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Support regex in alias

See original GitHub issue

🙋 feature request

Will Parcel support regex in alias?

🤔 Expected Behavior

Having the project structure such this:

❯ tree
.
├── main.js
├── modules
│   └── lazyload
│       └── index.js
└── utilities
    ├── filters.js
    ├── helpers
    │   └── index.js
    ├── selectors
    │   └── index.js
    └── utils.js

5 directories, 6 files

Parcel should be able to use regex in import alias, such:

alias: {
    '@modules': './src/scripts/modules',
    '@utilities': './src/scripts/utilities',
  },

😯 Current Behavior

Currently, we have to specify explicitly each alias:

"alias": {
    "@modules/lazyload": "./src/scripts/modules/lazyload/index.js",
    "@utilities/selectors": "./src/scripts/utilities/selectors/index.js",
    "@utilities/helpers": "./src/scripts/utilities/helpers/index.js"
  },

💁 Possible Solution

How other bundler approaches the problem. In other Bundler, I just need to specify part of alias (only top-level modules) :

Webpack:

  alias: {
        "@utilities": path.resolve(__dirname, "src/site/includes/js/utilities"),
        "@modules": path.resolve(__dirname, "src/site/includes/js/modules"),
      },

Snowpack:

alias: {
    '@modules': './src/scripts/modules',
    '@utilities': './src/scripts/utilities',
  },

esbuild:

// Redirect all paths starting with "@modules/" to "src/scripts/modules"
    build.onResolve({ filter: /^@modules\// }, (args) => {
      // get such `@modules/mobile-nav` without the `@module` part
      let moduleName = args.path.split("/")[1]
      return { path: path.resolve("src/scripts/modules", moduleName, "index.js") }
    })

    build.onResolve({ filter: /^@utilities\// }, (args) => {
      let moduleName = args.path.split("/")[1]
      return { path: path.resolve("src/scripts/utilities", moduleName, "index.js") }
    })

🔦 Context

Imagine having more than 10 import to the different directory with the alias. In Parcel we need to specify explicitly 10 alias in package.json to concrete file instead of using regex.

"parcel": "^2.0.0-beta.3.1",

Issue Analytics

State:
Created 2 years ago
Comments:9 (5 by maintainers)

Top GitHub Comments

2reactions

mischniccommented, Jun 2, 2021

We should probably add that to the docs.

I still think we should support '@modules': './src/scripts/modules' for cross-compatibility reasons. Aliasing a folder to another folder should already work and this is just that one special case of mapping the org part of a package name.

1reaction

DeMoorJaspercommented, Aug 30, 2021

@purp1eeeee using ~/ might be the issue as that is already handled by parcel itself, probably better to use something like @/ instead

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