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+# @jridgewell/source-map
+
+> Packages `@jridgewell/trace-mapping` and `@jridgewell/gen-mapping` into the familiar source-map API
+
+This isn't the full API, but it's the core functionality. This wraps
+[@jridgewell/trace-mapping][trace-mapping] and [@jridgewell/gen-mapping][gen-mapping]
+implementations.
+
+## Installation
+
+```sh
+npm install @jridgewell/source-map
+```
+
+## Usage
+
+TODO
+
+### SourceMapConsumer
+
+```typescript
+import { SourceMapConsumer } from '@jridgewell/source-map';
+const smc = new SourceMapConsumer({
+  version: 3,
+  names: ['foo'],
+  sources: ['input.js'],
+  mappings: 'AAAAA',
+});
+```
+
+#### SourceMapConsumer.fromSourceMap(mapGenerator[, mapUrl])
+
+Transforms a `SourceMapGenerator` into a `SourceMapConsumer`.
+
+```typescript
+const smg = new SourceMapGenerator();
+
+const smc = SourceMapConsumer.fromSourceMap(map);
+smc.originalPositionFor({ line: 1, column: 0 });
+```
+
+#### SourceMapConsumer.prototype.originalPositionFor(generatedPosition)
+
+```typescript
+const smc = new SourceMapConsumer(map);
+smc.originalPositionFor({ line: 1, column: 0 });
+```
+
+#### SourceMapConsumer.prototype.mappings
+
+```typescript
+const smc = new SourceMapConsumer(map);
+smc.mappings; // AAAA
+```
+
+#### SourceMapConsumer.prototype.allGeneratedPositionsFor(originalPosition)
+
+```typescript
+const smc = new SourceMapConsumer(map);
+smc.allGeneratedpositionsfor({ line: 1, column: 5, source: "baz.ts" });
+// [
+//   { line: 2, column: 8 }
+// ]
+```
+
+#### SourceMapConsumer.prototype.eachMapping(callback[, context[, order]])
+
+> This implementation currently does not support the "order" parameter.
+> This function can only iterate in Generated order.
+
+```typescript
+const smc = new SourceMapConsumer(map);
+smc.eachMapping((mapping) => {
+// { source: 'baz.ts',
+//   generatedLine: 4,
+//   generatedColumn: 5,
+//   originalLine: 4,
+//   originalColumn: 5,
+//   name: null }
+});
+```
+
+#### SourceMapConsumer.prototype.generatedPositionFor(originalPosition)
+
+```typescript
+const smc = new SourceMapConsumer(map);
+smc.generatedPositionFor({ line: 1, column: 5, source: "baz.ts" });
+// { line: 2, column: 8 }
+```
+
+#### SourceMapConsumer.prototype.hasContentsOfAllSources()
+
+```typescript
+const smc = new SourceMapConsumer(map);
+smc.hasContentsOfAllSources();
+// true
+```
+
+#### SourceMapConsumer.prototype.sourceContentFor(source[, returnNullOnMissing])
+
+```typescript
+const smc = new SourceMapConsumer(map);
+smc.generatedPositionFor("baz.ts");
+// "export default ..."
+```
+
+#### SourceMapConsumer.prototype.version
+
+Returns the source map's version
+
+### SourceMapGenerator
+
+```typescript
+import { SourceMapGenerator } from '@jridgewell/source-map';
+const smg = new SourceMapGenerator({
+  file: 'output.js',
+  sourceRoot: 'https://example.com/',
+});
+```
+
+#### SourceMapGenerator.fromSourceMap(map)
+
+Transform a `SourceMapConsumer` into a `SourceMapGenerator`.
+
+```typescript
+const smc = new SourceMapConsumer();
+const smg = SourceMapGenerator.fromSourceMap(smc);
+```
+
+#### SourceMapGenerator.prototype.applySourceMap(sourceMapConsumer[, sourceFile[, sourceMapPath]])
+
+> This method is not implemented yet
+
+#### SourceMapGenerator.prototype.addMapping(mapping)
+
+```typescript
+const smg = new SourceMapGenerator();
+smg.addMapping({
+  generated: { line: 1, column: 0 },
+  source: 'input.js',
+  original: { line: 1, column: 0 },
+  name: 'foo',
+});
+```
+
+#### SourceMapGenerator.prototype.setSourceContent(sourceFile, sourceContent)
+
+```typescript
+const smg = new SourceMapGenerator();
+smg.setSourceContent('input.js', 'foobar');
+```
+
+#### SourceMapGenerator.prototype.toJSON()
+
+```typescript
+const smg = new SourceMapGenerator();
+smg.toJSON(); // { version: 3, names: [], sources: [], mappings: '' }
+```
+
+#### SourceMapGenerator.prototype.toString()
+
+```typescript
+const smg = new SourceMapGenerator();
+smg.toJSON(); // "{version:3,names:[],sources:[],mappings:''}"
+```
+
+#### SourceMapGenerator.prototype.toDecodedMap()
+
+```typescript
+const smg = new SourceMapGenerator();
+smg.toDecodedMap(); // { version: 3, names: [], sources: [], mappings: [] }
+```
+
+## Known differences with other implementations
+
+This implementation has some differences with `source-map` and `source-map-js`.
+
+- `SourceMapConsumer.prototype.eachMapping()`
+  - Does not support the `order` argument
+- `SourceMapGenerator.prototype.applySourceMap()`
+  - Not implemented
+
+[trace-mapping]: https://github.com/jridgewell/trace-mapping/
+[gen-mapping]: https://github.com/jridgewell/gen-mapping/