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@bcoe
Created May 25, 2022
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cli.mjs
import {parseArgs} from 'node:util';
class ArgumentsMissingError extends Error {
constructor(values) {
let msg;
if (!values.variable1 && !values.variable2) {
msg = 'both variable1 and variable2 must be provided';
} else {
msg = `${!values.variable1 ? 'variable1' : 'variable2'} must be provided`;
}
super(msg);
this.code = 'ERR_PARSE_ARGS_ARGUMENTS_MISSING';
}
}
try {
const {values} = parseArgs({
options: {
help: {
type: 'boolean',
short: 'h'
},
variable1: {
short: 'x',
type: 'string'
},
variable2: {
short: 'y',
type: 'string'
}
}
});
if (values.help) {
console.info(`adds two numbers together: node cli.mjs -x 99 -y 22`);
} else if (values.variable1 && values.variable2) {
console.info(`${values.variable1} + ${values.variable2} = ${Number(values.variable1) + Number(values.variable2)}`);
} else {
throw new ArgumentsMissingError(values);
}
} catch (err) {
const parseErrors = [
'ERR_PARSE_ARGS_INVALID_OPTION_VALUE',
'ERR_PARSE_ARGS_UNKNOWN_OPTION',
'ERR_PARSE_ARGS_ARGUMENTS_MISSING'
];
if (parseErrors.includes(err.code)) {
console.error(err.message);
process.exitCode = 1;
} else {
throw err;
}
}
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