Recently, I decided to switch my file name from index.js to index.ts. Here's an example of the issue I'm facing:
let response = "none"
let condition = true
if(condition){
response = {id: 123 , data: []}
}
console.log(response)
However, I'm encountering a syntax error that says {id: 123 , data: []} is not assignable to type string. This situation is quite frustrating as I have a significant amount of code (over 5k lines) and I'm hesitant to modify all the variables.
To make the most out of typescript, it's important to define the types for your properties and methods.
For instance, in the scenario provided, the variable response can have two possible forms:
We need to communicate this to typescript as follows:
type ResponseObject = { id: number, data: any[] }
let response: "none" | ResponseObject = "none"
let condition = true
if(condition){
// There will be no issues, as typescript now recognizes this specific data type
response = {id: 123 , data: []}
}
console.log(response)
consider using the any data type
let result : any = "none"
although, it may result in losing some autocomplete suggestions
alternatively, you can also try this approach
let result : (string | {id: Number , data: Array<any>} }= "none"
and benefit from TypeScript's suggestions for these specific types.
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