fix: fix types for interpolations

Author: satya164

src/core/css.js

@@ -9,5 +9,5 @@ function css() {
 module.exports = css;
 
 /* ::
-declare module.exports: (string[], Array<string | number | {}>) => string;
+declare module.exports: (strings: string[], ...exprs: Array<string | number | {}>) => string;
 */

src/react/styled.js

@@ -70,7 +70,7 @@ if (process.env.NODE_ENV !== 'production') {
 /* ::
 type StyledComponent<T> = React.ComponentType<T & { as?: React$ElementType }>;
 
-type StyledTag<T> = (string[], Array<string | number | {} | (T => string | number)>) => StyledComponent<T>;
+type StyledTag<T> = (strings: string[], ...exprs: Array<string | number | {} | (T => string | number)>) => StyledComponent<T>;
 
 declare module.exports: {|
   <T>(T): StyledTag<React.ElementConfig<T>>,