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105 lines
3.5 KiB
TypeScript
105 lines
3.5 KiB
TypeScript
// @strict: true
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// @noUncheckedIndexedAccess: true
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type CheckBooleanOnly<T extends boolean> = any;
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// Validate CheckBooleanOnly works - should error
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type T_ERR1 = CheckBooleanOnly<boolean | undefined>;
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enum NumericEnum1 { A, B, C }
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enum NumericEnum2 { A = 0, B = 1 , C = 2 }
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enum StringEnum1 { A = "Alpha", B = "Beta" }
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declare const strMap: { [s: string]: boolean };
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// All of these should be errors
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const e1: boolean = strMap["foo"];
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const e2: boolean = strMap.bar;
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const e3: boolean = strMap[0];
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const e4: boolean = strMap[0 as string | number];
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const e5: boolean = strMap[0 as string | 0 | 1];
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const e6: boolean = strMap[0 as 0 | 1];
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const e7: boolean = strMap["foo" as "foo" | "baz"];
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const e8: boolean = strMap[NumericEnum1.A];
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const e9: boolean = strMap[NumericEnum2.A];
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const e10: boolean = strMap[StringEnum1.A];
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const e11: boolean = strMap[StringEnum1.A as StringEnum1];
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const e12: boolean = strMap[NumericEnum1.A as NumericEnum1];
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const e13: boolean = strMap[NumericEnum2.A as NumericEnum2];
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const e14: boolean = strMap[null as any];
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// Should be OK
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const ok1: boolean | undefined = strMap["foo"];
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const ok2: boolean | undefined = strMap.bar;
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type T_OK1 = CheckBooleanOnly<(typeof strMap)[string]>;
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type T_OK2 = CheckBooleanOnly<(typeof strMap)["foo"]>;
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type T_OK3 = CheckBooleanOnly<(typeof strMap)["bar" | "baz"]>;
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type T_OK4 = CheckBooleanOnly<(typeof strMap)[number]>;
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type T_OK5 = CheckBooleanOnly<(typeof strMap)[any]>;
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// Writes don't allow 'undefined'; all should be errors
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strMap["baz"] = undefined;
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strMap.qua = undefined;
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strMap[0] = undefined;
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strMap[null as any] = undefined;
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// Numeric lookups are unaffected
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declare const numMap: { [s: number]: boolean };
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// All of these should be ok
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const num_ok1: boolean = numMap[0];
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const num_ok2: boolean = numMap[0 as number];
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const num_ok3: boolean = numMap[0 as 0 | 1];
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const num_ok4: boolean = numMap[NumericEnum1.A];
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const num_ok5: boolean = numMap[NumericEnum2.A];
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// Generics
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function generic1<T extends { [s: string]: boolean }>(arg: T): boolean {
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// Should error
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return arg["blah"];
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}
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function generic2<T extends { [s: string]: boolean }>(arg: T): boolean {
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// Should OK
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return arg["blah"]!;
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}
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function generic3<T extends string>(arg: T): boolean {
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// Should error
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return strMap[arg];
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}
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// Element access into known properties is ok
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declare const obj1: { x: string, y: number, [key: string]: string | number };
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obj1["x"];
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const y = "y";
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obj1[y];
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let yy = "y";
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obj1[yy];
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let z = "z";
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obj1[z];
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// Distributivity cases
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declare const strMapUnion: { [s: string]: boolean } | { [s: string]: number };
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// Should error
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const f1: boolean | number = strMapUnion["foo"];
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// Symbol index signatures
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declare const s: unique symbol;
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declare const symbolMap: { [s]: string };
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const e15: string = symbolMap[s]; // Should OK
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symbolMap[s] = undefined; // Should error
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// Variadic tuples
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declare const nonEmptyStringArray: [string, ...string[]];
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const variadicOk1: string = nonEmptyStringArray[0]; // Should OK
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const variadicError1: string = nonEmptyStringArray[1]; // Should error
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// Generic index type
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declare const myRecord1: { a: string; b: string };
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declare const myRecord2: { a: string; b: string, [key: string]: string };
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const fn1 = <Key extends keyof typeof myRecord1>(key: Key): string => myRecord1[key]; // Should OK
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const fn2 = <Key extends keyof typeof myRecord1>(key: Key): string => myRecord2[key]; // Should OK
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const fn3 = <Key extends keyof typeof myRecord2>(key: Key) => {
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myRecord2[key] = undefined; // Should error
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const v: string = myRecord2[key]; // Should error
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};
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