The website linked below discusses the compatibility of TypeScript 2.9 with well-defined JSON.
What exactly does "well-typed" JSON mean? As far as I understand, JSON supports 6 valid data types: string, number, object, array, boolean, and null. Therefore, every JSON data type should align well with TypeScript basic types. This is why the concept of being "well-typed" is confusing to me.
In contrast, what would be an example of "not-well-typed" JSON?
The concept is best illustrated by this example:
// ./src/settings.json
{
"dry": false,
"debug": false
}
// ./src/foo.ts
import settings from "./settings.json";
settings.debug === true; // This works fine
settings.dry === 2; // Error! You cannot compare a boolean with a number
One may assume that comparing settings.dry === 2 in JSON would not lead to any compilation errors, but it will actually fail at runtime.
TypeScript infers the types from the JSON properties and detects mismatches such as comparing a boolean to a number, which helps prevent logical errors during development.
This can be compared to using TypeScript like this:
const settings = {
dry: false,
debug: false
}
if (settings.dry === 2) { ... }
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