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