Add various JavaScript features

features/exponentiation.yml

@@ -0,0 +1,8 @@
+name: Exponentiation operator
+description: The exponentiation (`**`) operator returns the result of raising the first operand to the power of the second operand.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#sec-exp-operator
+group: javascript
+snapshot: ecmascript-2016
+compat_features:
+  - javascript.operators.exponentiation
+  - javascript.operators.exponentiation_assignment

features/exponentiation.yml.dist

@@ -0,0 +1,18 @@
+# Generated from: exponentiation.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2017-03-27
+  baseline_high_date: 2019-09-27
+  support:
+    chrome: "52"
+    chrome_android: "52"
+    edge: "14"
+    firefox: "52"
+    firefox_android: "52"
+    safari: "10.1"
+    safari_ios: "10.3"
+compat_features:
+  - javascript.operators.exponentiation
+  - javascript.operators.exponentiation_assignment

features/functions.yml

@@ -44,3 +44,4 @@ compat_features:
   - javascript.operators.function.trailing_comma
   - javascript.statements.function
   - javascript.statements.function.trailing_comma_in_parameters
+  - javascript.grammar.trailing_commas.trailing_commas_in_functions

features/functions.yml.dist

@@ -298,6 +298,7 @@ compat_features:
   #   firefox_android: "52"
   #   safari: "10"
   #   safari_ios: "10"
+  - javascript.grammar.trailing_commas.trailing_commas_in_functions
   - javascript.operators.function.trailing_comma
   - javascript.statements.function.trailing_comma_in_parameters
 

features/globalthis.yml

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+name: globalThis
+description: The `globalThis` property accesses the global `this` value (and hence the global object itself) across environments.
+spec: https://tc39.es/ecma262/multipage/global-object.html#sec-globalthis
+snapshot: ecmascript-2020
+group: javascript
+compat_features:
+  - javascript.builtins.globalThis

features/globalthis.yml.dist

@@ -0,0 +1,17 @@
+# Generated from: globalthis.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-01-15
+  baseline_high_date: 2022-07-15
+  support:
+    chrome: "71"
+    chrome_android: "71"
+    edge: "79"
+    firefox: "65"
+    firefox_android: "65"
+    safari: "12.1"
+    safari_ios: "12.2"
+compat_features:
+  - javascript.builtins.globalThis

features/hashbang-comments.yml

@@ -0,0 +1,7 @@
+name: Hashbang comments
+description: The `#!` comment at the absolute start of a script or module is treated as a normal comment and is ignored by the JavaScript engine.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-lexical-grammar.html#sec-hashbang
+snapshot: ecmascript-2023
+group: javascript
+compat_features:
+  - javascript.grammar.hashbang_comments

features/hashbang-comments.yml.dist

@@ -0,0 +1,17 @@
+# Generated from: hashbang-comments.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-03-24
+  baseline_high_date: 2022-09-24
+  support:
+    chrome: "74"
+    chrome_android: "74"
+    edge: "79"
+    firefox: "67"
+    firefox_android: "67"
+    safari: "13.1"
+    safari_ios: "13.4"
+compat_features:
+  - javascript.grammar.hashbang_comments

features/let-const.yml

@@ -0,0 +1,11 @@
+name: Let and const
+description: The `let` and `const` declarations define block-scoped variables.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarations
+caniuse:
+  - let
+  - const
+group: javascript
+snapshot: ecmascript-2015
+compat_features:
+  - javascript.statements.const
+  - javascript.statements.let

