Add a "JavaScript core (initial support)" feature

features/javascript.yml

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+name: JavaScript (initial core language support)
+description: JavaScript is a programming language that runs in browsers, usually through the `<script>` element. JavaScript has changed over many years. This feature represents the oldest language features, such as built-in objects, statements, and operators. Also known as ECMAScript.
+spec: https://tc39.es/ecma262/multipage/#sec-intro
+group: javascript
+compat_features:
+  - javascript.builtins.Boolean
+  - javascript.builtins.Boolean.Boolean
+  - javascript.builtins.Boolean.toString
+  - javascript.builtins.Boolean.valueOf
+  - javascript.builtins.Error
+  - javascript.builtins.Error.Error
+  - javascript.builtins.Error.message
+  - javascript.builtins.Error.name
+  - javascript.builtins.Error.toString
+  - javascript.builtins.EvalError
+  - javascript.builtins.EvalError.EvalError
+  - javascript.builtins.RangeError
+  - javascript.builtins.RangeError.RangeError
+  - javascript.builtins.ReferenceError
+  - javascript.builtins.ReferenceError.ReferenceError
+  - javascript.builtins.SyntaxError
+  - javascript.builtins.SyntaxError.SyntaxError
+  - javascript.builtins.TypeError
+  - javascript.builtins.TypeError.TypeError
+  - javascript.builtins.URIError
+  - javascript.builtins.URIError.URIError
+  - javascript.builtins.decodeURI
+  - javascript.builtins.decodeURIComponent
+  - javascript.builtins.encodeURI
+  - javascript.builtins.encodeURIComponent
+  - javascript.builtins.eval
+  - javascript.builtins.isFinite
+  - javascript.builtins.parseFloat
+  - javascript.builtins.undefined
+  - javascript.grammar.boolean_literals
+  - javascript.grammar.null_literal
+  - javascript.operators.addition
+  - javascript.operators.addition_assignment
+  - javascript.operators.assignment
+  - javascript.operators.bitwise_and
+  - javascript.operators.bitwise_and_assignment
+  - javascript.operators.bitwise_not
+  - javascript.operators.bitwise_or
+  - javascript.operators.bitwise_or_assignment
+  - javascript.operators.bitwise_xor
+  - javascript.operators.bitwise_xor_assignment
+  - javascript.operators.comma
+  - javascript.operators.conditional
+  - javascript.operators.decrement
+  - javascript.operators.delete
+  - javascript.operators.division
+  - javascript.operators.division_assignment
+  - javascript.operators.equality
+  - javascript.operators.greater_than
+  - javascript.operators.greater_than_or_equal
+  - javascript.operators.grouping
+  - javascript.operators.in
+  - javascript.operators.increment
+  - javascript.operators.inequality
+  - javascript.operators.instanceof
+  - javascript.operators.left_shift
+  - javascript.operators.left_shift_assignment
+  - javascript.operators.less_than
+  - javascript.operators.less_than_or_equal
+  - javascript.operators.logical_and
+  - javascript.operators.logical_not
+  - javascript.operators.logical_or
+  - javascript.operators.multiplication
+  - javascript.operators.multiplication_assignment
+  - javascript.operators.new
+  - javascript.operators.null
+  - javascript.operators.property_accessors
+  - javascript.operators.remainder
+  - javascript.operators.remainder_assignment
+  - javascript.operators.right_shift
+  - javascript.operators.right_shift_assignment
+  - javascript.operators.strict_equality
+  - javascript.operators.strict_inequality
+  - javascript.operators.subtraction
+  - javascript.operators.subtraction_assignment
+  - javascript.operators.this
+  - javascript.operators.typeof
+  - javascript.operators.unary_negation
+  - javascript.operators.unary_plus
+  - javascript.operators.unsigned_right_shift
+  - javascript.operators.unsigned_right_shift_assignment
+  - javascript.operators.void
+  - javascript.statements.block
+  - javascript.statements.break
+  - javascript.statements.continue
+  - javascript.statements.debugger
+  - javascript.statements.do_while
+  - javascript.statements.empty
+  - javascript.statements.for
+  - javascript.statements.for_in
+  - javascript.statements.if_else
+  - javascript.statements.label
+  - javascript.statements.return
+  - javascript.statements.switch
+  - javascript.statements.throw
+  - javascript.statements.try_catch
+  - javascript.statements.var
+  - javascript.statements.while

