Method from

java/dagger/internal/codegen/MapType.java:128–131

Returns a MapType for type. @throws IllegalArgumentException if type is not a Map type

(TypeMirror type)

   * @throws IllegalArgumentException if {@code type} is not a {@link Map} type
   */
  static MapType from(TypeMirror type) {
    checkArgument(isMap(type), "%s is not a Map", type);
    return new AutoValue_MapType(MoreTypes.equivalence().wrap(MoreTypes.asDeclared(type)));
  }

  /**
   * Returns a {@link MapType} for {@code key}'s {@link Key#type() type}.