# 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`
```typescript
Source.prototype.source() -> String | Buffer
```
Returns the represented source code as string or Buffer (for binary Sources).
#### `buffer`
```typescript
Source.prototype.buffer() -> Buffer
```
Returns the represented source code as Buffer. Strings are converted to utf-8.
#### `size`
```typescript
Source.prototype.size() -> Number
```
Returns the size in bytes of the represented source code.
#### `map`
```typescript
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.
#### `sourceAndMap`
```typescript
Source.prototype.sourceAndMap(options?: Object) -> {
source: String | Buffer,
map: Object | null
}
```
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`
```typescript
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)
## `RawSource`
Represents source code without SourceMap.
```typescript
new RawSource(sourceCode: String | Buffer)
```
## `OriginalSource`
Represents source code, which is a copy of the original file.
```typescript
new OriginalSource(
sourceCode: String | Buffer,
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.
```typescript
new SourceMapSource(
sourceCode: String | Buffer,
name: String,
sourceMap: Object | String | Buffer,
originalSource?: String | Buffer,
innerSourceMap?: Object | String | Buffer,
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`.
## `CachedSource`
Decorates a `Source` and caches returned results of `map`, `source`, `buffer`, `size` and `sourceAndMap` in memory. `updateHash` is not cached.
It tries to reused cached results from other methods to avoid calculations, i. e. when `source` is already cached, calling `size` will get the size from the cached source, calling `sourceAndMap` will only call `map` on the wrapped Source.
```typescript
new CachedSource(source: Source)
new CachedSource(source: Source | () => Source, cachedData?: CachedData)
```
Instead of passing a `Source` object directly one can pass an function that returns a `Source` object. The function is only called when needed and once.
### Public methods
#### `getCachedData()`
Returns the cached data for passing to the constructor. All cached entries are converted to Buffers and strings are avoided.
#### `original()`
Returns the original `Source` object.
#### `originalLazy()`
Returns the original `Source` object or a function returning these.
## `PrefixSource`
Prefix every line of the decorated `Source` with a provided string.
```typescript
new PrefixSource(
prefix: String,
source: Source | String | Buffer
)
```
## `ConcatSource`
Concatenate multiple `Source`s or strings to a single source.
```typescript
new ConcatSource(
...items?: Source | String
)
```
### Public methods
#### `add`
```typescript
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`
```typescript
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`
```typescript
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`.
## `CompatSource`
Converts a Source-like object into a real Source object.
### Public methods
#### static `from`
```typescript
CompatSource.from(sourceLike: any | Source)
```
If `sourceLike` is a real Source it returns it unmodified. Otherwise it returns it wrapped in a CompatSource.
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