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=== tests/cases/compiler/narrowingAssignmentReadonlyRespectsAssertion.ts ===
// https://github.com/microsoft/TypeScript/issues/41984
interface TestCase<T extends string | number> {
>TestCase : Symbol(TestCase, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 0, 0))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 2, 19))
readonly val1: T | ReadonlyArray<T>;
>val1 : Symbol(TestCase.val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 2, 47))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 2, 19))
>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 2, 19))
readonly val2: ReadonlyArray<T>;
>val2 : Symbol(TestCase.val2, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 3, 38))
>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 2, 19))
}
interface MultiCaseFixture<T> {
>MultiCaseFixture : Symbol(MultiCaseFixture, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 5, 1))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 7, 27))
cases: T[];
>cases : Symbol(MultiCaseFixture.cases, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 7, 31))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 7, 27))
}
function subDataFunc(): TestCase<string | number>[] {
>subDataFunc : Symbol(subDataFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 9, 1))
>TestCase : Symbol(TestCase, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 0, 0))
return [
{ val1: "a", val2: ["a", "b", "c"] },
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 13, 7))
>val2 : Symbol(val2, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 13, 18))
{ val1: 2, val2: [1, 2, 3] },
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 14, 7))
>val2 : Symbol(val2, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 14, 16))
{ val1: ["a", "z"], val2: ["x", "y", "z"] },
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 15, 7))
>val2 : Symbol(val2, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 15, 25))
{ val1: [5, 10], val2: [10, 100, 1000] },
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 16, 7))
>val2 : Symbol(val2, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 16, 22))
];
}
function dataFunc<T>(subFunc: () => T[]): MultiCaseFixture<T> {
>dataFunc : Symbol(dataFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 18, 1))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 20, 18))
>subFunc : Symbol(subFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 20, 21))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 20, 18))
>MultiCaseFixture : Symbol(MultiCaseFixture, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 5, 1))
>T : Symbol(T, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 20, 18))
return { cases: subFunc() };
>cases : Symbol(cases, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 21, 10))
>subFunc : Symbol(subFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 20, 21))
}
function testFunc() {
>testFunc : Symbol(testFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 22, 1))
const fixture = dataFunc<TestCase<string | number>>(subDataFunc);
>fixture : Symbol(fixture, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 25, 7))
>dataFunc : Symbol(dataFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 18, 1))
>TestCase : Symbol(TestCase, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 0, 0))
>subDataFunc : Symbol(subDataFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 9, 1))
fixture.cases.forEach(({ val1, val2 }) => {
>fixture.cases.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --))
>fixture.cases : Symbol(MultiCaseFixture.cases, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 7, 31))
>fixture : Symbol(fixture, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 25, 7))
>cases : Symbol(MultiCaseFixture.cases, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 7, 31))
>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --))
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 26, 26))
>val2 : Symbol(val2, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 26, 32))
if (Array.isArray(val1)) {
>Array.isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
>Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
>isArray : Symbol(ArrayConstructor.isArray, Decl(lib.es5.d.ts, --, --))
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 26, 26))
// This should retain val1 as being an array
const reversedVal1 = val1.slice().reverse();
>reversedVal1 : Symbol(reversedVal1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 29, 15))
>val1.slice().reverse : Symbol(Array.reverse, Decl(lib.es5.d.ts, --, --))
>val1.slice : Symbol(Array.slice, Decl(lib.es5.d.ts, --, --))
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 26, 26))
>slice : Symbol(Array.slice, Decl(lib.es5.d.ts, --, --))
>reverse : Symbol(Array.reverse, Decl(lib.es5.d.ts, --, --))
console.log(reversedVal1);
>console.log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>console : Symbol(console, Decl(lib.dom.d.ts, --, --))
>log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>reversedVal1 : Symbol(reversedVal1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 29, 15))
} else {
console.log(val1);
>console.log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>console : Symbol(console, Decl(lib.dom.d.ts, --, --))
>log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>val1 : Symbol(val1, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 26, 26))
}
console.log(val2);
>console.log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>console : Symbol(console, Decl(lib.dom.d.ts, --, --))
>log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
>val2 : Symbol(val2, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 26, 32))
});
}
testFunc();
>testFunc : Symbol(testFunc, Decl(narrowingAssignmentReadonlyRespectsAssertion.ts, 22, 1))
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