This utility modifies .d.ts files generated using TS 2.1. It removes any new syntax that is incompatible with TS 1.8.

This allows a library to be develped using TS 2.1, but consumed by an app that uses TS 1.8.

npm i --save-dev dts-downlevel

Command line use:

dts-downlevel [paths]

If [paths] is omitted, all .d.ts files in the current directory and below are modified.

dts-downlevel 'dist/**/*.d.ts' 'build/**/*.d.ts'

To see the rules that this utility currently supports, view the source code: https://github.com/christopherthielen/dts-downlevel/blob/master/rules.js