features/let-const.yml.dist

@@ -0,0 +1,42 @@
+# Generated from: let-const.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2016-09-20
+  baseline_high_date: 2019-03-20
+  support:
+    chrome: "49"
+    chrome_android: "49"
+    edge: "14"
+    firefox: "44"
+    firefox_android: "44"
+    safari: "10"
+    safari_ios: "10"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "21"
+  #   chrome_android: "25"
+  #   edge: "12"
+  #   firefox: "36"
+  #   firefox_android: "36"
+  #   safari: "5.1"
+  #   safari_ios: "5"
+  - javascript.statements.const
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2016-09-20
+  # baseline_high_date: 2019-03-20
+  # support:
+  #   chrome: "49"
+  #   chrome_android: "49"
+  #   edge: "14"
+  #   firefox: "44"
+  #   firefox_android: "44"
+  #   safari: "10"
+  #   safari_ios: "10"
+  - javascript.statements.let

features/logical-assignments.yml

@@ -0,0 +1,7 @@
+name: Logical assignments
+description: The logical AND assignment (`&&=`) and the logical OR assignment (`||=`) operators short-circuit the respective binary logical operators.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#sec-assignment-operators
+group: javascript
+compat_features:
+  - javascript.operators.logical_and_assignment
+  - javascript.operators.logical_or_assignment

features/logical-assignments.yml.dist

@@ -0,0 +1,18 @@
+# Generated from: logical-assignments.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-09-16
+  baseline_high_date: 2023-03-16
+  support:
+    chrome: "85"
+    chrome_android: "85"
+    edge: "85"
+    firefox: "79"
+    firefox_android: "79"
+    safari: "14"
+    safari_ios: "14"
+compat_features:
+  - javascript.operators.logical_and_assignment
+  - javascript.operators.logical_or_assignment

features/nullish-coalescing.yml

@@ -0,0 +1,8 @@
+name: Nullish coalescing
+description: The nullish coalescing (`??`) and nullish coalescing assignment (`??=`) operators return (or assign) its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#prod-CoalesceExpression
+snapshot: ecmascript-2020
+group: javascript
+compat_features:
+  - javascript.operators.nullish_coalescing
+  - javascript.operators.nullish_coalescing_assignment

features/nullish-coalescing.yml.dist

@@ -0,0 +1,42 @@
+# Generated from: nullish-coalescing.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-09-16
+  baseline_high_date: 2023-03-16
+  support:
+    chrome: "85"
+    chrome_android: "85"
+    edge: "85"
+    firefox: "79"
+    firefox_android: "79"
+    safari: "14"
+    safari_ios: "14"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2020-07-28
+  # baseline_high_date: 2023-01-28
+  # support:
+  #   chrome: "80"
+  #   chrome_android: "80"
+  #   edge: "80"
+  #   firefox: "72"
+  #   firefox_android: "79"
+  #   safari: "13.1"
+  #   safari_ios: "13.4"
+  - javascript.operators.nullish_coalescing
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2020-09-16
+  # baseline_high_date: 2023-03-16
+  # support:
+  #   chrome: "85"
+  #   chrome_android: "85"
+  #   edge: "85"
+  #   firefox: "79"
+  #   firefox_android: "79"
+  #   safari: "14"
+  #   safari_ios: "14"
+  - javascript.operators.nullish_coalescing_assignment

features/numeric-seperators.yml

@@ -0,0 +1,6 @@
+name: Numeric separators
+description: To improve readability for numeric literals, underscores (`_`) can be used as separators. For example, `1_050.95` is equivalent to `1050.95`.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-lexical-grammar.html#prod-NumericLiteralSeparator
+group: javascript
+compat_features:
+  - javascript.grammar.numeric_separators

features/numeric-seperators.yml.dist

@@ -0,0 +1,17 @@
+# Generated from: numeric-seperators.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-07-28
+  baseline_high_date: 2023-01-28
+  support:
+    chrome: "75"
+    chrome_android: "75"
+    edge: "79"
+    firefox: "70"
+    firefox_android: "79"
+    safari: "13"
+    safari_ios: "13"
+compat_features:
+  - javascript.grammar.numeric_separators

