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DanielRosenwasserDanielRosenwasser
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Discard union types before considering weak type checks on unit-like types (#50423)
* Only check isUnitType when dealing with non-unions. * Add test case. * Accepted baselines.
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5 files changed

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lines changed

5 files changed

+315
-1
lines changed

‎src/compiler/checker.ts

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@@ -18901,7 +18901,7 @@ namespace ts {
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}
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}
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const isPerformingCommonPropertyChecks = (relation !== comparableRelation || relation === comparableRelation && isLiteralType(source)) &&
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const isPerformingCommonPropertyChecks = (relation !== comparableRelation || !(source.flags & TypeFlags.Union) && isLiteralType(source)) &&
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!(intersectionState & IntersectionState.Target) &&
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source.flags & (TypeFlags.Primitive | TypeFlags.Object | TypeFlags.Intersection) && source !== globalObjectType &&
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target.flags & (TypeFlags.Object | TypeFlags.Intersection) && isWeakType(target) &&

‎tests/baselines/reference/weakTypesAndLiterals01.js

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//// [weakTypesAndLiterals01.ts]
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type WeakTypes =
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| { optional?: true; }
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| { toLowerCase?(): string }
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| { toUpperCase?(): string, otherOptionalProp?: number };
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type LiteralsOrWeakTypes =
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| "A"
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| "B"
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| WeakTypes;
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declare let aOrB: "A" | "B";
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const f = (arg: LiteralsOrWeakTypes) => {
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if (arg === "A") {
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return arg;
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}
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else {
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return arg;
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}
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}
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const g = (arg: WeakTypes) => {
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if (arg === "A") {
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return arg;
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}
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else {
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return arg;
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}
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}
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const h = (arg: LiteralsOrWeakTypes) => {
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if (arg === aOrB) {
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return arg;
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}
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else {
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return arg;
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}
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}
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const i = (arg: WeakTypes) => {
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if (arg === aOrB) {
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return arg;
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}
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else {
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return arg;
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}
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}
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//// [weakTypesAndLiterals01.d.ts]
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type WeakTypes = {
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optional?: true;
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} | {
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toLowerCase?(): string;
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} | {
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toUpperCase?(): string;
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otherOptionalProp?: number;
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};
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type LiteralsOrWeakTypes = "A" | "B" | WeakTypes;
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declare let aOrB: "A" | "B";
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declare const f: (arg: LiteralsOrWeakTypes) => WeakTypes | "A" | "B";
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declare const g: (arg: WeakTypes) => WeakTypes;
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declare const h: (arg: LiteralsOrWeakTypes) => LiteralsOrWeakTypes;
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declare const i: (arg: WeakTypes) => WeakTypes;

‎tests/baselines/reference/weakTypesAndLiterals01.symbols

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=== tests/cases/conformance/types/typeRelationships/comparable/weakTypesAndLiterals01.ts ===
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type WeakTypes =
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>WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0))
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| { optional?: true; }
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>optional : Symbol(optional, Decl(weakTypesAndLiterals01.ts, 1, 7))
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| { toLowerCase?(): string }
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>toLowerCase : Symbol(toLowerCase, Decl(weakTypesAndLiterals01.ts, 2, 7))
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| { toUpperCase?(): string, otherOptionalProp?: number };
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>toUpperCase : Symbol(toUpperCase, Decl(weakTypesAndLiterals01.ts, 3, 7))
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>otherOptionalProp : Symbol(otherOptionalProp, Decl(weakTypesAndLiterals01.ts, 3, 31))
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type LiteralsOrWeakTypes =
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>LiteralsOrWeakTypes : Symbol(LiteralsOrWeakTypes, Decl(weakTypesAndLiterals01.ts, 3, 61))
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| "A"
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| "B"
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| WeakTypes;
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>WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0))
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declare let aOrB: "A" | "B";
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>aOrB : Symbol(aOrB, Decl(weakTypesAndLiterals01.ts, 10, 11))
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const f = (arg: LiteralsOrWeakTypes) => {
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>f : Symbol(f, Decl(weakTypesAndLiterals01.ts, 12, 5))
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11))
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>LiteralsOrWeakTypes : Symbol(LiteralsOrWeakTypes, Decl(weakTypesAndLiterals01.ts, 3, 61))
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if (arg === "A") {
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11))
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11))
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}
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else {
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 12, 11))
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}
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}
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const g = (arg: WeakTypes) => {
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>g : Symbol(g, Decl(weakTypesAndLiterals01.ts, 21, 5))
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11))
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>WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0))
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if (arg === "A") {
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11))
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11))
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}
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else {
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 21, 11))
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}
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}
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const h = (arg: LiteralsOrWeakTypes) => {
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>h : Symbol(h, Decl(weakTypesAndLiterals01.ts, 30, 5))
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11))
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>LiteralsOrWeakTypes : Symbol(LiteralsOrWeakTypes, Decl(weakTypesAndLiterals01.ts, 3, 61))
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if (arg === aOrB) {
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11))
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>aOrB : Symbol(aOrB, Decl(weakTypesAndLiterals01.ts, 10, 11))
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11))
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}
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else {
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 30, 11))
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}
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}
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const i = (arg: WeakTypes) => {
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>i : Symbol(i, Decl(weakTypesAndLiterals01.ts, 39, 5))
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11))
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>WeakTypes : Symbol(WeakTypes, Decl(weakTypesAndLiterals01.ts, 0, 0))
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if (arg === aOrB) {
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11))
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>aOrB : Symbol(aOrB, Decl(weakTypesAndLiterals01.ts, 10, 11))
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11))
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}
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else {
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return arg;
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>arg : Symbol(arg, Decl(weakTypesAndLiterals01.ts, 39, 11))
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}
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}
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‎tests/baselines/reference/weakTypesAndLiterals01.types

