Convert JavaScript to TypeScript

jsts.sh

#!/usr/bin/env bash

if ! [[ -x "$(command -v lebab)" ]]; then
  echo 'Error: lebab is not installed.' >&2
  echo 'Please run: npm install -g lebab tslint' >&2
  exit 1
fi

if ! [[ -x "$(command -v tslint)" ]]; then
  echo 'Error: tslint is not installed.' >&2
  echo 'Please run: npm install -g lebab tslint' >&2
  exit 1
fi

if [[ -z "$1" ]]; then
    echo 'Usage: ./jsts.sh full/path/to/project relative/path/to/file.js' >&1
    exit 0
fi

if [[ -z "$2" ]]; then
    echo 'Usage: ./jsts.sh full/path/to/project relative/path/to/file.js' >&1
    exit 0
fi

cd "$1"

TARGET="$2"
TARGET=${TARGET%???}

echo "New file is $TARGET.ts"
mv "$TARGET.js" "$TARGET.ts"

lebab --replace "$TARGET.ts" --transform arrow
lebab --replace "$TARGET.ts" --transform no-strict
lebab --replace "$TARGET.ts" --transform let
lebab --replace "$TARGET.ts" --transform template
lebab --replace "$TARGET.ts" --transform commonjs

tslint --fix --project . "$TARGET.ts"
# Yep, twice. I have no ideas why it works only this way.
tslint --fix --project . "$TARGET.ts"