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Time To Read Blog I have some parts in my code that require valid DateTimes. With @types/luxon:3.7.1 I could check "myDate.isValid" and typescript was able to infer, that the datetime generic is true.
With 3.7.2 this is no longer the case. Book Articals

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function actionThatRequiresValidDate(date: DateTime<true>) { console.log(`yes, ${date.toISODate()} is valid`) } const myDate = DateTime.fromISO("2026-05-23") if (myDate.isValid) { actionThatRequiresValidDate(myDate) } 

Read Aloud Stories For Kids The code above doesn't compile anymore because typescript still assumes that the generic is "boolean" and not "true". Cosplay Business Cards

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Songs For Instagram Stories You're right, I tested it locally, and since the removal of DateTimeMaybeValid, it makes a difference for the isValid field based on the incoming checking type. New Featured Product Sign

function foo(dt: DateTime) { if (dt.isValid) { dt // <-- DateTime } } // vs. function bar(dt: DateTime<true> | DateTime<false>) { if (dt.isValid) { dt // <-- DateTime<true>; } }

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Instagram Story Ideas For Marketing Your Product I apologise, Instagram On Laptop, this must have slipped through my analysis of DateTimeMaybeValid because there is no test case covering such a feature/behaviour. Bigginer Blogg Website Examples

Tech Product Launch Stage Ideally, I would expect TypeScript to be able to narrow down the generic without requiring a manual union type. I hate to say it, but from a TypeScript perspective, the library should have used a function or static type guard for validation checking rather than a normal getter. Insurance Business Cards

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Online News Site Layout Running the repro from the first post unchanged against each published version, this only reproduces on 3.7.4: Unique Post Ideas

 3.7.1 3.7.2 3.7.3 3.7.4 TS 5.4.5 narrows narrows narrows fails TS 5.9.3 narrows narrows narrows fails TS 6.0.3 narrows narrows narrows fails error TS2345: Argument of type 'DateTime<boolean>' is not assignable to parameter of type 'DateTime<true>'. 

Lot Plan Layout so it doesn't look version-dependent on the TypeScript side, and 3.7.2 comes up clean here. Worth noting --skipLibCheck is needed to see this on TS 5.x: without it 3.7.x fails first on an unrelated Intl.DateTimeFormatPart error, which looks similar enough to be mistaken for the same breakage. Product Presentation Slide Template

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// 3.7.3 static fromISO(text: string, opts?: DateTimeOptions): DateTimeMaybeValid; // DateTime<true> | DateTime<false> // 3.7.4 static fromISO(text: string, opts?: DateTimeOptions): DateTime; // DateTime<boolean>

What We Have Read Display if (dt.isValid) is discriminant narrowing, which works by selecting among the members of a union. DateTime<boolean> is a single instantiation, so there is nothing to select and IsValid stays boolean. The check proves dt.isValid === true, but that never reaches the type argument. The declared type is the only thing that differs here: Bugle Last Post

declare class DT<IsValid extends boolean = boolean> { get isValid(): IsValid brand(): IsValid } declare function fromUnion(): DT<true> | DT<false> // 3.7.3 declare function fromSingle(): DT<boolean> // 3.7.4 function a() { const d = fromUnion(); if (!d.isValid) throw 0; const p: true = d.brand() } // ok function b() { const d = fromSingle(); if (!d.isValid) throw 0; const p: true = d.brand() } // Type 'boolean' is not assignable to type 'true'

How To Do A Website On Peper toISODate() is affected the same way: inside a branch where isValid has already been checked it now returns string | null, since IfValid<string, null, boolean> distributes over true | false. luxon 3.7.2 only returns null there when the DateTime is invalid, so the null is unreachable in that branch but still has to be handled. Internet History Timeline

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Product Reveal Posts The negative-branch problem that motivated Product Launch Party Graphic and this one appear to be independent. Excluding DateTime in the else branch of isDateTime needs the guard to assert the bare type, and if (isValid) narrowing needs the factories to return the union; neither fix requires the other. Keeping the guard changes from LinkedIn Post Sample and restoring only the factory and method return types to DateTimeMaybeValid/IntervalMaybeValid/DurationMaybeValid passes both repros here, along with the cases I could think of that touch the seam between them: a factory result assigned to a bare DateTime, a factory result through the guard's negative branch, and the DateTime | string case from Das Idee. Show Me One Year Silver Price Chart

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