formatSourceWithoutFile(
text,extension,config,options?):Promise<undefined|string>
Format given source text without knowing the source file, asynchronously.
This function will try to find tsconfig.json and ESLint config relating to the source file, and merge them to the base config provided.
options can be used to change tsconfig.json and ESLint config loading behavior for testing
purpose.
string
Source text
File extension to reveal the source language
Base config
FormatOptions
Internal/testing options
Promise<undefined | string>
Promise of the result text or undefined if nothing changes.