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doc: fix nits in esm.md 

* Fix some abbreviated wording, a typo and a link.
* Wrap long lines at 80 characters.

PR-URL: https://github.com/nodejs/node/pull/15315
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
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Vse Mozhet Byt 8 years ago
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1 changed files with 25 additions and 12 deletions
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  1. 37
      doc/api/esm.md

37
doc/api/esm.md
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@ -6,17 +6,21 @@
<!--name=esm-->
Node contains support for ES Modules based upon the [the Node EP for ES Modules][].
Node.js contains support for ES Modules based upon the
[Node.js EP for ES Modules][].
Not all features of the EP are complete and will be landing as both VM support and implementation is ready. Error messages are still being polished.
Not all features of the EP are complete and will be landing as both VM support
and implementation is ready. Error messages are still being polished.
## Enabling
<!-- type=misc -->
The `--experimental-modules` flag can be used to enable features for loading ESM modules.
The `--experimental-modules` flag can be used to enable features for loading
ESM modules.
Once this has been set, files ending with `.mjs` will be able to be loaded as ES Modules.
Once this has been set, files ending with `.mjs` will be able to be loaded
as ES Modules.
```sh
node --experimental-modules my-app.mjs
@ -28,7 +32,9 @@ node --experimental-modules my-app.mjs
### Supported
Only the CLI argument for the main entry point to the program can be an entry point into an ESM graph. In the future `import()` can be used to create entry points into ESM graphs at run time.
Only the CLI argument for the main entry point to the program can be an entry
point into an ESM graph. In the future `import()` can be used to create entry
points into ESM graphs at run time.
### Unsupported
@ -43,11 +49,13 @@ Only the CLI argument for the main entry point to the program can be an entry po
### No NODE_PATH
`NODE_PATH` is not part of resolving `import` specifiers. Please use symlinks if this behavior is desired.
`NODE_PATH` is not part of resolving `import` specifiers. Please use symlinks
if this behavior is desired.
### No `require.extensions`
`require.extensions` is not used by `import`. The expectation is that loader hooks can provide this workflow in the future.
`require.extensions` is not used by `import`. The expectation is that loader
hooks can provide this workflow in the future.
### No `require.cache`
@ -55,9 +63,12 @@ Only the CLI argument for the main entry point to the program can be an entry po
### URL based paths
ESM are resolved and cached based upon [URL](url.spec.whatwg.org) semantics. This means that files containing special characters such as `#` and `?` need to be escaped.
ESM are resolved and cached based upon [URL](https://url.spec.whatwg.org/)
semantics. This means that files containing special characters such as `#` and
`?` need to be escaped.
Modules will be loaded multiple times if the `import` specifier used to resolve them have a different query or fragment.
Modules will be loaded multiple times if the `import` specifier used to resolve
them have a different query or fragment.
```js
import './foo?query=1'; // loads ./foo with query of "?query=1"
@ -70,9 +81,11 @@ For now, only modules using the `file:` protocol can be loaded.
All CommonJS, JSON, and C++ modules can be used with `import`.
Modules loaded this way will only be loaded once, even if their query or fragment string differs between `import` statements.
Modules loaded this way will only be loaded once, even if their query
or fragment string differs between `import` statements.
When loaded via `import` these modules will provide a single `default` export representing the value of `module.exports` at the time they finished evaluating.
When loaded via `import` these modules will provide a single `default` export
representing the value of `module.exports` at the time they finished evaluating.
```js
import fs from 'fs';
@ -85,4 +98,4 @@ fs.readFile('./foo.txt', (err, body) => {
});
```
[the Node EP for ES Modules]: https://github.com/nodejs/node-eps/blob/master/002-es-modules.md
[Node.js EP for ES Modules]: https://github.com/nodejs/node-eps/blob/master/002-es-modules.md

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