types.ts
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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]
	};