New Feature OBJECT_W_SELF, rewritten 'W' definition

packages/~feature-hub/dev/impl.js

@@ -72,7 +72,7 @@ export async function makeLib()
             'index.d.ts',
             'mask.d.ts',
             'mask-impl.d.ts',
-            'mask-impl-64.d.ts',
+            'mask-impl-52.d.ts',
             'mask-index.d.ts',
         ],
     );

packages/~feature-hub/src/mask-impl.ts

@@ -1,2 +1,2 @@
 export type { Mask }    from './mask';
-export *                from './mask-impl-64';
+export *                from './mask-impl-52';

readme.md

@@ -139,17 +139,16 @@ to support.
 In order to understand how this works, let's consider the JavaScript functions `atob` and `btoa`.
 Not all browsers support these functions: without any further information, JScrewIt will assume that
 they are unavailable and will not use them to encode the input.
-Anyway, if we know in advance that the browsers we plan to target do support `atob` and `btoa`
-indeed, we can let JScrewIt create code that uses those functions whenever that makes the output
-shorter.
+However, if we know in advance that the browsers we plan to target do support `atob` and `btoa`, we
+can let JScrewIt create code that uses those functions whenever that makes the output shorter.
 
 The way to tell JScrewIt to use a particular set of features is by specifying a value for the
 `features` option in the second parameter passed to `encode`.
 
-For instance, a generic `alert(1)` example for an unspecified environment is 1905 chracters long.
+For instance, a generic `alert(1)` example for an unspecified environment is 1903 chracters long.
 
 ```js
-const output = JScrewIt.encode("alert(1)"); // output is 1905 characters
+const output = JScrewIt.encode("alert(1)"); // output is 1903 characters
 ```
 
 We can save a few characters by indicating that our code is only supposed to run in a browser.
@@ -189,37 +188,35 @@ Most typically, it will throw some kind of error at runtime.
 
 It's important to keep in mind that each of the target engines needs to support every feature we
 specify.
-So if we want our JSFuck code to run in Android Browser 4.4, Safari 7.0 and Node.js 13+, we can only
+So if we want our JSFuck code to run in Android Browser 4.0, Safari 7.0 and Node.js 13+, we can only
 specify features supported by all of these engines.
 These features can be retrieved with
 [`JScrewIt.Feature.commonOf`](api-doc/interfaces/FeatureConstructor.md#commonof).
 
 ```js
-{ features: JScrewIt.Feature.commonOf("ANDRO_4_4", "NODE_13", "SAFARI_7_0") }
+{ features: JScrewIt.Feature.commonOf("ANDRO_4_0", "NODE_13", "SAFARI_7_0") }
 ```
 
 The features turn out to be
 [`ESC_HTML_QUOT`](api-doc/interfaces/FeatureAll.md#ESC_HTML_QUOT),
-[`GENERIC_ARRAY_TO_STRING`](api-doc/interfaces/FeatureAll.md#GENERIC_ARRAY_TO_STRING),
 [`GMT`](api-doc/interfaces/FeatureAll.md#GMT),
 [`INCR_CHAR`](api-doc/interfaces/FeatureAll.md#INCR_CHAR),
-[`NAME`](api-doc/interfaces/FeatureAll.md#NAME),
-[`NO_IE_SRC`](api-doc/interfaces/FeatureAll.md#NO_IE_SRC) and
-[`OBJECT_UNDEFINED`](api-doc/interfaces/FeatureAll.md#OBJECT_UNDEFINED) (a quick way to see this is
-entering `JScrewIt.Feature.commonOf("ANDRO_4_4", "NODE_13", "SAFARI_7_0").toString()` in the
-browser's console).
+[`NAME`](api-doc/interfaces/FeatureAll.md#NAME) and
+[`NO_IE_SRC`](api-doc/interfaces/FeatureAll.md#NO_IE_SRC) (a quick way to see this is entering
+`JScrewIt.Feature.commonOf("ANDRO_4_0", "NODE_13", "SAFARI_7_0").toString()` in the browser's
+console).
 With this knowledge, we could also rewrite the expression above as follows.
 
 ```js
-{ features: ["ESC_HTML_QUOT", "GMT", "INCR_CHAR", "NAME", "NO_IE_SRC", "OBJECT_UNDEFINED"] }
+{ features: ["ESC_HTML_QUOT", "GMT", "INCR_CHAR", "NAME", "NO_IE_SRC"] }
 ```
 
 Finally, note that simply specifying an array of engine features will not achieve the desired
 effect, as it will result in the union of the features available in every engine rather than in
 their intersection.
 
 ```diff
-- { features: ["ANDRO_4_4", "NODE_13", "SAFARI_7_0"] }
+- { features: ["ANDRO_4_0", "NODE_13", "SAFARI_7_0"] }
 ```
 
