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Flow throws errors about blockStyleFn

See original GitHub issue

Flow is throwing two errors related to blockStyleFn.

~/Desktop/Projects/my-project $ flow
Error: node_modules/draft-js/lib/DraftEditor.react.js.flow:245
245:             <DraftEditorContents blockRenderMap={this.props.blockRenderMap} blockRendererFn={this.props.blockRendererFn} blockStyleFn={this.props.blockStyleFn} customStyleMap={{ ...DefaultDraftInlineStyle, ...this.props.customStyleMap }} customStyleFn={this.props.customStyleFn} editorKey={this._editorKey} editorState={this.props.editorState} key={'contents' + this.state.contentsKey} textDirectionality={this.props.textDirectionality} />
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ props of React element `DraftEditorContents`. This type is incompatible with
 44: class DraftEditorContents extends React.Component<Props> {
                                                       ^^^^^ object type. See: node_modules/draft-js/lib/DraftEditorContents.react.js.flow:44
  Property `blockRendererFn` is incompatible:
    245:             <DraftEditorContents blockRenderMap={this.props.blockRenderMap} blockRendererFn={this.props.blockRendererFn} blockStyleFn={this.props.blockStyleFn} customStyleMap={{ ...DefaultDraftInlineStyle, ...this.props.customStyleMap }} customStyleFn={this.props.customStyleFn} editorKey={this._editorKey} editorState={this.props.editorState} key={'contents' + this.state.contentsKey} textDirectionality={this.props.textDirectionality} />
                                                                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^ undefined. This type is incompatible with
     29:   blockRendererFn: Function;
                            ^^^^^^^^ function type. See: node_modules/draft-js/lib/DraftEditorContents.react.js.flow:29

Error: node_modules/draft-js/lib/DraftEditor.react.js.flow:245
245:             <DraftEditorContents blockRenderMap={this.props.blockRenderMap} blockRendererFn={this.props.blockRendererFn} blockStyleFn={this.props.blockStyleFn} customStyleMap={{ ...DefaultDraftInlineStyle, ...this.props.customStyleMap }} customStyleFn={this.props.customStyleFn} editorKey={this._editorKey} editorState={this.props.editorState} key={'contents' + this.state.contentsKey} textDirectionality={this.props.textDirectionality} />
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ props of React element `DraftEditorContents`. This type is incompatible with
 44: class DraftEditorContents extends React.Component<Props> {
                                                       ^^^^^ object type. See: node_modules/draft-js/lib/DraftEditorContents.react.js.flow:44
  Property `blockStyleFn` is incompatible:
    245:             <DraftEditorContents blockRenderMap={this.props.blockRenderMap} blockRendererFn={this.props.blockRendererFn} blockStyleFn={this.props.blockStyleFn} customStyleMap={{ ...DefaultDraftInlineStyle, ...this.props.customStyleMap }} customStyleFn={this.props.customStyleFn} editorKey={this._editorKey} editorState={this.props.editorState} key={'contents' + this.state.contentsKey} textDirectionality={this.props.textDirectionality} />
                                                                                                                                                ^^^^^^^^^^^^^^^^^^^^^^^ undefined. This type is incompatible with
     30:   blockStyleFn: (block: ContentBlock) => string;
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function type. See: node_modules/draft-js/lib/DraftEditorContents.react.js.flow:30

I’m encountering these errors on a fresh project, with draft-js at 0.10.4 and flow-bin at 0.58.0.