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Shortcut relations in getNarrowedTypeWorker when comparing literals #56072

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Jake Bailey (jakebailey) wants to merge 7 commits into from
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Shortcut relations in getNarrowedTypeWorker when comparing literals #56072

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b19c64d
Optimize getNarrowedTypeWorker for literals
jakebailey Oct 11, 2023
54d0bc7
revert unrelated
jakebailey Oct 11, 2023
629de0d
Fixup
jakebailey Oct 12, 2023
53f60d1
Fix bools, leave todo
jakebailey Oct 12, 2023
e68e177
Try out new thing for all relations
jakebailey Oct 12, 2023
247724d
Revert change
jakebailey Oct 12, 2023
f993810
Merge branch 'main' into fix-55948
jakebailey Jan 19, 2024
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32 changes: 31 additions & 1 deletion src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -21118,6 +21118,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
if (source === target) {
return true;
}

if (relation !== identityRelation) {
if (relation === comparableRelation && !(target.flags & TypeFlags.Never) && isSimpleTypeRelatedTo(target, source, relation) || isSimpleTypeRelatedTo(source, target, relation)) {
return true;
Expand Down Expand Up @@ -28715,7 +28716,36 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
matching || type,
checkDerived ?
t => isTypeDerivedFrom(t, c) ? t : isTypeDerivedFrom(c, t) ? c : neverType :
t => isTypeStrictSubtypeOf(t, c) ? t : isTypeStrictSubtypeOf(c, t) ? c : isTypeSubtypeOf(t, c) ? t : isTypeSubtypeOf(c, t) ? c : neverType,
t => {
// WAS: isTypeStrictSubtypeOf(t, c) ? t : isTypeStrictSubtypeOf(c, t) ? c : isTypeSubtypeOf(t, c) ? t : isTypeSubtypeOf(c, t) ? c : neverType;

// Avoid going through relations for comparison between literals of the same types;
// if they're not equal then they're not related and we can skip doing a bunch of work.
if (
t.flags & TypeFlags.Literal
&& (t.flags & TypeFlags.Literal) === (c.flags & TypeFlags.Literal)
&& !(t.flags & TypeFlags.EnumLiteral && c.flags & TypeFlags.EnumLiteral)
) {
if (t.flags & TypeFlags.BooleanLiteral) {
const tIsTrue = t === trueType || t === regularTrueType;
const cIsTrue = c === trueType || c === regularTrueType;
return tIsTrue === cIsTrue ? t : neverType;
}
return (t as LiteralType).value === (c as LiteralType).value ? t : neverType;
}

if (isTypeStrictSubtypeOf(t, c)) return t;
if (isTypeStrictSubtypeOf(c, t)) return c;

// Strict subtyping is equivalent to subtyping for these types (and likely others).
// TODO(jakebailey): what other things can we quickly check here?
if (t.flags & TypeFlags.Unit && c.flags & TypeFlags.Unit) return neverType;

if (isTypeSubtypeOf(t, c)) return t;
if (isTypeSubtypeOf(c, t)) return c;

return neverType;
},
);
// If no constituents are directly related, create intersections for any generic constituents that
// are related by constraint.
Expand Down