Query:
Can you clarify the significance of the char at <:?
Where is the official documentation on this available?
How can I comprehend it better?
👇 meaning of this character
interface Literal <: Expression {
type: "Literal";
value: string | boolean | null | number | RegExp;
}
This isn't written in TypeScript. It seems to be interpreted as meaning "is a subtype of".
For instance, if we have
interface Literal <: ExpressionLiteral falls under the category of Expression. Similarly, interface Expression <: Node indicates that an Expression belongs to the type of Node. (In the abstract syntax tree, every element is categorized as some kind of Node)
If there are multiple identifiers on the right side, like:
interface FunctionExpression <: Function, Expression
this implies that the left part represents a relationship with both types (for example, a FunctionExpression is considered both a Function node and an Expression node).
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