I have array: const arr = ['foo', 'bar', 'bax'];
I want to create an object based on array entries:
const obj = {
foo: true,
bar: true,
bax: false,
fax: true, // typescript should show error here because "fax" is not in "arr"
};
How to tell typescript that all keys of obj must be inside arr?
You can do like this:
const arr = ['foo', 'bar', 'bax'] as const;
type MappedObject = Record<typeof arr[number], boolean>;
const obj: MappedObject = {
foo: true,
bar: true,
bax: false,
fax: true, // typescript should show error here because "fax" is not in "arr"
};
Related GitHub issue - Microsoft/TypeScript#28046
const arr = ['foo', 'bar', 'bax'];
//I want to create an object based on array entries:
const obj = {
foo: true,
bar: true,
bax: false,
fax: true, // typescript should show error here because "fax" is not in "arr"
};
for(const [key, value] of Object.entries(obj))
{
if(!arr.includes(key))
{
console.log(`error, ${key}: ${value} not found in array`)
}
}