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https://github.com/jirutka/babel-preset-njs

A Babel preset for njs - NGINX JavaScript
https://github.com/jirutka/babel-preset-njs

babel babel-preset nginx njs

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A Babel preset for njs - NGINX JavaScript

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README 

        
= babel-preset-njs

:npm-name: babel-preset-njs

:gh-name: jirutka/{npm-name}

:gh-branch: master

:ci-workflow: npmjs

:babel-doc-uri: https://babeljs.io/docs/en

:object-rest-spread-mdn-uri: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#Spread_in_object_literals

:array-spread-mdn-uri: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#Spread_in_array_literals

:array-destructuring-mdn-uri: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Array_destructuring



ifdef::env-github[]

image:https://img.shields.io/npm/v/{npm-name}.svg[npm Version, link="https://www.npmjs.org/package/{npm-name}"]

image:https://github.com/{gh-name}/workflows/{ci-workflow}/badge.svg[CI State, link=https://github.com/{gh-name}/actions?query=workflow%3A%22{ci-workflow}%22]

endif::env-github[]



A https://babeljs.io[Babel] https://babeljs.io/docs/en/presets[preset] for transforming JavaScript code with modern language features into code compatible with https://github.com/nginx/njs[njs] (NGINX JavaScript).

This preset includes support for all the ECMAScript features up to ES2021 -- see <> for a complete list.



**TIP:** Take a look at https://github.com/jirutka/njs-typescript-starter[njs-typescript-starter] for a complete starter template for developing njs scripts for https://nginx.org[NGINX] server in https://www.typescriptlang.org[TypeScript] (including integration tests).



== Installation



[source, sh, subs="+attributes"]

----

# using npm:

npm install --save-dev {npm-name}

# or using yarn:

yarn add --dev {npm-name}

----



=== Compatibility Matrix



|===

| preset-njs    | njs     | Babel



| 0.1.0 – 0.2.1 | ≥ 0.5.0 | 7

| 0.7.0         | ≥ 0.7.0 | 7

|===



== Usage



=== With a Configuration File (Recommended)



[source, json, subs="+attributes"]

----

{

  "presets": ["{npm-name}"]

}

----



=== Via CLI



[source, sh, subs="+attributes"]

babel --presets {npm-name} script.js



=== Via Node API



[source, js, subs="+attributes"]

----

require('@babel/core').transform('code', {

  presets: [require('{npm-name}')],

})

----



== Plugins

:babel-plugin-uri: https://babeljs.io/docs/en/babel-plugin

:included: ✓{nbsp}included

:not-needed: ✗{nbsp}not{nbsp}needed

:incompatible: ⚠{nbsp}incompatible



ifdef::npm-readme[]

The list of included Babel plugins is available https://github.com/{gh-name}/blob/{gh-branch}/README.adoc#plugins[here].



endif::npm-readme[]

ifndef::npm-readme[]

The following table lists all relevant https://babeljs.io/docs/en/plugins#transform-plugins[Babel transform plugins] for ECMAScript features up to ES2021.



The *State* column is one of:



* {included} -- The plugin is included in this preset, i.e. njs doesn’t support this feature (or part of it) yet.

* {not-needed} -- The plugin is not needed, i.e. njs already supports this feature.

* {incompatible} -- The plugin is not compatible with njs, i.e. requires features that njs doesn’t support yet.



[cols="30,10,20,40"]

|===

| Plugin | ECMAScript | State | Notes



| {babel-plugin-uri}-transform-member-expression-literals[member-expression-literals]

| ES3

| {not-needed}

|



| {babel-plugin-uri}-transform-property-literals[property-literals]

| ES3

| {not-needed}

|



| {babel-plugin-uri}-transform-reserved-words[reserved-words]

| ES3

| {not-needed}

|



| {babel-plugin-uri}-transform-property-mutators[property-mutators]

| ES5

| {not-needed}

|



| {babel-plugin-uri}-transform-arrow-functions[arrow-functions]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-block-scoped-functions[block-scoped-functions]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-block-scoping[block-scoping]

| ES2015

| {not-needed}

| since njs 0.6.0



| {babel-plugin-uri}-transform-classes[classes]

| ES2015

| {included}

|



| {babel-plugin-uri}-transform-computed-properties[computed-properties]

| ES2015

| {not-needed}

| since njs 0.3.4



| {babel-plugin-uri}-transform-destructuring[destructuring]

| ES2015

| {included}

|



| {babel-plugin-uri}-transform-duplicate-keys[duplicate-keys]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-for-of[for-of]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-function-name[function-name]

| ES2015

| {incompatible}

| https://github.com/nginx/njs/issues/360[njs bug #360]



| {babel-plugin-uri}-transform-instanceof[instanceof]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-literals[literals]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-new-target[new-target]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-object-super[object-super]

| ES2015

| {included}

|



| {babel-plugin-uri}-transform-parameters[parameters]

| ES2015

| {included}

| Only rest parameters are supported.



