Function getAppPath

getAppPath(filePath: string, additionalPath: string, fileName?: string): string
Get a path appeneded to the project root. This function makes it easy to get a file path inside a project for CLI work (mostly to read and write to JSON and markdown files). It dispenses with worrying about ../../ nonsense.

This function is for use specifically for CLI work. It does not work on serverless environments.
Parameters
- filePath: string
  The fully path of a TypeScript file. Can either a File URL or simple full path.
- additionalPath: string
  The desired path fragment off of the root.
- OptionalfileName: string
  Optional file name to append to the end of the path.
Returns string
A path from the project root.
Remarks
IMPORTANT NOTE: This function is for use only for CLI use in the dev environment. It will not work in a serverless deployment environment.
Example
```
const markdownDataPath = getFullPath(
      import.meta.url,
      "tests\\test-data\\markdown"
)
```
or
```
const markdownDataPath = getFullPath(
      "C:\\Users\\thumb\\Documents\\projects\\typescript\\utils\\src\\markdown.ts"
      "tests\\test-data\\markdown"
)
```
If the filePath is
```
"C:\\Users\\thumb\\Documents\\projects\\typescript\\utils"
```
and the additionalPath is:
```
"tests\\test-data\\markdown"
```
The result is:
```
"C:\\Users\\thumb\\Documents\\projects\\typescript\\utils\\tests\\test-data\\markdown"
```
- Defined in filesystem.ts:249