Is it possible to define a type in TypeScript that is between 0 and 1, or any other integer values?
For example:
interface Config {
opacity: 0.5 // example value
}
Is it possible to define a type in TypeScript that is between 0 and 1, or any other integer values?
For example:
interface Config {
opacity: 0.5 // example value
}
It doesn't seem feasible, but there is a workaround. If you are looking for specific numbers, try the following approach:
type Transparency = 0|0.1|0.2|0.3|0.4|0.5|0.6|0.7|0.8|0.9|1;
let myTransparency:Transparency = 0.5;
To ensure the number stays within range, create a wrapper class that can handle potential errors:
class Transparency {
readonly value: number;
constructor(value: number) {
if(value < 0 || value > 1) {
throw new Error("Value out of bounds");
}
this.value = value;
}
}
var valid = new Transparency(0.7);
var invalid = new Transparency(1.5); // throws an error
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