| {babel-plugin-uri}-transform-shorthand-properties[shorthand-properties]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-spread[spread]

| ES2015

| {included}

|



| {babel-plugin-uri}-transform-sticky-regex[sticky-regex]

| ES2015

| {not-needed}

| since njs 0.6.0



| {babel-plugin-uri}-transform-template-literals[template-literals]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-typeof-symbol[typeof-symbol]

| ES2015

| {not-needed}

|



| {babel-plugin-uri}-transform-unicode-escapes[unicode-escapes]

| ES2015

| {not-needed}

| Supported, but not in identifiers (e.g. variable name).



| {babel-plugin-uri}-transform-unicode-regex[unicode-regex]

| ES2015

| {included}

|



| {babel-plugin-uri}-transform-exponentiation-operator[exponentiation-operator]

| ES2016

| {not-needed}

|



| {babel-plugin-uri}-transform-async-to-generator[async-to-generator]

| ES2017

| {not-needed}

| since njs 0.7.0



| {babel-plugin-uri}-proposal-async-generator-functions[async-generator-functions]

| ES2018

| {incompatible}

| njs doesn’t support generators yet



| {babel-plugin-uri}-transform-dotall-regex[dotall-regex]

| ES2018

| {included}

|



| {babel-plugin-uri}-transform-named-capturing-groups-regex[named-capturing-groups-regex]

| ES2018

| {not-needed}

|



| {babel-plugin-uri}-proposal-object-rest-spread[object-rest-spread]

| ES2018

| {included}

|



| {babel-plugin-uri}-proposal-unicode-property-regex[unicode-property-regex]

| ES2018

| {included}

|



| {babel-plugin-uri}-proposal-optional-catch-binding[optional-catch-binding]

| ES2019

| {included}

|



| {babel-plugin-uri}-proposal-json-strings[json-strings]

| ES2019

| {not-needed}

|



| {babel-plugin-uri}-proposal-dynamic-import[dynamic-import]

| ES2020

| {incompatible}

| njs has only limited support of ES modules.



| {babel-plugin-uri}-proposal-export-namespace-from[export-namespace-from]

| ES2020

| {included}

|



| {babel-plugin-uri}-proposal-nullish-coalescing-operator[nullish-coalescing-operator]

| ES2020

| {not-needed}

|



| {babel-plugin-uri}-proposal-optional-chaining[optional-chaining]

| ES2020

| {included}

|



| {babel-plugin-uri}-proposal-logical-assignment-operators[logical-assignment-operators]

| ES2021

| {included}

|



| {babel-plugin-uri}-proposal-numeric-separator[numeric-separator]

| ES2021

| {not-needed}

|

|===



== Enabled Assumptions



The following assumptions are enabled for better performance and match with the behaviour of the TypeScript transpiler.



* {babel-doc-uri}/assumptions#constantsuper[constantSuper] ({babel-plugin-uri}-transform-classes#loose[classes])

* {babel-doc-uri}/assumptions#noclasscalls[noClassCalls] ({babel-plugin-uri}-transform-classes#loose[classes])

* {babel-doc-uri}/assumptions#setclassmethods[setClassMethods] ({babel-plugin-uri}-transform-classes#loose[classes])

* {babel-doc-uri}/assumptions#superiscallableconstructor[superIsCallableConstructor] ({babel-plugin-uri}-transform-classes#loose[classes])

* {babel-doc-uri}/assumptions#ignorefunctionlength[ignoreFunctionLength] ({babel-plugin-uri}-transform-parameters#loose[parameters])

* {babel-doc-uri}/assumptions#iterableisarray[iterableIsArray] ({babel-plugin-uri}-transform-for-of#assumearray[for-of], {babel-plugin-uri}-transform-spread#loose[spread], {babel-plugin-uri}-transform-destructuring#loose[destructuring])

* {babel-doc-uri}/assumptions#nodocumentall[noDocumentAll]

* {babel-doc-uri}/assumptions#nonewarrows[noNewArrows]

* {babel-doc-uri}/assumptions#setspreadproperties[setSpreadProperties] ({babel-plugin-uri}-proposal-object-rest-spread#loose[object-rest-spread])



endif::npm-readme[]



== References



* http://nginx.org/en/docs/njs/compatibility.html[njs ECMAScript Compatibility]



== License



This project is licensed under http://opensource.org/licenses/MIT/[MIT License].