inline-method

types.ts
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			export enum LispNode {
			APPLY,
			WORD,
			ATOM,
			STRING
			}

			export type Env = Record<string, LispValue>;
			export type Leaf = [LispNode, string \| number];
			export type Expr = Leaf \| Expr[];

			export type LispValue = number \| string \| LispValue[] \| LispFn;
			export type LispFn = (args: Expr[], env: Env) => LispValue;

			export const Leaf = {
			apply: (value: string): Leaf => [LispNode.APPLY, value],
			word: (value: string): Leaf => [LispNode.WORD, value],
			atom: (value: number): Leaf => [LispNode.ATOM, value],
			string: (value: string): Leaf => [LispNode.STRING, value]
			};