Add support for 4GB memory option

spec/function-builder.spec.ts

@@ -286,4 +286,16 @@ describe('FunctionBuilder', () => {
       });
     }).to.throw();
   });
+
+  it('should allow setting 4GB memory option', () => {
+    const fn = functions
+      .runWith({
+        memory: '4GB',
+      })
+      .region('europe-west1')
+      .auth.user()
+      .onCreate((user) => user);
+
+    expect(fn.__trigger.availableMemoryMb).to.deep.equal(4096);
+  });
 });

src/cloud-functions.ts

@@ -507,6 +507,7 @@ export function optionsToTrigger(options: DeploymentOptions) {
       '512MB': 512,
       '1GB': 1024,
       '2GB': 2048,
+      '4GB': 4096,
     };
     trigger.availableMemoryMb = _.get(memoryLookup, options.memory);
   }

src/function-builder.ts

@@ -144,7 +144,7 @@ export function region(
  * Configure runtime options for the function.
  * @param runtimeOptions Object with optional fields:
  * 1. `memory`: amount of memory to allocate to the function, possible values
- *    are: '128MB', '256MB', '512MB', '1GB', and '2GB'.
+ *    are: '128MB', '256MB', '512MB', '1GB', '2GB', and '4GB'.
  * 2. `timeoutSeconds`: timeout for the function in seconds, possible values are
  *    0 to 540.
  * 3. `failurePolicy`: failure policy of the function, with boolean `true` being
@@ -188,7 +188,7 @@ export class FunctionBuilder {
    * Configure runtime options for the function.
    * @param runtimeOptions Object with optional fields:
    * 1. `memory`: amount of memory to allocate to the function, possible values
-   *    are: '128MB', '256MB', '512MB', '1GB', and '2GB'.
+   *    are: '128MB', '256MB', '512MB', '1GB', '2GB', and '4GB'.
    * 2. `timeoutSeconds`: timeout for the function in seconds, possible values are
    *    0 to 540.
    * 3. `failurePolicy`: failure policy of the function, with boolean `true` being