 ### Further Reading

src/lib/definitions.js

@@ -393,6 +393,7 @@ function getFHPaddingEntries(index)
     var OBJECT_ARRAY_ENTRIES_CTOR       = Feature.OBJECT_ARRAY_ENTRIES_CTOR;
     var OBJECT_L_LOCATION_CTOR          = Feature.OBJECT_L_LOCATION_CTOR;
     var OBJECT_UNDEFINED                = Feature.OBJECT_UNDEFINED;
+    var OBJECT_W_SELF                   = Feature.OBJECT_W_SELF;
     var OLD_SAFARI_LOCATION_CTOR        = Feature.OLD_SAFARI_LOCATION_CTOR;
     var PLAIN_INTL                      = Feature.PLAIN_INTL;
     var REGEXP_STRING_ITERATOR          = Feature.REGEXP_STRING_ITERATOR;
@@ -1067,7 +1068,7 @@ function getFHPaddingEntries(index)
             define('(self + RP_4_A)[SLICE_OR_SUBSTR]("-11")[0]', ANY_WINDOW),
             define('btoa(undefined)[1]', ATOB),
             define('(RP_0_S + self)[11]', DOMWINDOW),
-            define('(RP_3_WA + self)[11]', WINDOW),
+            define('(RP_3_WA + self)[11]', OBJECT_W_SELF),
             define('(self + RP_4_A).at("-11")', ANY_WINDOW, AT),
             defineCharDefault({ atob: false }),
         ],

src/lib/features.js

@@ -701,6 +701,19 @@ var featureInfos =
         },
         includes: ['UNDEFINED'],
     },
+    OBJECT_W_SELF:
+    {
+        description:
+        'The property that the string representation of the global object self starts ' +
+        'with "[object W".',
+        check:
+        function ()
+        {
+            var available = /^\[object W/.test(self);
+            return available;
+        },
+        attributes: { 'web-worker': 'non-ie-restriction' },
+    },
     OLD_SAFARI_LOCATION_CTOR:
     {
         description:
@@ -842,6 +855,7 @@ var featureInfos =
             'char-increment-restriction':   null,
             'safari-bug-21820506':          null,
             'web-worker-restriction':       null,
+            'non-ie-restriction':           null,
         },
     },
     COMPACT:
@@ -882,7 +896,12 @@ var featureInfos =
             'STATUS',
             'WINDOW',
         ],
-        attributes: { 'char-increment-restriction': null, 'web-worker-restriction': null },
+        attributes:
+        {
+            'char-increment-restriction': null,
+            'web-worker-restriction':     null,
+            'non-ie-restriction':         null,
+        },
     },
     ANDRO_4_0:
     {
@@ -927,7 +946,12 @@ var featureInfos =
             SHORT_LOCALES:          true,
             WINDOW:                 true,
         },
-        attributes: { 'no-console-in-web-worker': null, 'web-worker-restriction': null },
+        attributes:
+        {
+            'no-console-in-web-worker': null,
+            'web-worker-restriction':   null,
+            'non-ie-restriction':       null,
+        },
     },
     CHROME_PREV:
     {
@@ -977,7 +1001,12 @@ var featureInfos =
             'WINDOW',
         ],
         attributes:
-        { 'char-increment-restriction': null, 'unstable': null, 'web-worker-restriction': null },
+        {
+            'char-increment-restriction': null,
+            'unstable':                   null,
+            'web-worker-restriction':     null,
+            'non-ie-restriction':         null,
+        },
     },
     FF_ESR:
     {
@@ -1033,7 +1062,12 @@ var featureInfos =
             'WINDOW',
         ],
         attributes:
-        { 'char-increment-restriction': null, 'unstable': null, 'web-worker-restriction': null },
+        {
+            'char-increment-restriction': null,
+            'unstable':                   null,
+            'web-worker-restriction':     null,
+            'non-ie-restriction':         null,
+        },
     },
     IE_9:
     {
@@ -1217,6 +1251,7 @@ var featureInfos =
             'no-console-in-web-worker':     null,
             'old-safari-restriction':       null,
             'web-worker-restriction':       null,
+            'non-ie-restriction':           null,
         },
     },
     SAFARI_7_1:

test/helpers/feature-emulation.helpers.js

@@ -1152,6 +1152,7 @@
             if (toString() !== '[object Undefined]')
                 registerDefaultToStringAdapter(this, undefined, '[object Undefined]');
         },
+        OBJECT_W_SELF:                 makeEmuFeatureSelf('[object Window]', /^\[object Window]$/),
         OLD_SAFARI_LOCATION_CTOR:
         function ()
         {