Is there a way to create a unified union type based on the dynamic properties of an object?
const config = {
devices: {
Brand1: ['model1'],
Brand2: ['model2', 'model3'],
},
};
export type DeviceBrand = keyof typeof config.devices; // 'Brand1' | 'Brand2'
export type DeviceModel = ___________; // 'model1' | 'model2' | 'model3'
How can I transform DeviceModel into a union type that includes all models from the brands in the object?
Here is the solution:
const deviceConfig = {
devices: {
Brand1: ['model1'],
Brand2: ['model2', 'model3'],
},
} as const;
export type DeviceBrand = keyof typeof deviceConfig.devices; // 'Brand1' | 'Brand2'
export type DeviceModel = typeof deviceConfig['devices'][DeviceBrand][number]; // 'model1' | 'model2' | 'model3'
const a: DeviceModel = 'model1' // valid
const b: DeviceModel = 'model4' // type error
Make sure to utilize the const assertion for the deviceConfig variable to narrow down the type to specific string values
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