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Add tests for generic startsWith/endsWith
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lines changed

‎tests/baselines/reference/stringEndsWith.errors.txt

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tests/cases/compiler/stringEndsWith.ts(9,46): error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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tests/cases/compiler/stringEndsWith.ts(10,46): error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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tests/cases/compiler/stringEndsWith.ts(11,56): error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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tests/cases/compiler/stringEndsWith.ts(12,56): error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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==== tests/cases/compiler/stringEndsWith.ts (4 errors) ====
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declare var test: string;
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declare function requirePostfix(input: `${string}test`): void;
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// works
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if (test.endsWith('test')) requirePostfix(test);
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if (test.endsWith('test', undefined)) requirePostfix(test);
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// errors
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if (test.endsWith('test', 0)) requirePostfix(test);
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~~~~
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!!! error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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if (test.endsWith('test', 1)) requirePostfix(test);
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~~~~
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!!! error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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if (test.endsWith('test', 0 as number)) requirePostfix(test);
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~~~~
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!!! error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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if (test.endsWith('test', 1 as number)) requirePostfix(test);
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~~~~
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!!! error TS2345: Argument of type 'string' is not assignable to parameter of type '`${string}test`'.
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‎tests/baselines/reference/stringEndsWith.js

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//// [stringEndsWith.ts]
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declare var test: string;
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declare function requirePostfix(input: `${string}test`): void;
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// works
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if (test.endsWith('test')) requirePostfix(test);
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if (test.endsWith('test', undefined)) requirePostfix(test);
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// errors
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if (test.endsWith('test', 0)) requirePostfix(test);
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if (test.endsWith('test', 1)) requirePostfix(test);
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if (test.endsWith('test', 0 as number)) requirePostfix(test);
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if (test.endsWith('test', 1 as number)) requirePostfix(test);
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//// [stringEndsWith.js]
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// works
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if (test.endsWith('test'))
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requirePostfix(test);
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if (test.endsWith('test', undefined))
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requirePostfix(test);
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// errors
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if (test.endsWith('test', 0))
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requirePostfix(test);
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if (test.endsWith('test', 1))
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requirePostfix(test);
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if (test.endsWith('test', 0))
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requirePostfix(test);
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if (test.endsWith('test', 1))
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requirePostfix(test);

‎tests/baselines/reference/stringEndsWith.symbols

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=== tests/cases/compiler/stringEndsWith.ts ===
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declare var test: string;
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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declare function requirePostfix(input: `${string}test`): void;
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>requirePostfix : Symbol(requirePostfix, Decl(stringEndsWith.ts, 0, 25))
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>input : Symbol(input, Decl(stringEndsWith.ts, 1, 32))
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// works
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if (test.endsWith('test')) requirePostfix(test);
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>test.endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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>endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePostfix : Symbol(requirePostfix, Decl(stringEndsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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if (test.endsWith('test', undefined)) requirePostfix(test);
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>test.endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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>endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>undefined : Symbol(undefined)
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>requirePostfix : Symbol(requirePostfix, Decl(stringEndsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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// errors
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if (test.endsWith('test', 0)) requirePostfix(test);
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>test.endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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>endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePostfix : Symbol(requirePostfix, Decl(stringEndsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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if (test.endsWith('test', 1)) requirePostfix(test);
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>test.endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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>endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePostfix : Symbol(requirePostfix, Decl(stringEndsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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if (test.endsWith('test', 0 as number)) requirePostfix(test);
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>test.endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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>endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePostfix : Symbol(requirePostfix, Decl(stringEndsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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if (test.endsWith('test', 1 as number)) requirePostfix(test);
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>test.endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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>endsWith : Symbol(String.endsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePostfix : Symbol(requirePostfix, Decl(stringEndsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringEndsWith.ts, 0, 11))
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‎tests/baselines/reference/stringEndsWith.types

