I am using type script and I want to make a type that represents an object like this the keys generated are genrated dynamically how do I do that
{ dog:true,
cat:true,
x:true
}
currently I am just using any but I woud like a proper type
const matches: any= {}
i get this error when i try to use
{[key: string]: boolean}
Type 'string[] | { [key: string]: boolean; }' must have a '[Symbol.iterator]()' method that returns an iterato
code that causes this error
const docgetter=()=>
const matches: { [key: string]: boolean } = {}
const documentFieldKeys = Array.isArray(documentNames) ? documentNames : Object.keys(documentNames)
return [matches, documentFieldKeys]
}
const [matches,kycKeys]=docgetter()
for(key of kycKeys)
Using [key : string]
type dict = {
[key : string] : boolean
}
const o: dict = {
cat: true,
dog: true,
x: false
}
Edit:
you didn't specify a type for the output of docgetter so typescript inferred it incorrectly as
const kycKeys: {
[key: string]: boolean;
} | string[]
You could either fix this by doing
for(const key of kycKeys as string[]) {
console.log(key)
}
to let typescript know you are iterating an array and not an object (object would error)
Or you could let typescript know what the output is
fixed version of your code:
const documentNames = {
"a": true,
"b": true,
"c": true
}
type output = [
{ [key: string]: boolean },
string[]
]
const docgetter=() : output => {
const matches: { [key: string]: boolean } = {}
const documentFieldKeys : string[] = Array.isArray(documentNames) ? documentNames : Object.keys(documentNames)
return [matches, documentFieldKeys]
}
const [matches,kycKeys]=docgetter()
for(const key of kycKeys) {
console.log(key)
}