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77 lines
2.6 KiB
Markdown
Executable file
77 lines
2.6 KiB
Markdown
Executable file
---
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title: Babel
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description: Hugo Pipes can process JS files with Babel.
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date: 2019-03-21
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publishdate: 2019-03-21
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categories: [asset management]
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keywords: []
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menu:
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docs:
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parent: "pipes"
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weight: 48
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weight: 48
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sections_weight: 48
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---
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Any JavaScript resource file can be transpiled to another JavaScript version using `resources.Babel` which takes for argument the resource object and an optional dict of options listed below. Babel uses the [babel cli](https://babeljs.io/docs/en/babel-cli).
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{{% note %}}
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Hugo Pipe's Babel requires the `@babel/cli` and `@babel/core` JavaScript packages to be installed in the project or globally (`npm install -g @babel/cli @babel/core`) along with any Babel plugin(s) or preset(s) used (e.g., `npm install @babel/preset-env --save-dev`).
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If you are using the Hugo Snap package, Babel and plugin(s) need to be installed locally within your Hugo site directory, e.g., `npm install @babel/cli @babel/core --save-dev` without the `-g` flag.
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{{% /note %}}
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### Config
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We add the main project's `node_modules` to `NODE_PATH` when running Babel and similar tools. There are some known [issues](https://github.com/babel/babel/issues/5618) with Babel in this area, so if you have a `babel.config.js` living in a Hugo Module (and not in the project itself), we recommend using `require` to load the presets/plugins, e.g.:
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```js
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module.exports = {
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presets: [
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[
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require("@babel/preset-env"),
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{
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useBuiltIns: "entry",
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corejs: 3,
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},
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],
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],
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};
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```
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### Options
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config [string]
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: Path to the Babel configuration file. Hugo will, by default, look for a `babel.config.js` in your project. More information on these configuration files can be found here: [babel configuration](https://babeljs.io/docs/en/configuration).
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minified [bool]
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: Save as many bytes as possible when printing
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noComments [bool]
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: Write comments to generated output (true by default)
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compact [bool]
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: Do not include superfluous whitespace characters and line terminators. Defaults to `auto` if not set.
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verbose [bool]
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: Log everything
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sourceMap [string]
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: Output `inline` or `external` sourcemap from the babel compile. External sourcemaps will be written to the target with the output filename + ".map". Input sourcemaps can be read from js.Build and node modules and combined into the output sourcemaps.
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### Examples
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```go-html-template
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{{- $transpiled := resources.Get "scripts/main.js" | babel -}}
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```
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Or with options:
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```go-html-template
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{{ $opts := dict "noComments" true }}
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{{- $transpiled := resources.Get "scripts/main.js" | babel $opts -}}
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```
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