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by Thom1729 ST3

Customizable JavaScript syntax highlighting for Sublime Text.

Labels javascript, syntax



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JS Custom

Customizable JavaScript syntax highlighting for Sublime Text supporting JSX, Flow, and more. You can use JS Custom as a drop-in replacement for babel-sublime or create your own customized syntax with exactly the features you need. Because JS Custom is based on the core JavaScript syntax, it will work with most tools written for the original — and as the original is updated and improved, JS Custom will inherit those improvements.


JS Custom can be installed via Package Control.

Alternatively, you can install JS Custom manually by cloning it into your Packages directory as “JSCustom”. If you do, you may need to manually install its dependencies.


JS Custom ships with two example configurations: “JS Custom - Default” and “JS Custom - React”. These should automatically be built and available for use upon installation.

All syntaxes built by JS Custom are created inside your User package. They are found in the Syntax menu under “User”, not under “JS Custom”.

To customize your syntaxes, choose Preferences → Package Settings → JS Custom → Settings from the menubar. The package default settings will be shown on the left; your user settings will be on the right. When you change your user settings, your custom syntaxes will automatically be recompiled. (This may take a few seconds, especially if you have a lot of configurations.)

If you modify your user settings outside Sublime Text, this package may not notice your modifications. You can force it to rebuild all of your custom syntaxes by choosing Preferences → Package Settings → JS Custom → Rebuild Syntaxes from the menubar, or by choosing “JS Custom: Rebuild Syntaxes” from the command palette.


JS Custom provides the following commands. Except for “JSX Close Tag”, they are available in the command palette and under Preferences → Package Settings → JS Custom.

JS Custom: Rebuild Syntaxes (build_js_custom_syntaxes)

Rebuild all of your custom syntaxes and remove any obsolete compiled syntaxes.

This command takes an optional versions argument accepting a list of configuration names. If you pass versions, only the specified configurations will be rebuilt.

JS Custom: Clear User Data (clear_js_custom_user_data)

Remove the Packages/User/JS Custom directory, including all compiled syntaxes.

Preferences: JS Custom

Open the default JS Custom preferences and your own JS Custom user preferences side-by-side in a new window (using the built-in edit_settings command).

JSX Close Tag (jsx_close_tag)

As the built-in close_tag command, but should work for JSX tags.

This command is not available in the command palette or the JS Custom menu. By default, whenever you run the close_tag command in a JavaScript file, then the jsx_close_tag command will be run instead. You can disable this with the jsx_close_tag setting.


The following options are available at the top level of your user settings:

configurations: object

An object containing one or more named configurations. The keys should be the names you would like your custom configurations to have. The values are objects specifying syntax options.

defaults: object

An object specifying default syntax options that will apply to all of your syntaxes. Your named configurations will override these defaults.

embed_configuration: object

An object specifying a configuration to use when another syntax embeds the source.js scope.

auto_build: boolean

If true, JS Custom will automatically rebuild your syntaxes when you modify your user settings. Only syntaxes whose configurations have changed will be rebuilt. If auto_build is disabled, you will have to run the rebuild command manually.

jsx_close_tag: string or boolean

When you run the close_tag command, if the scope of the file matches this selector, then this package's jsx_close_tag command will be invoked instead. You may have to modify this setting if you use the scope configuration option

If false, jsx_close_tag will never be run.

reassign_when_deleting: string or false

When you remove a custom configuration, JS Custom will automatically find any views using that configuration and assign them to this default syntax so that Sublime won't show an error popup. You can set this setting to the path or scope of any syntax definition, or set it to false to disable the feature entirely.

Syntax Options

These options, specified in your defaults or in a named custom configuration, determine what features your custom syntaxes will have. Omitted options will be treated as null.

ECMAScript Proposals

These options enable support for various proposed language features. These proposals may change unexpectedly. If they stabilize, they will eventually be incorporated into the core JavaScript syntax and these extensions will be removed.

es_pipeline: boolean

Support the proposed pipeline operator.

es_slice: boolean

Support the proposed slice notation.

Third-party features

These extensions go beyond the base JavaScript syntax to support third-party features.

jsx: boolean

Highlight JSX.

typescript: boolean (Beta)

Highlight TypeScript. TypeScript support is currently in beta, meaning that there may be bugs and that the exact behavior is subject to change.

