some usable variables inside vscode's tasks

tasks.json

// from https://github.com/orta/vscode-jest/blob/master/.vscode/tasks.json
// Available variables which can be used inside of strings.
// ${workspaceRoot}: the root folder of the team
// ${file}: the current opened file
// ${fileBasename}: the current opened file's basename
// ${fileDirname}: the current opened file's dirname
// ${fileExtname}: the current opened file's extension
// ${cwd}: the current working directory of the spawned process

// A task runner that calls a custom npm script that compiles the extension.
{
    "version": "0.1.0",

    // we want to run npm
    "command": "npm",

    // the command is a shell script
    "isShellCommand": true,

    // show the output window only if unrecognized errors occur.
    "showOutput": "silent",

    // we run the custom script "compile" as defined in package.json
    "args": ["run", "compile", "--loglevel", "silent"],

    // The tsc compiler is started in watching mode
    "isWatching": true,

    // use the standard tsc in watch mode problem matcher to find compile problems in the output.
    "problemMatcher": "$tsc-watch"
}