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Make 'instanceof' behave like TS if the lhs is nullable

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This commit is contained in:
dcodeIO
2018-06-09 02:01:45 +02:00
parent 7478c8a0d3
commit 47f2e0950a
8 changed files with 220 additions and 54 deletions
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19
tests/compiler/instanceof.ts
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@ -37,13 +37,14 @@ function isI32<T>(v: T): bool {
assert( isI32(0));
assert(!isI32(0.0));
assert(!isI32(<u32>0)); // signedness is relevant
// TODO: what about nullables?
// var an: A | null;
// var bn: B | null;
//
// assert(an instanceof A);
// assert(bn instanceof A);
//
// assert(!(an instanceof B));
// assert(bn instanceof B);
var an: A | null = null;
assert(!(an instanceof A)); // TS: null is not an instance of A
assert( an instanceof A | null); // AS: null is an instance of A | null
an = changetype<A | null>(1);
assert( an instanceof A); // TS: non-null is an instance of A
assert( an instanceof A | null); // AS: non-null is an instance of A | null
// TODO: keep track of nullability during flows, so this becomes precomputable:
// assert(an !== null && an instanceof A);