = value; |
| 166 | + } |
| 167 | +}; |
| 168 | +var p1 = { |
| 169 | + x: 10, |
| 170 | + y: 20, |
| 171 | + moveBy: function (dx, dy) { |
| 172 | + this.x += dx; |
| 173 | + this.y += dy; |
| 174 | + } |
| 175 | +}; |
| 176 | +f1({ |
| 177 | + x: 10, |
| 178 | + y: 20, |
| 179 | + moveBy: function (dx, dy) { |
| 180 | + this.x += dx; |
| 181 | + this.y += dy; |
| 182 | + } |
| 183 | +}); |
| 184 | +var x1 = makeObject({ |
| 185 | + data: { x: 0, y: 0 }, |
| 186 | + methods: { |
| 187 | + moveBy: function (dx, dy) { |
| 188 | + this.x += dx; // Strongly typed this |
| 189 | + this.y += dy; // Strongly typed this |
| 190 | + } |
| 191 | + } |
| 192 | +}); |
| 193 | +var x2 = makeObject2({ |
| 194 | + data: { x: 0, y: 0 }, |
| 195 | + methods: { |
| 196 | + moveBy: function (dx, dy) { |
| 197 | + this.x += dx; // Strongly typed this |
| 198 | + this.y += dy; // Strongly typed this |
| 199 | + } |
| 200 | + } |
| 201 | +}); |
| 202 | +var vue = new Vue({ |
| 203 | + data: function () { return ({ x: 1, y: 2 }); }, |
| 204 | + methods: { |
| 205 | + f: function (x) { |
| 206 | + return this.x; |
| 207 | + } |
| 208 | + }, |
| 209 | + computed: { |
| 210 | + test: function () { |
| 211 | + return this.x; |
| 212 | + }, |
| 213 | + hello: { |
| 214 | + get: function () { |
| 215 | + return "hi"; |
| 216 | + }, |
| 217 | + set: function (value) { |
| 218 | + } |
| 219 | + } |
| 220 | + } |
| 221 | +}); |
| 222 | +vue; |
| 223 | +vue.x; |
| 224 | +vue.f("abc"); |
| 225 | +vue.test; |
| 226 | +vue.hello; |
| 227 | + |
| 228 | + |
| 229 | +//// [thisTypeInObjectLiterals2.d.ts] |
| 230 | +declare let obj1: { |
| 231 | + a: number; |
| 232 | + f(): number; |
| 233 | + b: string; |
| 234 | + c: { |
| 235 | + g(): void; |
| 236 | + }; |
| 237 | + readonly d: number; |
| 238 | + e: string; |
| 239 | +}; |
| 240 | +declare type Point = { |
| 241 | + x: number; |
| 242 | + y: number; |
| 243 | + moveBy(dx: number, dy: number): void; |
| 244 | +}; |
| 245 | +declare let p1: Point; |
| 246 | +declare function f1(p: Point): void; |
| 247 | +declare type ObjectDescriptor<D, M> = { |
| 248 | + data?: D; |
| 249 | + methods?: M & ThisType<D & M>; |
| 250 | +}; |
| 251 | +declare function makeObject<D, M>(desc: ObjectDescriptor<D, M>): D & M; |
| 252 | +declare let x1: { |
| 253 | + x: number; |
| 254 | + y: number; |
| 255 | +} & { |
| 256 | + moveBy(dx: number, dy: number): void; |
| 257 | +}; |
| 258 | +declare type ObjectDescriptor2<D, M> = ThisType<D & M> & { |
| 259 | + data?: D; |
| 260 | + methods?: M; |
| 261 | +}; |
| 262 | +declare function makeObject2<D, M>(desc: ObjectDescriptor<D, M>): D & M; |
| 263 | +declare let x2: { |
| 264 | + x: number; |
| 265 | + y: number; |
| 266 | +} & { |
| 267 | + moveBy(dx: number, dy: number): void; |
| 268 | +}; |
| 269 | +declare type Accessors<T> = { |
| 270 | + [K in keyof T]: (() => T[K]) | Computed<T[K]>; |
| 271 | +}; |
| 272 | +declare type Dictionary<T> = { |
| 273 | + [x: string]: T; |
| 274 | +}; |
| 275 | +declare type Computed<T> = { |
| 276 | + get?(): T; |
| 277 | + set?(value: T): void; |
| 278 | +}; |
| 279 | +declare type VueOptions<D, M, P> = ThisType<D & M & P> & { |
| 280 | + data?: D | (() => D); |
| 281 | + methods?: M; |
| 282 | + computed?: Accessors<P>; |
| 283 | +}; |
| 284 | +declare const Vue: new <D, M, P>(options: VueOptions<D, M, P>) => D & M & P; |
| 285 | +declare let vue: { |
| 286 | + x: number; |
| 287 | + y: number; |
| 288 | +} & { |
| 289 | + f(x: string): number; |
| 290 | +} & { |
| 291 | + test: number; |
| 292 | + hello: string; |
| 293 | +}; |
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