By default, old-style type assertions (e.g. <T>foo) are not highlighted. You can enable them via the typescript.old_style_assertions option. As an example, these user preferences will provide configurations for both plain TypeScript and TypeScript with JSX:

    "configurations": {
        "TypeScript": {
            "file_extensions": [ "ts" ],
            "typescript": {
                "old_style_assertions": true
        "TypeScript (JSX)": {
            "file_extensions": [ "tsx" ],
            "typescript": true,
            "jsx": true

flow_types: boolean

Highlight Flow type annotations.

eslint_directives: boolean

Highlight eslint configuration directives in comments.


These extensions allow you to personalize your highlighting in various ways.

string_object_keys: boolean

Highlight unquoted object keys as strings, matching babel-sublime's behavior.

custom_templates: object

Use custom syntax highlighting inside template literals. Several sub-options are available:

By default, the special embed_configuration disables this to avoid syntax recursion errors.

tags: object

Highlight tagged template literals based on the tag. Each key in tag should be a JavaScript identifier representing a template literal tag. The associated value should be a string specifying a context to include.

For example, to highlight template strings with the style tag as CSS, use the following configuration:

    "configurations": {
        "My Config": {
            "custom_templates": {
                "tags": {
                    "style": "scope:source.css"

Then, if you use “JS Custom - My Config” to highlight the following code, the contents of this template literal will be highlighted as CSS:

const myStyle = style`div { color: red }`;
comments: object

Highlight untagged template literals based on a preceding block comment. Example configuration:

    "configurations": {
        "My Config": {
            "custom_templates": {
                "comments": {
                    "style": "scope:source.css"

Example JavaScript:

const myStyle = /*style*/`div { color: red }`;
const myStyle = /* style */`div { color: red }`;
lookaheads: object

Highlight untagged template literals based on the contents. Example configuration:

    "configurations": {
        "My Config": {
            "custom_templates": {
                "lookaheads": {
                    "select\b": "scope:source.sql"

Example JavaScript:

const myQuery = `select 1 from dual`;
styled_components: boolean

Highlight template string literals for Styled Components.

clear_all_scopes: boolean

Inside custom template literals, clear all of the enclosing JavaScript scopes. Ordinarily, only the string scope will be cleared. Enable this option if you're using a third-party tool that requires it.


These options don't affect the syntax highlighting itself, but rather the way that Sublime uses the syntax.

name: string

The name of the syntax as it will appear in the syntax selector. (If this is omitted, the syntax will be named “JS Custom - name”, where name is the key in the configurations object.)

scope: string

The top-level scope that will be used for the syntax. (If this is omitted, the scope will be “source.js.name”, where name is based on the key in the configurations object.)

file_extensions: array

An array of file extensions. Files with the given extensions will be use this syntax.

hidden: boolean

If this is true, the compiled syntax will not appear in the syntax menu or the command palette. It can still be referenced or included by other syntaxes.


These options have been superseded by newer, more flexible options.


Superseded by custom_templates.tags.


Superseded by custom_templates.styled_components.

Frequently Asked Questions

My syntaxes don't appear in the syntax selection menu. Where are they?

They are in the syntax selection menu under “User”. It would be nice to have them listed under “JS Custom”, but when generating that menu Sublime only looks at the physical location of the syntax definition files, and JS Custom compiles them to User/JS Custom/Syntaxes.

I've switched from Babel-sublime and my code looks different. How do I restore the old appearance?

If you want unquoted object keys to be highlighted as strings, set the string_object_keys configuration option to true.

Other than that, the differences occur when Babel-sublime's syntax does not conform to the scope naming guidelines or other best practices. If you liked the old appearance, then rather than modifying the syntax itself I would suggest modifying your theme. You can find further discussion here.


To request a feature or report a bug, create a new issue. All suggestions are welcome.

When reporting a bug, please include a code snippet that demonstrates the problem. If the bug exists in Sublime's core JavaScript syntax, it should be reported here — but if you're not sure, then go ahead and post it here.

When requesting a new feature, please include a link to any relevant documentation. Because of the unique design of JS Custom, we can accommodate a variety of nonstandard features.