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Alternate solution to @ThePrimeagen's typescript problem in AOC day 2, 2022 stream
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| interface FooEvent { | |
| ack: { ack: string }; | |
| bash: { bash: string }; | |
| bar: { bar: string }; | |
| buzz: { buzz: string }; | |
| } | |
| interface BarEvent { | |
| ack: { ack: string }; | |
| bash: { bash: string }; | |
| buzz: { buzz: string }; | |
| } | |
| // as opposed to type guards, casting, or this shit: https://www.totaltypescript.com/tips/use-generics-to-dynamically-specify-the-number-and-type-of-arguments-to-functions | |
| // when your types don't have a natural distriminator field imo the best option | |
| // is to define a new type with a discriminator field and a field with your type | |
| type TypeToEvent = | |
| | { | |
| type: "bar"; | |
| event: BarEvent; | |
| } | |
| | { | |
| type: "foo"; | |
| event: FooEvent; | |
| }; | |
| export function write({ type, event }: TypeToEvent) { | |
| if (type === "foo") { | |
| console.log(type, event.bar); | |
| } | |
| } | |
| write({ | |
| type: "foo", | |
| event: { | |
| ack: { ack: "ack" }, | |
| bash: { bash: "bash" }, | |
| // bar: { bar: "bar" }, | |
| buzz: { buzz: "buzz" }, | |
| }, | |
| }); |
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Learn more about bidirectional Unicode characters
| interface FooEvent { | |
| ack: { ack: string }; | |
| bash: { bash: string }; | |
| bar: { bar: string }; | |
| buzz: { buzz: string }; | |
| } | |
| interface BarEvent { | |
| ack: { ack: string }; | |
| bash: { bash: string }; | |
| buzz: { buzz: string }; | |
| } | |
| interface TypeToEvent { | |
| foo: FooEvent; | |
| bar: BarEvent; | |
| } | |
| export function write( | |
| type: keyof TypeToEvent, | |
| event: TypeToEvent[keyof TypeToEvent], | |
| ) { | |
| if (type === "foo") { | |
| console.log(type, event.bar); | |
| } | |
| } | |
| write("foo", { | |
| ack: { ack: "ack" }, | |
| bash: { bash: "bash" }, | |
| buzz: { buzz: "buzz" }, | |
| }); |
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