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# webpack-sources
Contains multiple classes which represent a `Source`. A `Source` can be asked for source code, size, source map and hash.
## `Source`
Base class for all sources.
### Public methods
All methods should be considered as expensive as they may need to do computations.
#### `source`
``` js
Source.prototype.source() -> String | ArrayBuffer
```
Returns the represented source code as string.
#### `size`
``` js
Source.prototype.size() -> Number
```
Returns the size in chars of the represented source code.
#### `map`
``` js
Source.prototype.map(options: Object) -> Object | null
```
Returns the SourceMap of the represented source code as JSON. May return `null` if no SourceMap is available.
The `options` object can contain the following keys:
* `columns: Boolean` (default `true`): If set to false the implementation may omit mappings for columns.
* `module: Boolean` (default `true`): If set to false the implementation may omit inner mappings for modules.
#### `sourceAndMap`
``` js
Source.prototype.sourceAndMap(options: Object) -> {
source: String,
map: Object
}
```
Returns both, source code (like `Source.prototype.source()` and SourceMap (like `Source.prototype.map()`). This method could have better performance than calling `source()` and `map()` separately.
See `map()` for `options`.
#### `updateHash`
``` js
Source.prototype.updateHash(hash: Hash) -> void
```
Updates the provided `Hash` object with the content of the represented source code. (`Hash` is an object with an `update` method, which is called with string values)
#### `node` (optional)
``` js
Source.prototype.node(options: Object) -> SourceNode
```
This is an optional method. It may be `null` if not implemented.
Returns a `SourceNode` (see source-map library) for the represented source code.
See `map()` for `options`.
#### `listNode` (optional)
``` js
Source.prototype.listNode(options: Object) -> SourceNode
```
This is an optional method. It may be `null` if not implemented.
Returns a `SourceListMap` (see source-list-map library) for the represented source code.
See `map()` for `options`.
## `RawSource`
Represents source code without SourceMap.
``` js
new RawSource(sourceCode: String)
```
## `OriginalSource`
Represents source code, which is a copy of the original file.
``` js
new OriginalSource(
sourceCode: String,
name: String
)
```
* `sourceCode`: The source code.
* `name`: The filename of the original source code.
OriginalSource tries to create column mappings if requested, by splitting the source code at typical statement borders (`;`, `{`, `}`).
## `SourceMapSource`
Represents source code with SourceMap, optionally having an additional SourceMap for the original source.
``` js
new SourceMapSource(
sourceCode: String,
name: String,
sourceMap: Object | String,
originalSource?: String,
innerSourceMap?: Object | String,
removeOriginalSource?: boolean
)
```
* `sourceCode`: The source code.
* `name`: The filename of the original source code.
* `sourceMap`: The SourceMap for the source code.
* `originalSource`: The source code of the original file. Can be omitted if the `sourceMap` already contains the original source code.
* `innerSourceMap`: The SourceMap for the `originalSource`/`name`.
* `removeOriginalSource`: Removes the source code for `name` from the final map, keeping only the deeper mappings for that file.
The `SourceMapSource` supports "identity" mappings for the `innerSourceMap`.
When original source matches generated source for a mapping it's assumed to be mapped char by char allowing to keep finer mappings from `sourceMap`.
## `LineToLineMappedSource`
Represents source code, which is mapped line by line to the original file.
``` js
new LineToLineMappedSource(
sourceCode: String,
name: String,
originalSource: String
)
```
* `sourceCode`: The source code.
* `name`: The filename of the original source code.
* `originalSource`: The original source code.
## `CachedSource`
Decorates a `Source` and caches returned results of `map`, `source`, `size` and `sourceAndMap` in memory. Every other operation is delegated to the wrapped `Source`.
``` js
new CachedSource(source: Source)
```
## `PrefixSource`
Prefix every line of the decorated `Source` with a provided string.
``` js
new PrefixSource(
prefix: String,
source: Source
)
```
## `ConcatSource`
Concatenate multiple `Source`s or strings to a single source.
``` js
new ConcatSource(
...items?: Source | String
)
```
### Public methods
#### `add`
``` js
ConcatSource.prototype.add(item: Source | String)
```
Adds an item to the source.
## `ReplaceSource`
Decorates a `Source` with replacements and insertions of source code.
The `ReplaceSource` supports "identity" mappings for child source.
When original source matches generated source for a mapping it's assumed to be mapped char by char allowing to split mappings at replacements/insertions.
### Public methods
#### `replace`
``` js
ReplaceSource.prototype.replace(
start: Number,
end: Number,
replacement: String
)
```
Replaces chars from `start` (0-indexed, inclusive) to `end` (0-indexed, inclusive) with `replacement`.
Locations represents locations in the original source and are not influenced by other replacements or insertions.
#### `insert`
``` js
ReplaceSource.prototype.insert(
pos: Number,
insertion: String
)
```
Inserts the `insertion` before char `pos` (0-indexed).
Location represents location in the original source and is not influenced by other replacements or insertions.
#### `original`
Get decorated `Source`.