Nested keyof

Hi all, I am trying to use a fancy type to get a nested keyof effect. I found this code snippet online:

type NestedKeyOf<ObjectType extends object> = {
  [Key in keyof ObjectType & (string | number)]: ObjectType[Key] extends object
    ? `${Key}.${NestedKeyOf<ObjectType[Key]>}`
    : `${Key}`;
}[keyof ObjectType & (string | number)];

type NestedKeyOf<ObjectType extends object> = {
  [Key in keyof ObjectType & (string | number)]: ObjectType[Key] extends object
    ? `${Key}.${NestedKeyOf<ObjectType[Key]>}`
    : `${Key}`;
}[keyof ObjectType & (string | number)];

and when using it on the declaration side it definitely works, but I am having trouble using it to index into the type. here's a link to the code snippet: https://www.typescriptlang.org/play?#code/C4TwDgpgBAchDOwIBMDSEQHkBmAeTARgFYQDGwAKuNBAB5IB2y8UA9sWcAHxQC8UAbwBQUKAG10IKAEsGUANYZW2KIRLkqkKADIoACkQAnWQHMoAHygMArgFsCEQwEoAugC5VHDdQkYXUOkZmNi9gEVEoAH4oAAMAEgFJAF8AOgS4RBRJHHxQzQhfEBcuJJjw0Q94xIxSgG4hJLFFEGVPdUpqHX0jUwsrOwdnF3qhUC0AMVZWPkFyqAIAQ0MPYQi1+YWALw8ehhM5pIAaOewpneBjPYahIVJWBkQFDA8MpDQMHMnWHn4AIkXDClFptfiM7g9gFBTqwPF8ZqsIgCVsCPP8tr8jiczlBftDfg0oAsWODEGD7o9DAhrAAbSH8aFNPy1IA

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1 Reply

ferdy•2y ago

ok looks like I can get what i want using lodash: https://lodash.com/docs/4.17.15#set (problem being that indexing into an object with a nested property can't be done like obj["a.b.c"]) gonna mark as solved

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Nested keyof