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=== tests/cases/compiler/stringEndsWith.ts ===
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declare var test: string;
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>test : string
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declare function requirePostfix(input: `${string}test`): void;
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>requirePostfix : (input: `${string}test`) => void
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>input : `${string}test`
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// works
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if (test.endsWith('test')) requirePostfix(test);
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>test.endsWith('test') : boolean
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>test.endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>test : string
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>endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>'test' : "test"
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>requirePostfix(test) : void
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>requirePostfix : (input: `${string}test`) => void
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>test : `${string}test`
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if (test.endsWith('test', undefined)) requirePostfix(test);
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>test.endsWith('test', undefined) : boolean
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>test.endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>test : string
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>endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>'test' : "test"
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>undefined : undefined
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>requirePostfix(test) : void
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>requirePostfix : (input: `${string}test`) => void
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>test : `${string}test`
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// errors
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if (test.endsWith('test', 0)) requirePostfix(test);
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>test.endsWith('test', 0) : boolean
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>test.endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>test : string
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>endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>'test' : "test"
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>0 : 0
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>requirePostfix(test) : void
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>requirePostfix : (input: `${string}test`) => void
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>test : string
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if (test.endsWith('test', 1)) requirePostfix(test);
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>test.endsWith('test', 1) : boolean
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>test.endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>test : string
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>endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>'test' : "test"
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>1 : 1
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>requirePostfix(test) : void
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>requirePostfix : (input: `${string}test`) => void
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>test : string
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if (test.endsWith('test', 0 as number)) requirePostfix(test);
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>test.endsWith('test', 0 as number) : boolean
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>test.endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>test : string
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>endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>'test' : "test"
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>0 as number : number
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>0 : 0
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>requirePostfix(test) : void
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>requirePostfix : (input: `${string}test`) => void
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>test : string
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if (test.endsWith('test', 1 as number)) requirePostfix(test);
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>test.endsWith('test', 1 as number) : boolean
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>test.endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>test : string
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>endsWith : { <T extends string>(searchString: T, endPosition?: undefined): this is `${string}${T}`; (searchString: string, endPosition?: number): boolean; }
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>'test' : "test"
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>1 as number : number
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>1 : 1
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>requirePostfix(test) : void
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>requirePostfix : (input: `${string}test`) => void
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>test : string
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‎tests/baselines/reference/stringStartsWith.errors.txt

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tests/cases/compiler/stringStartsWith.ts(10,47): error TS2345: Argument of type 'string' is not assignable to parameter of type '`test${string}`'.
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tests/cases/compiler/stringStartsWith.ts(11,57): error TS2345: Argument of type 'string' is not assignable to parameter of type '`test${string}`'.
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tests/cases/compiler/stringStartsWith.ts(12,57): error TS2345: Argument of type 'string' is not assignable to parameter of type '`test${string}`'.
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==== tests/cases/compiler/stringStartsWith.ts (3 errors) ====
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declare var test: string;
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declare function requirePrefix(input: `test${string}`): void;
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// works
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if (test.startsWith('test')) requirePrefix(test);
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if (test.startsWith('test', undefined)) requirePrefix(test);
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if (test.startsWith('test', 0)) requirePrefix(test);
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// errors
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if (test.startsWith('test', 1)) requirePrefix(test);
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~~~~
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!!! error TS2345: Argument of type 'string' is not assignable to parameter of type '`test${string}`'.
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if (test.startsWith('test', 0 as number)) requirePrefix(test);
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~~~~
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!!! error TS2345: Argument of type 'string' is not assignable to parameter of type '`test${string}`'.
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if (test.startsWith('test', 1 as number)) requirePrefix(test);
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~~~~
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!!! error TS2345: Argument of type 'string' is not assignable to parameter of type '`test${string}`'.
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‎tests/baselines/reference/stringStartsWith.js

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//// [stringStartsWith.ts]
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declare var test: string;
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declare function requirePrefix(input: `test${string}`): void;
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// works
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if (test.startsWith('test')) requirePrefix(test);
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if (test.startsWith('test', undefined)) requirePrefix(test);
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if (test.startsWith('test', 0)) requirePrefix(test);
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// errors
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if (test.startsWith('test', 1)) requirePrefix(test);
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if (test.startsWith('test', 0 as number)) requirePrefix(test);
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if (test.startsWith('test', 1 as number)) requirePrefix(test);
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//// [stringStartsWith.js]
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// works
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if (test.startsWith('test'))
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requirePrefix(test);
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if (test.startsWith('test', undefined))
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requirePrefix(test);
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if (test.startsWith('test', 0))
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requirePrefix(test);
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// errors
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if (test.startsWith('test', 1))
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requirePrefix(test);
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if (test.startsWith('test', 0))
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requirePrefix(test);
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if (test.startsWith('test', 1))
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requirePrefix(test);

