Initial commit

node_modules/style-to-js/src/utilities.ts

@@ -0,0 +1,52 @@
+const CUSTOM_PROPERTY_REGEX = /^--[a-zA-Z0-9_-]+$/;
+const HYPHEN_REGEX = /-([a-z])/g;
+const NO_HYPHEN_REGEX = /^[^-]+$/;
+const VENDOR_PREFIX_REGEX = /^-(webkit|moz|ms|o|khtml)-/;
+const MS_VENDOR_PREFIX_REGEX = /^-(ms)-/;
+
+/**
+ * Checks whether to skip camelCase.
+ */
+const skipCamelCase = (property: string) =>
+  !property ||
+  NO_HYPHEN_REGEX.test(property) ||
+  CUSTOM_PROPERTY_REGEX.test(property);
+
+/**
+ * Replacer that capitalizes first character.
+ */
+const capitalize = (match: string, character: string) =>
+  character.toUpperCase();
+
+/**
+ * Replacer that removes beginning hyphen of vendor prefix property.
+ */
+const trimHyphen = (match: string, prefix: string) => `${prefix}-`;
+
+/**
+ * CamelCase options.
+ */
+export interface CamelCaseOptions {
+  reactCompat?: boolean;
+}
+
+/**
+ * CamelCases a CSS property.
+ */
+export const camelCase = (property: string, options: CamelCaseOptions = {}) => {
+  if (skipCamelCase(property)) {
+    return property;
+  }
+
+  property = property.toLowerCase();
+
+  if (options.reactCompat) {
+    // `-ms` vendor prefix should not be capitalized
+    property = property.replace(MS_VENDOR_PREFIX_REGEX, trimHyphen);
+  } else {
+    // for non-React, remove first hyphen so vendor prefix is not capitalized
+    property = property.replace(VENDOR_PREFIX_REGEX, trimHyphen);
+  }
+
+  return property.replace(HYPHEN_REGEX, capitalize);
+};