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2019-03-19tty: add NO_COLOR and FORCE_COLOR supportRuben Bridgewater
This adds support to enforce a specific color depth by checking the `FORCE_COLOR` environment variable similar to `chalk`. On top of that we also add support for the `NO_COLOR` environment variable as suggested by https://no-color.org/. PR-URL: https://github.com/nodejs/node/pull/26485 Refs: https://github.com/nodejs/node/pull/26248 Reviewed-By: Roman Reiss <me@silverwind.io> Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
2019-03-05tty: add hasColors functionRuben Bridgewater
This adds a small wrapper around the `getColorDepth` function to check if the stream supports at least a specific amount of colors. This is convenient as the other API is not as straight forward and most use cases likely only want to know if a specific amount of colors is supported or not. PR-URL: https://github.com/nodejs/node/pull/26247 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Weijia Wang <starkwang@126.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>