Merge pull request #48 from wcho21/dev

support better error handling

package.json

@@ -10,6 +10,7 @@
   ],
   "devDependencies": {
     "@types/jest": "^29.5.10",
+    "@types/node": "^20.11.6",
     "jest": "^29.7.0",
     "ts-jest": "^29.1.1",
     "typescript": "^5.3.2",

src/evaluator/environment/index.test.ts

@@ -1,11 +1,11 @@
-import type { Evaluated } from "../evaluated";
+import type { Value } from "../value";
 import Environment from "./";
 
 describe("set()", () => {
   it("set name and value", () => {
     const env = new Environment();
     const varName = "foo";
-    const varValue = {} as Evaluated;
+    const varValue = {} as Value;
 
     expect(() => env.set(varName, varValue)).not.toThrow();
   });
@@ -15,7 +15,7 @@ describe("get()", () => {
   it("get value after setting the value", () => {
     const env = new Environment();
     const varName = "foo";
-    const varValue = {} as Evaluated;
+    const varValue = {} as Value;
 
     env.set(varName, varValue);
 
@@ -33,7 +33,7 @@ describe("get()", () => {
 describe("linked environment", () => {
   it("set super environment and get via sub environment", () => {
     const varNameInSuper = "foo";
-    const varValueInSuper = {} as Evaluated;
+    const varValueInSuper = {} as Value;
 
     const superEnv = new Environment();
     superEnv.set(varNameInSuper, varValueInSuper);

src/evaluator/environment/index.ts

@@ -1,8 +1,8 @@
-import type { Evaluated } from "../evaluated";
+import type { Value } from "../value";
 
 export interface EnvironmentType {
-  get: (name: string) => Evaluated | null;
-  set: (name: string, value: Evaluated) => void;
+  get: (name: string) => Value | null;
+  set: (name: string, value: Value) => void;
 }
 
 export default class Environment implements EnvironmentType {
@@ -14,7 +14,7 @@ export default class Environment implements EnvironmentType {
     this.table = new Map<string, any>;
   }
 
-  get(name: string): Evaluated | null {
+  get(name: string): Value | null {
     // return if found in current environment
     const fetched = this.table.get(name);
     if (fetched !== undefined) {
@@ -28,7 +28,7 @@ export default class Environment implements EnvironmentType {
     return this.superEnvironment.get(name);
   }
 
-  set(name: string, value: Evaluated): void {
+  set(name: string, value: Value): void {
     this.table.set(name, value);
   }
 }