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Editing CLI flags
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@ -18,26 +18,33 @@ npm install -g typescript
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Typecheck a file:
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```bash
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tsc --checkJs --allowJs example.js --outfile /dev/null
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tsc --checkJs --allowJs example.js --noEmit
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```
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| Flag | Description |
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| ----------- | ------------------------------------------------------- |
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| `--checkJs` | Allow JavaScript files to be a part of your program. |
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| `--allowJs` | Enable error reporting in type-checked JavaScript files |
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| `--noEmit` | Disable emitting files from a compilation. |
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Since `tsc` is primarily a compiler, it will produce code output. We're only concerned with seeing if there's any type errors, so we throw away the compiled code by writing to `/dev/null`.
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Since `tsc` is primarily a compile, it by default produces code output.
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We're only concerned with seeing any type errors, so we throw away
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the compiled code with the flag `--noEmit`.[^1]
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[^1]: In an earlier version of this post, I had `--outfile /dev/null` instead of `--noEmit`.
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[Veyndan](https://veyndan.com/) kindly reached out and showed how the `--noEmit` flag is
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more flexible in allowing for exported classes.
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Now it's likely that we're using features of the standard library or the DOM in our Javascript code. We need to include a couple flags for Typescript to understand them.
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| Flag | Description |
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| ---------- | ------------------------------------------------------------ |
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| `--target` | Set the JavaScript language version for emitted JavaScript and include compatible library declarations. |
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| `--lib` | Specify a set of bundled library declaration files that describe the target runtime environment |
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| `--lib` | Specify a set of bundled library declaration files that describe the target runtime environment. |
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You can see `tsc --help`for the long list of options. Here's an example for targetting `ES2022` with the DOM library.
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```bash
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tsc --checkJs --allowJs --target es2022 --lib es2022,dom example.js --outfile /dev/null
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tsc --checkJs --allowJs --target es2022 --lib es2022,dom example.js --noEmit
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```
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