features/optional-catch-binding.yml

@@ -0,0 +1,7 @@
+name: Optional catch binding
+description: Omit the the binding parameter of a `catch` clause when you don't need information about the exception in a `try ... catch` statement.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-try-statement
+group: javascript
+snapshot: ecmascript-2019
+compat_features:
+  - javascript.statements.try_catch.optional_catch_binding

features/optional-catch-binding.yml.dist

@@ -0,0 +1,17 @@
+# Generated from: optional-catch-binding.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-01-15
+  baseline_high_date: 2022-07-15
+  support:
+    chrome: "66"
+    chrome_android: "66"
+    edge: "79"
+    firefox: "58"
+    firefox_android: "58"
+    safari: "11.1"
+    safari_ios: "11.3"
+compat_features:
+  - javascript.statements.try_catch.optional_catch_binding

features/template-literals.yml

@@ -0,0 +1,7 @@
+name: Template literals
+description: Template literals are literals delimited with backtick (<code>`</code>) characters, allowing for multi-line strings, string interpolation with embedded expressions, and special constructs called tagged templates.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#sec-template-literals
+group: javascript
+compat_features:
+  - javascript.grammar.template_literals
+  - javascript.grammar.template_literals.template_literal_revision

features/template-literals.yml.dist

@@ -0,0 +1,42 @@
+# Generated from: template-literals.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-01-15
+  baseline_high_date: 2022-07-15
+  support:
+    chrome: "62"
+    chrome_android: "62"
+    edge: "79"
+    firefox: "53"
+    firefox_android: "53"
+    safari: "11"
+    safari_ios: "11"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2015-09-30
+  # baseline_high_date: 2018-03-30
+  # support:
+  #   chrome: "41"
+  #   chrome_android: "41"
+  #   edge: "12"
+  #   firefox: "34"
+  #   firefox_android: "34"
+  #   safari: "9"
+  #   safari_ios: "9"
+  - javascript.grammar.template_literals
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2020-01-15
+  # baseline_high_date: 2022-07-15
+  # support:
+  #   chrome: "62"
+  #   chrome_android: "62"
+  #   edge: "79"
+  #   firefox: "53"
+  #   firefox_android: "53"
+  #   safari: "11"
+  #   safari_ios: "11"
+  - javascript.grammar.template_literals.template_literal_revision

features/top-level-await.yml

@@ -0,0 +1,6 @@
+name: Top-level await
+description: The `await` keyword, when used at the top level of a module (outside of an async function), delays parent module execution until after a promise fulfills.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-functions-and-classes.html#sec-async-function-definitions
+group: javascript
+compat_features:
+  - javascript.operators.await.top_level

features/top-level-await.yml.dist

@@ -0,0 +1,17 @@
+# Generated from: top-level-await.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2021-09-20
+  baseline_high_date: 2024-03-20
+  support:
+    chrome: "89"
+    chrome_android: "89"
+    edge: "89"
+    firefox: "89"
+    firefox_android: "89"
+    safari: "15"
+    safari_ios: "15"
+compat_features:
+  - javascript.operators.await.top_level

features/unicode-point-escapes.yml

@@ -0,0 +1,7 @@
+name: Unicode point escapes
+description: Unicode point escapes (`\\u{}`) represent Unicode characters within strings.
+spec: https://tc39.es/ecma262/multipage/ecmascript-language-lexical-grammar.html#prod-UnicodeEscapeSequence
+snapshot: ecmascript-2015
+group: javascript
+compat_features:
+  - javascript.grammar.unicode_point_escapes

features/unicode-point-escapes.yml.dist

@@ -0,0 +1,17 @@
+# Generated from: unicode-point-escapes.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-09-30
+  baseline_high_date: 2018-03-30
+  support:
+    chrome: "44"
+    chrome_android: "44"
+    edge: "12"
+    firefox: "40"
+    firefox_android: "40"
+    safari: "9"
+    safari_ios: "9"
+compat_features:
+  - javascript.grammar.unicode_point_escapes