Function mapping

mapping<T>(file: string, fallback?: T, write_cb?: ((data: T, changes: number) => void)): T

Mapping a file.

Returns
The mapped value.

Example
```
import { mapping } from "file-mapping";

const data = mapping("./data.json", {});

data.name = "Jacob";
data.age = 19;

// Then, the file should be write automatically and only once.
```
Type Parameters
- T
Parameters
- file: string
  
  The path to the file.
- Optional fallback: T
  
  The fallback value to use if the file is not existing at the beginning.
- Optional write_cb: ((data: T, changes: number) => void)
  
  The callback to trigger when the file is written.
  - - (data: T, changes: number): void
    - Parameters
      
      data: T
      
      changes: number
      
      Returns void
Returns T

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