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## Argument Parser for Shell Scripts Written in TypeScript | ||
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The argument parser is a wrapper of the node:utils `parseArgs` method that aims to standardize how we write shell scripts in TypeScript and centralize text transformation of parsed arguments. | ||
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### How to Use the Argument Parser in a Shell Script | ||
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Let's say you want the `$1` (first positional) argument to be required and you want to optionally support two additional arguments. Now you can define a `ScriptConfig` object at the top of your script: | ||
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```typescript | ||
const scriptConfig: ScriptConfig = { | ||
description: 'some-script.ts - works wonders', | ||
parameters: { | ||
eventCode: { | ||
position: 0, | ||
required: true, | ||
type: 'string', | ||
}, | ||
fiscal: { | ||
default: false, | ||
short: 'f', | ||
type: 'boolean', | ||
}, | ||
year: { | ||
default: '2024', | ||
short: 'y', | ||
transform: 'number', | ||
type: 'string', | ||
}, | ||
}, | ||
}; | ||
``` | ||
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And then elsewhere in the script you can get the values from the argument parser thusly: | ||
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```typescript | ||
const { eventCode, fiscal, verbose, year } = parseArguments(scriptConfig); | ||
``` | ||
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### In Action | ||
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Given the configuration above, say you call your script like so: | ||
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```bash | ||
npx ts-node --transpile-only scripts/some-script.ts NOA -f | ||
``` | ||
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The argument parser will return the following: | ||
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```typescript | ||
{ | ||
eventCode: 'NOA', | ||
fiscal: true, | ||
year: 2024, | ||
}; | ||
``` | ||
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### Self-Documenting | ||
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All scripts that utilize the argument parser will get a `--help` flag that, when provided, will output usage information automatically generated from the `ScriptConfig` configuration object. | ||
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Again, given the configuration above, say you call your script like so: | ||
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```bash | ||
npx ts-node --transpile-only scripts/some-script.ts --help | ||
``` | ||
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The argument parser will print the following: | ||
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``` | ||
some-script.ts - works wonders | ||
Usage: some-script.ts <eventCode> [ -f -y <year> ] | ||
``` |
Oops, something went wrong.