Is it possible to create a new type alias based on an object's values?
const test = {
'a': ['music','bbq','shopping'],
'b': ['move','work']
};
How can we extract this information from the 'test' object?
type Types = 'music' | 'bbq' | 'shopping' | 'move' | 'work'
If you want to achieve this task effortlessly, you can utilize the as const keyword:
const test = {
'a': ['music','bbq','shopping'],
'b': ['move','work']
} as const;
type Items = typeof test[keyof typeof test][number];
An alternative approach, albeit a bit more verbose, is to create an interface with the precise elements of the arrays:
interface Bar {
a: ['music', 'bbq', 'shopping'],
b: ['move', 'work']
};
type Items2 = Bar[keyof Bar][number];
let activities = {
'x': ['hiking','camping','reading'] as const,
'y': ['travel','sleep'] as const
};
type Hobbies = activities.x[number] | activities.y[number]
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