From b0e71321a99b952f2eb4c82fe10edcfed8cbcb25 Mon Sep 17 00:00:00 2001
From: Martijn Cuppens <martijn.cuppens@intracto.com>
Date: Thu, 6 Dec 2018 22:31:57 +0100
Subject: Warn if rfs is imported more than once

---
 sass/_rfs.sass  |  7 +++++++
 scss/_rfs.scss  |  8 ++++++++
 stylus/rfs.styl | 10 ++++++++++
 3 files changed, 25 insertions(+)

diff --git a/sass/_rfs.sass b/sass/_rfs.sass
index faa283f..9f232f2 100644
--- a/sass/_rfs.sass
+++ b/sass/_rfs.sass
@@ -166,3 +166,10 @@ $rfs-breakpoint-unit: unit($rfs-breakpoint)
 // The responsive-font-size mixin uses RFS to rescale font sizes
 =responsive-font-size($fs, $important: false)
   +rfs($fs, $important)
+
+$rfs-is-included: false !default
+
+@if $rfs-is-included
+  @warn "Watch out, RFS is included more than once!"
+
+$rfs-is-included: true
diff --git a/scss/_rfs.scss b/scss/_rfs.scss
index 8aa9710..b9314d8 100644
--- a/scss/_rfs.scss
+++ b/scss/_rfs.scss
@@ -202,3 +202,11 @@ $rfs-breakpoint-unit: unit($rfs-breakpoint);
 @mixin responsive-font-size($fs, $important: false) {
   @include rfs($fs, $important);
 }
+
+$rfs-is-included: false !default;
+
+@if $rfs-is-included {
+  @warn "Watch out, RFS is included more than once!";
+}
+
+$rfs-is-included: true;
diff --git a/stylus/rfs.styl b/stylus/rfs.styl
index 8e15945..00b48ab 100644
--- a/stylus/rfs.styl
+++ b/stylus/rfs.styl
@@ -49,6 +49,9 @@ $rfs-breakpoint-unit = unit($rfs-breakpoint)
 // Remove unit from $rfs-breakpoint for calculations
 if $rfs-breakpoint-unit == "px"
   $rfs-breakpoint = unit($rfs-breakpoint, "")
+else if $rfs-breakpoint-unit == ""
+  // Use `px` as default
+  $rfs-breakpoint-unit = "px"
 else if $rfs-breakpoint-unit == "rem" or $rfs-breakpoint-unit == "em"
   $rfs-breakpoint = unit($rfs-breakpoint * $rfs-rem-value, "")
 
@@ -172,3 +175,10 @@ rfs($fs, $important = false)
 // The responsive-font-size mixin uses RFS to rescale font sizes
 responsive-font-size($fs, $important = false)
   rfs($fs, $important)
+
+$rfs-is-included ?= false
+
+if $rfs-is-included
+  warn("Watch out, RFS is included more than once!")
+
+$rfs-is-included = true
-- 
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