feat(core): add size.isUnresolved (#19569)

There is a `Duration.isUnresolved()`, and I'm adding a similar function for `Size`. 

See discussion here for why this is necessary: https://github.com/aws/aws-cdk/pull/19550/files#r835542214

The td:dr; is that `Token.isUnresolved()` does not check for the resolvability of object properties, so something like:

```ts
Token.isUnresolved(Size.mebibytes(Lazy.number({ produce: () => 10 }));
```

returns (to me, unexpectedly,) false.

----

### All Submissions:

* [x] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `cdk-integ` to deploy the infrastructure and generate the snapshot (i.e. `cdk-integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kaizencc

packages/@aws-cdk/core/lib/size.ts

@@ -144,6 +144,13 @@ export class Size {
   public toPebibytes(opts: SizeConversionOptions = {}): number {
     return convert(this.amount, this.unit, StorageUnit.Pebibytes, opts);
   }
+
+  /**
+   * Checks if size is a token or a resolvable object
+   */
+  public isUnresolved() {
+    return Token.isUnresolved(this.amount);
+  }
 }
 
 /**

packages/@aws-cdk/core/test/duration.test.ts

@@ -18,8 +18,6 @@ describe('duration', () => {
       () => stack.resolve(lazyDuration.toMinutes())).toThrow(
       /Unable to perform time unit conversion on un-resolved token/,
     );
-
-
   });
 
   test('Duration in seconds', () => {
@@ -31,8 +29,6 @@ describe('duration', () => {
     floatEqual(duration.toDays({ integral: false }), 300 / 86_400);
 
     expect(Duration.seconds(60 * 60 * 24).toDays()).toEqual(1);
-
-
   });
 
   test('Duration in minutes', () => {
@@ -44,8 +40,6 @@ describe('duration', () => {
     floatEqual(duration.toDays({ integral: false }), 300 / 86_400);
 
     expect(Duration.minutes(60 * 24).toDays()).toEqual(1);
-
-
   });
 
   test('Duration in hours', () => {
@@ -57,16 +51,12 @@ describe('duration', () => {
     floatEqual(duration.toDays({ integral: false }), 5 / 24);
 
     expect(Duration.hours(24).toDays()).toEqual(1);
-
-
   });
 
   test('seconds to milliseconds', () => {
     const duration = Duration.seconds(5);
 
     expect(duration.toMilliseconds()).toEqual(5_000);
-
-
   });
 
   test('Duration in days', () => {
@@ -75,8 +65,6 @@ describe('duration', () => {
     expect(duration.toSeconds()).toEqual(86_400);
     expect(duration.toMinutes()).toEqual(1_440);
     expect(duration.toDays()).toEqual(1);
-
-
   });
 
   testDeprecated('toISOString', () => {
@@ -93,8 +81,6 @@ describe('duration', () => {
     expect(Duration.days(5).toISOString()).toEqual('P5D');
 
     expect(Duration.seconds(1 + 60 * (1 + 60 * (1 + 24))).toISOString()).toEqual('P1DT1H1M1S');
-
-
   });
 
   test('toIsoString', () => {
@@ -112,8 +98,6 @@ describe('duration', () => {
 
     expect(Duration.seconds(65).toIsoString()).toEqual('PT1M5S');
     expect(Duration.seconds(1 + 60 * (1 + 60 * (1 + 24))).toIsoString()).toEqual('P1DT1H1M1S');
-
-
   });
 
   test('parse', () => {
@@ -128,8 +112,6 @@ describe('duration', () => {
     expect(Duration.parse('P5D').toSeconds()).toEqual(432_000);
 
     expect(Duration.parse('P1DT1H1M1S').toSeconds()).toEqual(1 + 60 * (1 + 60 * (1 + 24)));
-
-
   });
 
   test('reject illegal parses', () => {
@@ -141,8 +123,6 @@ describe('duration', () => {
     expect(() => {
       Duration.parse('P5S');
     }).toThrow(err);
-
-
   });
 
   test('to human string', () => {
@@ -165,8 +145,6 @@ describe('duration', () => {
     expect(Duration.millis(3666).toHumanString()).toEqual('3 seconds 666 millis');
 
     expect(Duration.millis(3.6).toHumanString()).toEqual('3.6 millis');
-
-
   });
 