features/javascript.yml.dist

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+# Generated from: javascript.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "5"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "5"
+    safari_ios: "4.2"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1"
+  #   safari_ios: "1"
+  - javascript.builtins.Boolean
+  - javascript.builtins.Boolean.Boolean
+  - javascript.builtins.Boolean.toString
+  - javascript.builtins.Boolean.valueOf
+  - javascript.builtins.Error
+  - javascript.builtins.Error.Error
+  - javascript.builtins.Error.message
+  - javascript.builtins.Error.name
+  - javascript.builtins.Error.toString
+  - javascript.builtins.EvalError
+  - javascript.builtins.EvalError.EvalError
+  - javascript.builtins.RangeError
+  - javascript.builtins.RangeError.RangeError
+  - javascript.builtins.ReferenceError
+  - javascript.builtins.ReferenceError.ReferenceError
+  - javascript.builtins.SyntaxError
+  - javascript.builtins.SyntaxError.SyntaxError
+  - javascript.builtins.TypeError
+  - javascript.builtins.TypeError.TypeError
+  - javascript.builtins.URIError
+  - javascript.builtins.URIError.URIError
+  - javascript.builtins.eval
+  - javascript.builtins.isFinite
+  - javascript.builtins.parseFloat
+  - javascript.builtins.undefined
+  - javascript.grammar.boolean_literals
+  - javascript.grammar.null_literal
+  - javascript.operators.addition
+  - javascript.operators.addition_assignment
+  - javascript.operators.assignment
+  - javascript.operators.bitwise_and
+  - javascript.operators.bitwise_and_assignment
+  - javascript.operators.bitwise_not
+  - javascript.operators.bitwise_or
+  - javascript.operators.bitwise_or_assignment
+  - javascript.operators.bitwise_xor
+  - javascript.operators.bitwise_xor_assignment
+  - javascript.operators.comma
+  - javascript.operators.conditional
+  - javascript.operators.delete
+  - javascript.operators.division
+  - javascript.operators.division_assignment
+  - javascript.operators.equality
+  - javascript.operators.greater_than
+  - javascript.operators.greater_than_or_equal
+  - javascript.operators.grouping
+  - javascript.operators.in
+  - javascript.operators.inequality
+  - javascript.operators.instanceof
+  - javascript.operators.left_shift
+  - javascript.operators.left_shift_assignment
+  - javascript.operators.less_than
+  - javascript.operators.less_than_or_equal
+  - javascript.operators.logical_and
+  - javascript.operators.logical_not
+  - javascript.operators.logical_or
+  - javascript.operators.multiplication
+  - javascript.operators.multiplication_assignment
+  - javascript.operators.new
+  - javascript.operators.null
+  - javascript.operators.property_accessors
+  - javascript.operators.remainder
+  - javascript.operators.remainder_assignment
+  - javascript.operators.right_shift
+  - javascript.operators.right_shift_assignment
+  - javascript.operators.strict_equality
+  - javascript.operators.strict_inequality
+  - javascript.operators.subtraction
+  - javascript.operators.subtraction_assignment
+  - javascript.operators.this
+  - javascript.operators.typeof
+  - javascript.operators.unary_negation
+  - javascript.operators.unary_plus
+  - javascript.operators.unsigned_right_shift
+  - javascript.operators.unsigned_right_shift_assignment
+  - javascript.statements.block
+  - javascript.statements.break
+  - javascript.statements.continue
+  - javascript.statements.do_while
+  - javascript.statements.for
+  - javascript.statements.for_in
+  - javascript.statements.if_else
+  - javascript.statements.label
+  - javascript.statements.return
+  - javascript.statements.switch
+  - javascript.statements.throw
+  - javascript.statements.try_catch
+  - javascript.statements.var
+  - javascript.statements.while
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "1.1"
+  #   safari_ios: "1"
+  - javascript.builtins.decodeURI
+  - javascript.builtins.decodeURIComponent
+  - javascript.builtins.encodeURI
+  - javascript.builtins.encodeURIComponent
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "1"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "3.1"
+  #   safari_ios: "3"
+  - javascript.operators.void
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "2"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "4"
+  #   safari_ios: "3.2"
+  - javascript.operators.decrement
+  - javascript.operators.increment
+
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "3"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "5"
+  #   safari_ios: "4.2"
+  - javascript.statements.empty
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2015-07-29
+  # baseline_high_date: 2018-01-29
+  # support:
+  #   chrome: "5"
+  #   chrome_android: "18"
+  #   edge: "12"
+  #   firefox: "1"
+  #   firefox_android: "4"
+  #   safari: "5"
+  #   safari_ios: "4.2"
+  - javascript.statements.debugger