feat: scaffold doc comments

source/is-literal.d.ts

@@ -21,18 +21,74 @@ type LiteralChecks<T, LiteralUnionType> = (
  >
 );
 
+/**
+Returns a boolean for whether the given type is a `string` [literal type](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types).
+
+@example
+```
+import type {IsStringLiteral} from 'type-fest';
+
+```
+
+@category Utilities
+*/
 export type IsStringLiteral<T> = LiteralCheck<T, string>;
 
+/**
+Returns a boolean for whether the given type is a `number` or `bigint` [literal type](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types).
+
+@example
+```
+import type {IsNumericLiteral} from 'type-fest';
+
+```
+
+@category Utilities
+*/
 export type IsNumericLiteral<T> = LiteralChecks<T, Numeric>;
 
+/**
+Returns a boolean for whether the given type is a `true` or `false` [literal type](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types).
+
+@example
+```
+import type {IsBooleanLiteral} from 'type-fest';
+
+```
+
+@category Utilities
+*/
 export type IsBooleanLiteral<T> = LiteralCheck<T, boolean>;
 
+/**
+Returns a boolean for whether the given type is a `symbol` [literal type](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types).
+
+@example
+```
+import type {IsLiteral} from 'type-fest';
+
+```
+
+@category Utilities
+*/
 export type IsSymbolLiteral<T> = LiteralCheck<T, symbol>;
 
+/** Helper type for `IsLiteral`. */
 type IsLiteralUnion<T> =
  | IsStringLiteral<T>
  | IsNumericLiteral<T>
  | IsBooleanLiteral<T>
  | IsSymbolLiteral<T>;
 
+/**
+Returns a boolean for whether the given type is a [literal type](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types).
+
+@example
+```
+import type {IsLiteral} from 'type-fest';
+
+```
+
+@category Utilities
+*/
 export type IsLiteral<T extends Primitive> = IsNotFalse<IsLiteralUnion<T>>;