   test('add two durations', () => {
@@ -188,7 +166,6 @@ describe('duration', () => {
     expect(Duration.millis(1).unitLabel()).toEqual('millis');
     expect(Duration.hours(1000).unitLabel()).toEqual('hours');
     expect(Duration.days(2).unitLabel()).toEqual('days');
-
   });
 
   test('format number token to number', () => {
@@ -197,14 +174,12 @@ describe('duration', () => {
     expect(stack.resolve(lazyDuration.formatTokenToNumber())).toEqual('10 minutes');
     expect(Duration.hours(10).formatTokenToNumber()).toEqual('10 hours');
     expect(Duration.days(5).formatTokenToNumber()).toEqual('5 days');
-
   });
 
   test('duration is unresolved', () => {
     const lazyDuration = Duration.minutes(Lazy.number({ produce: () => 10 }));
     expect(lazyDuration.isUnresolved()).toEqual(true);
     expect(Duration.hours(10).isUnresolved()).toEqual(false);
-
   });
 });
 

packages/@aws-cdk/core/test/size.test.ts

@@ -1,10 +1,8 @@
-import { Size, SizeRoundingBehavior, Stack, Token } from '../lib';
+import { Size, SizeRoundingBehavior, Stack, Token, Lazy } from '../lib';
 
 describe('size', () => {
   test('negative amount', () => {
     expect(() => Size.kibibytes(-1)).toThrow(/negative/);
-
-
   });
 
   test('unresolved amount', () => {
@@ -15,8 +13,6 @@ describe('size', () => {
       () => stack.resolve(lazySize.toMebibytes())).toThrow(
       /Unable to perform time unit conversion on un-resolved token/,
     );
-
-
   });
 
   test('Size in kibibytes', () => {
@@ -30,8 +26,6 @@ describe('size', () => {
     floatEqual(size.toPebibytes({ rounding: SizeRoundingBehavior.NONE }), 4_294_967_296 / (1024 * 1024 * 1024 * 1024));
 
     expect(Size.kibibytes(4 * 1024 * 1024).toGibibytes()).toEqual(4);
-
-
   });
 
   test('Size in mebibytes', () => {
@@ -45,8 +39,6 @@ describe('size', () => {
     floatEqual(size.toPebibytes({ rounding: SizeRoundingBehavior.NONE }), 4_194_304 / (1024 * 1024 * 1024));
 
     expect(Size.mebibytes(4 * 1024).toGibibytes()).toEqual(4);
-
-
   });
 
   test('Size in gibibyte', () => {
@@ -61,8 +53,6 @@ describe('size', () => {
     floatEqual(size.toPebibytes({ rounding: SizeRoundingBehavior.NONE }), 5 / (1024 * 1024));
 
     expect(Size.gibibytes(4096).toTebibytes()).toEqual(4);
-
-
   });
 
   test('Size in tebibyte', () => {
@@ -76,8 +66,6 @@ describe('size', () => {
     floatEqual(size.toPebibytes({ rounding: SizeRoundingBehavior.NONE }), 5 / 1024);
 
     expect(Size.tebibytes(4096).toPebibytes()).toEqual(4);
-
-
   });
 
   test('Size in pebibytes', () => {
@@ -88,8 +76,6 @@ describe('size', () => {
     expect(size.toGibibytes()).toEqual(5_242_880);
     expect(size.toTebibytes()).toEqual(5_120);
     expect(size.toPebibytes()).toEqual(5);
-
-
   });
 
   test('rounding behavior', () => {
@@ -105,8 +91,12 @@ describe('size', () => {
     expect(size.toGibibytes({ rounding: SizeRoundingBehavior.NONE })).toEqual(5.078125);
     expect(size.toTebibytes({ rounding: SizeRoundingBehavior.NONE })).toEqual(5200 / (1024 * 1024));
     expect(size.toKibibytes({ rounding: SizeRoundingBehavior.NONE })).toEqual(5_324_800);
+  });
 
-
+  test('size is unresolved', () => {
+    const lazySize = Size.pebibytes(Lazy.number({ produce: () => 10 }));
+    expect(lazySize.isUnresolved()).toEqual(true);
+    expect(Size.mebibytes(10).isUnresolved()).toEqual(false);
   });
 });