32 lines
897 B
JavaScript
32 lines
897 B
JavaScript
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'use strict';
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// This is an example of using tokens to add a custom behaviour.
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//
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// Throw an error if an option is used more than once.
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// 1. const { parseArgs } = require('node:util'); // from node
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// 2. const { parseArgs } = require('@pkgjs/parseargs'); // from package
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const { parseArgs } = require('..'); // in repo
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const options = {
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ding: { type: 'boolean', short: 'd' },
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beep: { type: 'boolean', short: 'b' }
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};
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const { values, tokens } = parseArgs({ options, tokens: true });
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const seenBefore = new Set();
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tokens.forEach((token) => {
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if (token.kind !== 'option') return;
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if (seenBefore.has(token.name)) {
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throw new Error(`option '${token.name}' used multiple times`);
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}
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seenBefore.add(token.name);
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});
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console.log(values);
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// Try the following:
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// node no-repeated-options --ding --beep
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// node no-repeated-options --beep -b
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// node no-repeated-options -ddd
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