args.ts — tailwindcss Source File

Source Code

import parse from 'mri'

// Definition of the arguments for a command in the CLI.
export type Arg = {
  [key: `--${string}`]: {
    type: keyof Types
    description: string
    alias?: `-${string}`
    default?: Types[keyof Types]
  }
}

// Each argument will have a type and we want to convert the incoming raw string
// based value to the correct type. We can't use pure TypeScript types because
// these don't exist at runtime. Instead, we define a string-based type that
// maps to a TypeScript type.
type Types = {
  boolean: boolean
  number: number | null
  string: string | null
  'boolean | string': boolean | string | null
  'number | string': number | string | null
  'boolean | number': boolean | number | null
  'boolean | number | string': boolean | number | string | null
}

// Convert the `Arg` type to a type that can be used at runtime.
//
// E.g.:
//
// Arg:
// ```
// { '--input': { type: 'string', description: 'Input file', alias: '-i' } }
// ```
//
// Command:
// ```
// ./tailwindcss -i input.css
// ./tailwindcss --input input.css
// ```
//
// Result type:
// ```
// {
//   _: string[],             // All non-flag arguments
//   '--input': string | null // The `--input` flag will be filled with `null`, if the flag is not used.
//                            // The `null` type will not be there if `default` is provided.
// }
// ```
//
// Result runtime object:
// ```
// {
//   _: [],
//   '--input': 'input.css'
// }
// ```
export type Result<T extends Arg> = {
  [K in keyof T]: T[K] extends { type: keyof Types; default?: any }
    ? undefined extends T[K]['default']
// ... (101 more lines)