Enum EsTarget 

pub enum EsTarget {
    Es2015,
    Es2016,
    Es2017,
    Es2018,
    Es2019,
    Es2020,
    Es2021,
    Es2022,
    Esnext,
}

ECMAScript target version

Determines which JavaScript language features are available in the output. Later versions enable more modern syntax and APIs but require newer runtimes.

Variants

Es2015

ECMAScript 2015 (ES6)

Maximum compatibility. Supports IE11, Node.js 4+, and all modern browsers. Features: classes, arrow functions, promises, let/const.

Es2016

ECMAScript 2016

Adds: Array.prototype.includes, exponentiation operator (**)

Es2017

ECMAScript 2017

Adds: async/await, Object.entries/values, string padding

Es2018

ECMAScript 2018

Adds: async iteration, rest/spread properties, Promise.finally

Es2019

ECMAScript 2019

Adds: Array.prototype.flat/flatMap, Object.fromEntries, optional catch

Es2020

ECMAScript 2020

Adds: optional chaining (?.), nullish coalescing (??), BigInt, dynamic import Good balance between modern features and compatibility. Node.js 14+, modern browsers.

Es2021

ECMAScript 2021

Adds: String.prototype.replaceAll, Promise.any, logical assignment operators

Es2022

ECMAScript 2022

Adds: class fields, top-level await, Array.prototype.at, Object.hasOwn

Esnext

Latest ECMAScript features

Uses the newest JavaScript syntax and APIs. Requires the latest Node.js and browsers. Output may break in older environments.

Trait Implementations

impl Clone for EsTarget

fn clone(&self) -> EsTarget

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EsTarget

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for EsTarget

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for EsTarget

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for EsTarget

fn eq(&self, other: &EsTarget) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for EsTarget

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl ValueEnum for EsTarget

fn value_variants<'a>() -> &'a [Self]

All possible argument values, in display order.

fn to_possible_value<'a>(&self) -> Option<PossibleValue>

The canonical argument value.

fn from_str(input: &str, ignore_case: bool) -> Result<Self, String>

Parse an argument into Self.

impl Copy for EsTarget

impl Eq for EsTarget

impl StructuralPartialEq for EsTarget