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doc: update package.json field definitions #35741

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doc: update package.json field definitions
MylesBorins Oct 21, 2020
fe8e5b9
Update doc/api/packages.md
MylesBorins Oct 22, 2020
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56 changes: 30 additions & 26 deletions doc/api/packages.md
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Expand Up @@ -834,12 +834,12 @@ The following fields in `package.json` files are used in Node.js:

* [`"name"`][] - Relevant when using named imports within a package. Also used
by package managers as the name of the package.
* [`"main"`][] - The default module when loading the package, if exports is not
specified, and in versions of Node.js prior to the introduction of exports.
* [`"type"`][] - The package type determining whether to load `.js` files as
CommonJS or ES modules.
* [`"exports"`][] - Package exports and conditional exports. When present,
limits which submodules can be loaded from within the package.
* [`"main"`][] - The default module when loading the package, if exports is not
specified, and in versions of Node.js prior to the introduction of exports.
* [`"imports"`][] - Package imports, for use by modules within the package
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itself.

Expand Down Expand Up @@ -871,6 +871,30 @@ _npm_ registry requires a name that satisfies
The `"name"` field can be used in addition to the [`"exports"`][] field to
[self-reference][] a package using its name.

### `"main"`
<!-- YAML
added: v0.4.0
-->

* Type: {string}

```json
{
"main": "./main.js"
}
```

The `"main"` field defines the script that is used when the [package directory
is loaded via `require()`](modules.md#modules_folders_as_modules). Its value
is a path.

```js
require('./path/to/directory'); // This resolves to ./path/to/directory/main.js.
```

When a package has an [`"exports"`][] field, this will take precedence over the
`"main"` field when importing the package by name.

### `"type"`
<!-- YAML
added: v12.0.0
Expand All @@ -882,6 +906,8 @@ changes:
description: Unflag `--experimental-modules`.
-->

> Stability: 1 - Experimental

* Type: {string}

The `"type"` field defines the module format that Node.js uses for all
Expand Down Expand Up @@ -948,6 +974,8 @@ changes:
description: Implement conditional exports.
-->

> Stability: 1 - Experimental

* Type: {Object} | {string} | {string[]}

```json
Expand All @@ -969,30 +997,6 @@ referenced via `require` or via `import`.
All paths defined in the `"exports"` must be relative file URLs starting with
`./`.

### `"main"`
<!-- YAML
added: v0.4.0
-->

* Type: {string}

```json
{
"main": "./main.js"
}
```

The `"main"` field defines the script that is used when the [package directory
is loaded via `require()`](modules.md#modules_folders_as_modules). Its value
is interpreted as a path.

```js
require('./path/to/directory'); // This resolves to ./path/to/directory/main.js.
```

When a package has an [`"exports"`][] field, this will take precedence over the
`"main"` field when importing the package by name.

### `"imports"`
<!-- YAML
added: v14.6.0
Expand Down