ECMAScript Support

ecmascript.md

ECMAScript Support (as of October 29, 2022)

Global support of es2023 since:

• Chrome v97 (January 4, 2022)
• Edge v97 (December 1, 2021)
• Safari v15.4 (March 14, 2022)
• Safari on iOS v15.4 (March 14, 2022)
• Opera v83 (January 19, 2022)
• Firefox v104 (June 23, 2022)
• Samsung Browser v18 (August 8, 2022)
• Chrome for Android v97 (January 11, 2022)
• Firefox for Android v105 (September 20, 2022)

Other browsers are not supported (Internet Explorer, non-chromium Edge, Opera Mini, Opera Mobile, ...).

The supported browsers represent 88.3% of the global browser usage when excluding the following features:

• Build-in error cause (not supported by Opera)
  • https://caniuse.com/mdn-javascript_builtins_error_cause
• Static initialization blocks (not supported by Safari and Safari on iOS)
  • https://caniuse.com/mdn-javascript_classes_static_initialization_blocks
• Function.toString revision (not supported by Safari and Safari on iOS)
  • https://caniuse.com/mdn-javascript_builtins_function_tostring_tostring_revision

Or 73.6% when including them.

Least supported features usage

In addition to the 3 previous features (which are barely used anyway), here are some other features, which are more commonly used but are not yet widely adopted (supported by less than 92% of browser usage).

• Private/static fields & methods (supported by 91.1% of browser usage)
  • https://caniuse.com/mdn-javascript_classes_private_class_fields,mdn-javascript_classes_private_class_methods,mdn-javascript_classes_static_class_fields
• Top level await (supported by 90.4% of browser usage)
  • https://caniuse.com/mdn-javascript_operators_await_top_level
• Array.at (supported by 89.5% of browser usage)
  • https://caniuse.com/mdn-javascript_builtins_array_at
• Object.hasOwn (supported by 89.2% of browser usage)
  • https://caniuse.com/mdn-javascript_builtins_object_hasown
• Array.findLast & Array.findLastIndex (supported by 88.5% of browser usage)
  • https://caniuse.com/mdn-javascript_builtins_array_findlast,mdn-javascript_builtins_array_findlastindex

Browser usage

Each line only represents the % of browser usage supporting the features for the given ECMAScript version and does not include features of previous versions, which means the % can be lower when combining multiple ECMAScript versions.

• es2023: 88.5%
• es2022: 88.2%
• es2021: 92.2%
• es2020: 92.6%
• es2019: 94.6%
• es2018: 94.8%
• es2017: 95.3%
• es2016: 95.6%
• es2015: 96.3% (aka es6)

Main features

Non-exhaustive list:

• es2023
  • Array.findLast()
  • Array.findLastIndex()
• es2022
  • Instance/private/static field
  • Object.hasOwn()
  • Array.at()
  • Top level await
• es2021
  • Promise.any()
  • String.replaceAll()
• es2020
  • Optional chaining ?
  • Null coalescing operator ??
• es2019
  • Array.flat()
  • Array.flatMap()
  • Object.fromEntries()
• es2018
  • Promise.finally()
  • Improved rest/spread operator ...
• es2017
  • await operator
  • Async function
• es2016:
  • Array.includes()
  • Exponentiation operator **
  • Improved rest/spread operator ...
  • Improved generator
• es2015
  • Class
  • Promise
  • Arrow function
  • Rest/spread operator ...
  • for of loop
  • Template literal `${}`
  • Generator

Can I use references

Some links may not display results properly as Can I use struggles to display more than 8 selected features.

• es2023
  • https://caniuse.com/?feats=mdn-javascript_builtins_array_findlast,mdn-javascript_builtins_array_findlastindex,mdn-javascript_grammar_hashbang_comments
• es2022
  • https://caniuse.com/?feats=mdn-javascript_builtins_array_at,mdn-javascript_builtins_regexp_hasindices,mdn-javascript_builtins_object_hasown,mdn-javascript_builtins_error_cause,mdn-javascript_operators_await_top_level,mdn-javascript_classes_private_class_fields,mdn-javascript_classes_private_class_methods,mdn-javascript_classes_static_class_fields
• es2021
  • https://caniuse.com/?feats=mdn-javascript_builtins_string_replaceall,mdn-javascript_builtins_promise_any,mdn-javascript_builtins_weakref,mdn-javascript_operators_logical_or_assignment,mdn-javascript_operators_logical_and_assignment,mdn-javascript_operators_logical_nullish_assignment,mdn-javascript_grammar_numeric_separators,mdn-javascript_builtins_finalizationregistry
• es2020
  • https://caniuse.com/?feats=mdn-javascript_operators_optional_chaining,mdn-javascript_operators_nullish_coalescing,mdn-javascript_builtins_globalthis,es6-module-dynamic-import,bigint,mdn-javascript_builtins_promise_allsettled,mdn-javascript_builtins_string_matchall,mdn-javascript_statements_export_namespace,mdn-javascript_operators_import_meta
• es2019
  • https://caniuse.com/?feats=array-flat,mdn-javascript_builtins_object_fromentries,mdn-javascript_builtins_string_trimstart,mdn-javascript_builtins_symbol_description,mdn-javascript_statements_try_catch_optional_catch_binding,mdn-javascript_builtins_json_stringify_well_formed_stringify,mdn-javascript_builtins_array_sort_stable
• es2018
  • https://caniuse.com/?feats=mdn-javascript_builtins_regexp_dotall,mdn-javascript_builtins_regexp_lookbehind_assertion,mdn-javascript_builtins_regexp_named_capture_groups,mdn-javascript_builtins_regexp_property_escapes,mdn-javascript_builtins_symbol_asynciterator,mdn-javascript_functions_method_definitions_async_generator_methods,mdn-javascript_grammar_template_literals_template_literal_revision,mdn-javascript_builtins_promise_finally
• es2017
  • https://caniuse.com/?feats=async-functions,object-values,object-entries,mdn-javascript_builtins_object_getownpropertydescriptors,pad-start-end,mdn-javascript_grammar_trailing_commas_trailing_commas_in_functions
• es2016
  • https://caniuse.com/?feats=array-includes,mdn-javascript_operators_exponentiation
• es2015
  • https://caniuse.com/?feats=es6