/**
     * Get the value for the key 'file.role.from.file'. <br>
     * The value is, e.g. true <br>
     * comment: Whether to get file roles from a file.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getFileRoleFromFile();

    /**
     * Is the property for the key 'file.role.from.file' true? <br>
     * The value is, e.g. true <br>

z-index: 1;\n  height: $custom-file-height;\n  padding: $custom-file-padding-y $custom-file-padding-x;\n  overflow: hidden;\n  font-family: $custom-file-font-family;\n  font-weight: $custom-file-font-weight;\n  line-height: $custom-file-line-height;\n  color: $custom-file-color;\n  background-color: $custom-file-bg;\n  border: $custom-file-border-width solid $custom-file-border-color;\n  @include border-radius($custom-file-border-radius);\n  @include box-shadow($custom-file-box-shadow);\n\n  &::after {\n...