Turn Env into a class, and add ReadOnlyEnv

lib/entry-points.js

@@ -141483,15 +141483,32 @@ function getOptionalEnvVarFrom(env, paramName) {
 function getOptionalEnvVar(paramName) {
   return getOptionalEnvVarFrom(process.env, paramName);
 }
+var ReadOnlyEnv = class {
+  constructor(vars) {
+    this.vars = vars;
+  }
+  vars;
+  /** Tries to get the value for `name` and throws if there isn't one. */
+  getRequired(name) {
+    return getRequiredEnvVar(this.vars, name);
+  }
+  /** Gets the value for `name`, or `undefined` if it isn't set or empty. */
+  getOptional(name) {
+    return getOptionalEnvVarFrom(this.vars, name);
+  }
+  /** Gets the entries of the underlying `ProcessEnv`. */
+  entries() {
+    return Object.entries(this.vars);
+  }
+};
+var Env = class extends ReadOnlyEnv {
+  /** Sets an environment variable. */
+  set(name, value) {
+    this.vars[name] = value;
+  }
+};
 function getEnv(env = process.env) {
-  return {
-    getRequired: (name) => getRequiredEnvVar(env, name),
-    getOptional: (name) => getOptionalEnvVarFrom(env, name),
-    entries: () => Object.entries(env),
-    set: (name, value) => {
-      env[name] = value;
-    }
-  };
+  return new Env(env);
 }
 
 // src/util.ts
@@ -145613,15 +145630,15 @@ function createApiClientWithDetails(apiDetails, { allowExternal = false } = {})
     })
   );
 }
-function getApiDetails() {
+function getApiDetails(env = getEnv()) {
   return {
     auth: getRequiredInput("token"),
-    url: getRequiredEnvParam("GITHUB_SERVER_URL" /* GITHUB_SERVER_URL */),
-    apiURL: getRequiredEnvParam("GITHUB_API_URL" /* GITHUB_API_URL */)
+    url: env.getRequired("GITHUB_SERVER_URL" /* GITHUB_SERVER_URL */),
+    apiURL: env.getRequired("GITHUB_API_URL" /* GITHUB_API_URL */)
   };
 }
-function getApiClient() {
-  return createApiClientWithDetails(getApiDetails());
+function getApiClient(env = getEnv()) {
+  return createApiClientWithDetails(getApiDetails(env));
 }
 function getApiClientWithExternalAuth(apiDetails) {
   return createApiClientWithDetails(apiDetails, { allowExternal: true });