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Contents
// This is an example of using tokens to add a custom behaviour.
//
// This adds a option order check so that --some-unstable-option
// may only be used after --enable-experimental-options
//
// Note: this is not a common behaviour, the order of different options
// does not usually matter.
import { parseArgs } from '../index.js';
function findTokenIndex(tokens, target) {
return tokens.findIndex((token) => token.kind === 'option' &&
token.name === target
);
}
const experimentalName = 'enable-experimental-options';
const unstableName = 'some-unstable-option';
const options = {
[experimentalName]: { type: 'boolean' },
[unstableName]: { type: 'boolean' },
};
const { values, tokens } = parseArgs({ options, tokens: true });
const experimentalIndex = findTokenIndex(tokens, experimentalName);
const unstableIndex = findTokenIndex(tokens, unstableName);
if (unstableIndex !== -1 &&
((experimentalIndex === -1) || (unstableIndex < experimentalIndex))) {
throw new Error(`'--${experimentalName}' must be specified before '--${unstableName}'`);
}
console.log(values);
/* eslint-disable max-len */
// Try the following:
// node ordered-options.mjs
// node ordered-options.mjs --some-unstable-option
// node ordered-options.mjs --some-unstable-option --enable-experimental-options
// node ordered-options.mjs --enable-experimental-options --some-unstable-option
Version data entries
33 entries across 33 versions & 1 rubygems