![]() ![]() The current committee-approved snapshot of ECMA-262 is available in PDF and HTML format on Ecma International's ECMA-262 language specification page. ESNext features are more correctly called proposals, because, by definition, the specification has not been finalized yet. ESNext is a dynamic name that refers to whatever the next version is at the time of writing. After ES6, the specification is named by the publishing year - ES2017, ES2018, etc. All development is public on the Ecma TC39 GitHub organization, which hosts proposals, the official specification text, and meeting notes.īefore the 6th edition of ECMAScript (known as ES6), specifications were published once every several years, and are commonly referred by their major version numbers - ES3, ES5, etc. Warning: unreachable code after return statementĮCMAScript editions are approved and published as a standard by the ECMA General Assembly on a yearly basis.Warning: -file- is being assigned a //# sourceMappingURL, but already has one.TypeError: X.prototype.y called on incompatible type.TypeError: setting getter-only property "x".TypeError: Reduce of empty array with no initial value.TypeError: property "x" is non-configurable and can't be deleted.TypeError: invalid assignment to const "x".TypeError: invalid 'instanceof' operand 'x'.TypeError: cannot use 'in' operator to search for 'x' in 'y'.TypeError: can't redefine non-configurable property "x".TypeError: can't delete non-configurable array element.TypeError: can't define property "x": "obj" is not extensible.TypeError: can't convert BigInt to number.TypeError: can't assign to property "x" on "y": not an object.TypeError: "x" is not a non-null object.Synta圎rror: Using to indicate sourceURL pragmas is deprecated.Synta圎rror: unterminated string literal.Synta圎rror: unparenthesized unary expression can't appear on the left-hand side of '**'.Synta圎rror: unlabeled break must be inside loop or switch.Synta圎rror: Unexpected '#' used outside of class body.Synta圎rror: test for equality (=) mistyped as assignment (=)?.Synta圎rror: redeclaration of formal parameter "x".Synta圎rror: missing = in const declaration.Unicode character class escape: \p after property list.Character class escape: \d, \D, \w, \W, \s, \S.Enumerability and ownership of properties. ![]()
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