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145 lines
4.2 KiB
Markdown
145 lines
4.2 KiB
Markdown
## Command line interface
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Deno is a command line program. You should be familiar with some simple commands
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having followed the examples thus far and already understand the basics of shell
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usage.
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There are multiple ways of viewing the main help text:
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```shell
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# Using the subcommand.
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deno help
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# Using the short flag -- outputs the same as above.
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deno -h
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# Using the long flag -- outputs more detailed help text where available.
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deno --help
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```
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Deno's CLI is subcommand-based. The above commands should show you a list of
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those supported, such as `deno bundle`. To see subcommand-specific help for
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`bundle`, you can similarly run one of:
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```shell
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deno help bundle
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deno bundle -h
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deno bundle --help
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```
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Detailed guides to each subcommand can be found [here](../tools.md).
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### Script source
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Deno can grab the scripts from multiple sources, a filename, a url, and '-' to
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read the file from stdin. The last is useful for integration with other
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applications.
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```shell
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deno run main.ts
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deno run https://mydomain.com/main.ts
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cat main.ts | deno run -
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```
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### Script arguments
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Separately from the Deno runtime flags, you can pass user-space arguments to the
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script you are running by specifying them after the script name:
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```shell
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deno run main.ts a b -c --quiet
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```
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```ts
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// main.ts
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console.log(Deno.args); // [ "a", "b", "-c", "--quiet" ]
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```
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**Note that anything passed after the script name will be passed as a script
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argument and not consumed as a Deno runtime flag.** This leads to the following
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pitfall:
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```shell
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# Good. We grant net permission to net_client.ts.
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deno run --allow-net net_client.ts
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# Bad! --allow-net was passed to Deno.args, throws a net permission error.
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deno run net_client.ts --allow-net
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```
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Some see it as unconventional that:
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> a non-positional flag is parsed differently depending on its position.
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However:
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1. This is the most logical and ergonomic way of distinguishing between runtime
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flags and script arguments.
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2. This is, in fact, the same behaviour as that of any other popular runtime.
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- Try `node -c index.js` and `node index.js -c`. The first will only do a
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syntax check on `index.js` as per Node's `-c` flag. The second will
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_execute_ `index.js` with `-c` passed to `require("process").argv`.
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---
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There exist logical groups of flags that are shared between related subcommands.
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We discuss these below.
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### Watch mode
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You can supply the `--watch` flag to `deno run` to enable the built in file
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watcher. When Deno starts up with this flag it watches the entrypoint, and all
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local files the entrypoint statically imports. Whenever one of these files is
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changed on disk, the program will automatically be restarted.
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```
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deno run --watch main.ts
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```
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### Integrity flags
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Affect commands which can download resources to the cache: `deno cache`,
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`deno run` and `deno test`.
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```
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--lock <FILE> Check the specified lock file
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--lock-write Write lock file. Use with --lock.
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```
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Find out more about these
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[here](../linking_to_external_code/integrity_checking.md).
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### Cache and compilation flags
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Affect commands which can populate the cache: `deno cache`, `deno run` and
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`deno test`. As well as the flags above this includes those which affect module
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resolution, compilation configuration etc.
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```
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--config <FILE> Load tsconfig.json configuration file
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--import-map <FILE> UNSTABLE: Load import map file
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--no-remote Do not resolve remote modules
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--reload=<CACHE_BLOCKLIST> Reload source code cache (recompile TypeScript)
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--unstable Enable unstable APIs
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```
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### Runtime flags
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Affect commands which execute user code: `deno run` and `deno test`. These
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include all of the above as well as the following.
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#### Permission flags
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These are listed [here](./permissions.md#permissions-list).
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#### Other runtime flags
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More flags which affect the execution environment.
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```
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--cached-only Require that remote dependencies are already cached
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--inspect=<HOST:PORT> activate inspector on host:port ...
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--inspect-brk=<HOST:PORT> activate inspector on host:port and break at ...
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--seed <NUMBER> Seed Math.random()
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--v8-flags=<v8-flags> Set V8 command line options. For help: ...
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```
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