‎tests/baselines/reference/stringStartsWith.symbols

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=== tests/cases/compiler/stringStartsWith.ts ===
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declare var test: string;
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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declare function requirePrefix(input: `test${string}`): void;
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>requirePrefix : Symbol(requirePrefix, Decl(stringStartsWith.ts, 0, 25))
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>input : Symbol(input, Decl(stringStartsWith.ts, 1, 31))
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// works
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if (test.startsWith('test')) requirePrefix(test);
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>test.startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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>startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePrefix : Symbol(requirePrefix, Decl(stringStartsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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if (test.startsWith('test', undefined)) requirePrefix(test);
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>test.startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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>startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>undefined : Symbol(undefined)
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>requirePrefix : Symbol(requirePrefix, Decl(stringStartsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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if (test.startsWith('test', 0)) requirePrefix(test);
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>test.startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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>startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePrefix : Symbol(requirePrefix, Decl(stringStartsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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// errors
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if (test.startsWith('test', 1)) requirePrefix(test);
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>test.startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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>startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePrefix : Symbol(requirePrefix, Decl(stringStartsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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if (test.startsWith('test', 0 as number)) requirePrefix(test);
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>test.startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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>startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePrefix : Symbol(requirePrefix, Decl(stringStartsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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if (test.startsWith('test', 1 as number)) requirePrefix(test);
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>test.startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
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>startsWith : Symbol(String.startsWith, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
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>requirePrefix : Symbol(requirePrefix, Decl(stringStartsWith.ts, 0, 25))
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>test : Symbol(test, Decl(stringStartsWith.ts, 0, 11))
53+

‎tests/baselines/reference/stringStartsWith.types

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=== tests/cases/compiler/stringStartsWith.ts ===
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declare var test: string;
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>test : string
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declare function requirePrefix(input: `test${string}`): void;
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>requirePrefix : (input: `test${string}`) => void
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>input : `test${string}`
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// works
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if (test.startsWith('test')) requirePrefix(test);
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>test.startsWith('test') : boolean
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>test.startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>test : string
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>startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>'test' : "test"
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>requirePrefix(test) : void
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>requirePrefix : (input: `test${string}`) => void
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>test : `test${string}`
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if (test.startsWith('test', undefined)) requirePrefix(test);
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>test.startsWith('test', undefined) : boolean
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>test.startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>test : string
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>startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>'test' : "test"
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>undefined : undefined
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>requirePrefix(test) : void
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>requirePrefix : (input: `test${string}`) => void
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>test : `test${string}`
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if (test.startsWith('test', 0)) requirePrefix(test);
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>test.startsWith('test', 0) : boolean
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>test.startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>test : string
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>startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>'test' : "test"
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>0 : 0
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>requirePrefix(test) : void
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>requirePrefix : (input: `test${string}`) => void
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>test : `test${string}`
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// errors
43+
if (test.startsWith('test', 1)) requirePrefix(test);
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>test.startsWith('test', 1) : boolean
45+
>test.startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>test : string
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>startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>'test' : "test"
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>1 : 1
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>requirePrefix(test) : void
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>requirePrefix : (input: `test${string}`) => void
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>test : string
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if (test.startsWith('test', 0 as number)) requirePrefix(test);
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>test.startsWith('test', 0 as number) : boolean
56+
>test.startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>test : string
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>startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
59+
>'test' : "test"
60+
>0 as number : number
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>0 : 0
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>requirePrefix(test) : void
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>requirePrefix : (input: `test${string}`) => void
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>test : string
65+
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if (test.startsWith('test', 1 as number)) requirePrefix(test);
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>test.startsWith('test', 1 as number) : boolean
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>test.startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>test : string
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>startsWith : { <T extends string>(searchString: T, position?: 0): this is `${T}${string}`; (searchString: string, position?: number): boolean; }
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>'test' : "test"
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>1 as number : number
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>1 : 1
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>requirePrefix(test) : void
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>requirePrefix : (input: `test${string}`) => void
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>test : string
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‎tests/cases/compiler/stringEndsWith.ts

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// @target: es2015
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declare var test: string;
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declare function requirePostfix(input: `${string}test`): void;
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// works
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if (test.endsWith('test')) requirePostfix(test);
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if (test.endsWith('test', undefined)) requirePostfix(test);
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// errors
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if (test.endsWith('test', 0)) requirePostfix(test);
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if (test.endsWith('test', 1)) requirePostfix(test);
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if (test.endsWith('test', 0 as number)) requirePostfix(test);
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if (test.endsWith('test', 1 as number)) requirePostfix(test);

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