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=== tests/cases/conformance/types/typeRelationships/comparable/weakTypesAndLiterals01.ts ===
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type WeakTypes =
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>WeakTypes : { optional?: true | undefined; } | { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; }
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| { optional?: true; }
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>optional : true | undefined
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>true : true
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| { toLowerCase?(): string }
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>toLowerCase : (() => string) | undefined
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| { toUpperCase?(): string, otherOptionalProp?: number };
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>toUpperCase : (() => string) | undefined
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>otherOptionalProp : number | undefined
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type LiteralsOrWeakTypes =
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>LiteralsOrWeakTypes : WeakTypes | "A" | "B"
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| "A"
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| "B"
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| WeakTypes;
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declare let aOrB: "A" | "B";
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>aOrB : "A" | "B"
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const f = (arg: LiteralsOrWeakTypes) => {
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>f : (arg: LiteralsOrWeakTypes) => WeakTypes | "A" | "B"
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>(arg: LiteralsOrWeakTypes) => { if (arg === "A") { return arg; } else { return arg; }} : (arg: LiteralsOrWeakTypes) => WeakTypes | "A" | "B"
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>arg : LiteralsOrWeakTypes
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if (arg === "A") {
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>arg === "A" : boolean
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>arg : LiteralsOrWeakTypes
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>"A" : "A"
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return arg;
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>arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; } | "A"
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}
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else {
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return arg;
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>arg : WeakTypes | "B"
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}
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}
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const g = (arg: WeakTypes) => {
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>g : (arg: WeakTypes) => WeakTypes
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>(arg: WeakTypes) => { if (arg === "A") { return arg; } else { return arg; }} : (arg: WeakTypes) => WeakTypes
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>arg : WeakTypes
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if (arg === "A") {
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>arg === "A" : boolean
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>arg : WeakTypes
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>"A" : "A"
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return arg;
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>arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; }
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}
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else {
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return arg;
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>arg : WeakTypes
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}
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}
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const h = (arg: LiteralsOrWeakTypes) => {
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>h : (arg: LiteralsOrWeakTypes) => LiteralsOrWeakTypes
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>(arg: LiteralsOrWeakTypes) => { if (arg === aOrB) { return arg; } else { return arg; }} : (arg: LiteralsOrWeakTypes) => LiteralsOrWeakTypes
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>arg : LiteralsOrWeakTypes
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if (arg === aOrB) {
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>arg === aOrB : boolean
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>arg : LiteralsOrWeakTypes
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>aOrB : "A" | "B"
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return arg;
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>arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; } | "A" | "B"
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}
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else {
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return arg;
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>arg : LiteralsOrWeakTypes
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}
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}
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const i = (arg: WeakTypes) => {
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>i : (arg: WeakTypes) => WeakTypes
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>(arg: WeakTypes) => { if (arg === aOrB) { return arg; } else { return arg; }} : (arg: WeakTypes) => WeakTypes
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>arg : WeakTypes
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if (arg === aOrB) {
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>arg === aOrB : boolean
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>arg : WeakTypes
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>aOrB : "A" | "B"
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return arg;
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>arg : { toLowerCase?(): string; } | { toUpperCase?(): string; otherOptionalProp?: number | undefined; }
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}
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else {
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return arg;
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>arg : WeakTypes
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}
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}
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‎tests/cases/conformance/types/typeRelationships/comparable/weakTypesAndLiterals01.ts

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// @strict: true
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// @declaration: true
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// @emitDeclarationOnly: true
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type WeakTypes =
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| { optional?: true; }
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| { toLowerCase?(): string }
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| { toUpperCase?(): string, otherOptionalProp?: number };
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type LiteralsOrWeakTypes =
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| "A"
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| "B"
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| WeakTypes;
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declare let aOrB: "A" | "B";
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const f = (arg: LiteralsOrWeakTypes) => {
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if (arg === "A") {
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return arg;
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}
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else {
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return arg;
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}
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}
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const g = (arg: WeakTypes) => {
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if (arg === "A") {
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return arg;
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}
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else {
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return arg;
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}
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}
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const h = (arg: LiteralsOrWeakTypes) => {
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if (arg === aOrB) {
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return arg;
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}
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else {
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return arg;
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}
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}
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const i = (arg: WeakTypes) => {
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if (arg === aOrB) {
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return arg;
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}
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else {
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return arg;
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}
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}

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