The deno TypeScript compiler output for env.ts

env.js

// Plucked from the output of: deno bundle impls/ts/step3_env.ts
class Env {
    outer;
    data;
    constructor(outer){
        this.outer = outer ?? null;
        this.data = {};
    }
    set(k, v) {
        this.data[k.value] = v;
        return v;
    }
    find(k) {
        if (k.value in this.data) return this;
        else if (this.outer) return this.outer.find(k);
        else return null;
    }
    get(k) {
        const env = this.find(k);
        if (env !== null) return env.data[k.value];
        else throw `The symbol '${k.value}' not found in the environment`;
    }
}