Nihilistic Pool Man

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    2.0.1 • Public • Published

    Commander integration

    A tool to speed up the workflow of converting Commander commands to Fig completion spec files.


    generateCompletionSpec(command[, options]): string

    Generate a completion spec from the provided command and return it a string.

    • command: a commander.Command object
    • options: an object containing the following optional properties:
      • figSpecCommandName: specify the name of the command used to generate the fig spec (see). It defaults to 'generate-fig-spec'
    addCompletionSpecCommand(command): void

    Add a new Subcommand to the provided command that will print a spec generated when invoked through $CLI generate-fig-spec.

    • command: a commander.Command object


    Using this library is as simple as calling a function. The snippet of code below generates a new spec each time the executable file is run.

    import { program } from 'commander'
    import { generateCompletionSpec } from '@fig/complete-commander'
      .description('The compiler for writing next generation JavaScript')
      .argument('<file>', 'file to compile')
    // Do not generate if production env
    if (process.env.NODE_ENV === 'development') {
      const spec = generateCompletionSpec(program) // write the generated spec to a file or print it to the console

    Custom command

    You can also provide a custom command that generates a spec file when called. For example, the program below generates the Fig spec when eslint generate-fig-spec is run from a Terminal.

    import { program } from 'commander'
    import { addCompletionSpecCommand } from '@fig/complete-commander'
      .description('Find and fix problems in your JavaScript code')
      .argument('<file>', 'file to lint')
    if (process.env.NODE_ENV === 'development') {

    NOTE: the command can be called whatever you want, but if you specify a name different from 'generate-fig-spec' you should set the figSpecCommandName option.

    Options for generateCompletionSpec

    Specify the fig command name

    When creating a custom command to generate a Fig spec whose name is different from 'generateCompletionSpec' you want to avoid including it in the generated file. This option helps you do that.

      .description('Find and fix problems in your JavaScript code')
      .argument('<file>', 'file to lint')
    if (process.env.NODE_ENV === 'development') {
        .command('createSpec') // this command will not be included in the generated spec
        .description('Generate a fig spec')
        .action(() => {
          generateCompletionSpec(program, { figSpecCommandName: 'createSpec' })

    p.s. this tool has been written for commander@8, but should work in the most of the previous versions too.


    This integration was built by Federico Ciardi. Please see his repo for previous git history:


    npm i @fig/complete-commander

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