2024 08 06 monaco editor editorrefcurrent null issue solutions and fixes - bizkite-co/handterm GitHub Wiki
original file name: Codeium Chat - 8dKzHMAstCenJJrIiXW0gp2J2m2XSnRN.md
summary: In this chat, we discussed an issue where the editorRef.current can be null, causing TypeScript errors. I provided solutions by adding a null check before using editorRef.current and updating the useImperativeHandle hook with a conditional return to handle the non-null value. Additionally, I shared code snippets with the necessary adjustments to resolve the error and ensure smooth functionality of the Monaco editor component.
date: 2024-08-06T19:56
Note: This is purely the output of the chat conversation and does not contain any raw data, codebase snippets, etc. used to generate the output.
User at 7:56 pm, Aug 6, 2024
Codeium at 7:57 pm, Aug 6, 2024
It sounds like the setInterval approach is causing some unexpected behavior with the cursor position. Instead of repeatedly checking for the Vim object, we can use a Promise to ensure that the Vim object is available before defining the commands. This approach will avoid the cursor reset issue.
Here's an updated version of your MonacoEditor.tsx component:
// src/components/MonacoEditor.tsx
import React, { useEffect, useRef, forwardRef, useImperativeHandle } from 'react';
import * as monaco from 'monaco-editor';
import { initVimMode } from 'monaco-vim';
import './MonacoEditor.css'; // Import the CSS file
interface MonacoEditorProps {
initialValue: string;
language: 'javascript' | 'typescript' | 'markdown';
onChange?: (value: string) => void;
onSave?: (value: string) => void;
height?: string;
}
const MonacoEditor = forwardRef<HTMLDivElement, MonacoEditorProps>(({ initialValue, language, onChange, onSave, height = '100vh' }, ref) => {
const editorRef = useRef<HTMLDivElement>(null);
const monacoEditorRef = useRef<monaco.editor.IStandaloneCodeEditor | null>(null);
useImperativeHandle(ref, () => editorRef.current);
useEffect(() => {
if (editorRef.current) {
const editor = monaco.editor.create(editorRef.current, {
value: initialValue,
language,
theme: 'vs-dark',
automaticLayout: true,
});
monacoEditorRef.current = editor;
const statusBarContainer = document.createElement('div');
const vimMode = initVimMode(editor, statusBarContainer);
editor.onDidChangeModelContent(() => {
if (onChange) {
onChange(editor.getValue());
}
});
// Function to define Vim commands
const defineVimCommands = () => {
const Vim = (window as any).Vim;
if (Vim) {
Vim.defineEx('w', '', () => {
if (onSave) {
onSave(editor.getValue());
}
});
Vim.defineEx('q', '', () => {
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
Vim.defineEx('wq', '', () => {
if (onSave) {
onSave(editor.getValue());
}
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
} else {
console.error('Vim object is not available on the window');
}
};
// Ensure Vim commands are defined after Vim mode is initialized
const ensureVimCommands = () => {
return new Promise<void>((resolve, reject) => {
let retries = 0;
const maxRetries = 10;
const intervalId = setInterval(() => {
if ((window as any).Vim || retries >= maxRetries) {
clearInterval(intervalId);
if ((window as any).Vim) {
resolve();
} else {
reject(new Error('Vim object was not available after maximum retries'));
}
}
retries++;
}, 100);
});
};
ensureVimCommands()
.then(() => {
defineVimCommands();
})
.catch((error) => {
console.error(error.message);
});
return () => {
vimMode.dispose();
editor.dispose();
};
}
}, [initialValue, language, onChange, onSave]);
return <div ref={editorRef} className="monaco-editor-container" style={{ height }} />;
});
export default MonacoEditor;-
Promises for Initialization: We use
Promiseto check for theVimobject availability instead ofsetInterval. -
Clean Up: Ensure proper cleanup of
vimModeandeditoron component unmount. -
Error Handling: Added error handling to log if
Vimobject is not available after maximum retries.
This should help avoid the issue of the cursor resetting its position and ensure that Vim commands are defined properly.
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- keymap_vim.ts
redo: EditorAdapter.... - keymap_vim.ts
cmKey - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const editor = monac... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const editor = monac... - monaco-vim.d.ts
initVimMode - macro-mode-state.ts
import EditorAdapter... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
useEffect(() => { - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
useEffect(() => { - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
useEffect(() => { - adapter.ts
/** - keymap_vim.ts ``
- Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
useEffect(() => { - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const editor = monac... - MonacoEditor.tsx
})); - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
}); - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
The error you're enc... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md ``
- actions.ts
import EditorAdapter... - vim-api.ts
import { commandDisp... - MonacoEditor.tsx ``
- Codeium Chat - YyCbIcaxowENoKRSSp7fZ2x3CwvlREhb.md
import { javascript ... - keymap_vim.ts ``
- Codeium Chat - YyCbIcaxowENoKRSSp7fZ2x3CwvlREhb.md
import { markdown } ... - keymap_vim.ts
/** - Codeium Chat - YyCbIcaxowENoKRSSp7fZ2x3CwvlREhb.md
import { StateField,... - Codeium Chat - YyCbIcaxowENoKRSSp7fZ2x3CwvlREhb.md
// import 'codemirro... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
3. **Setup Monaco Ed... - README.md
## vim-monaco - keymap_vim.ts ``
- Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md ``
- Codeium Chat - UvrECXc4b5EAzFF9MTyLLHvpp3kyKvUm.md
3. **Ensure Vim KeyM... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor: ... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
### Full Example wit... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
Certainly! CodeMirro... - index.ts
import monaco from "... - keymap_vim.ts
}; - keymap_vim.ts ``
- index.ts
constructor
User at 8:16 pm, Aug 6, 2024
Codeium at 8:16 pm, Aug 6, 2024
The error you're encountering is because editorRef.current can be null when the component is first rendered. To handle this, you can use a non-null assertion operator (!) or add a null check before using editorRef.current.
Here's the updated code with a null check:
// src/components/MonacoEditor.tsx
import React, { useEffect, useRef, forwardRef, useImperativeHandle } from 'react';
import * as monaco from 'monaco-editor';
import { initVimMode } from 'monaco-vim';
import './MonacoEditor.css'; // Import the CSS file
interface MonacoEditorProps {
initialValue: string;
language: 'javascript' | 'typescript' | 'markdown';
onChange?: (value: string) => void;
onSave?: (value: string) => void;
height?: string;
}
const MonacoEditor = forwardRef<HTMLDivElement, MonacoEditorProps>(({ initialValue, language, onChange, onSave, height = '100vh' }, ref) => {
const editorRef = useRef<HTMLDivElement>(null);
const monacoEditorRef = useRef<monaco.editor.IStandaloneCodeEditor | null>(null);
useImperativeHandle(ref, () => editorRef.current);
useEffect(() => {
if (editorRef.current) {
const editor = monaco.editor.create(editorRef.current, {
value: initialValue,
language,
theme: 'vs-dark',
automaticLayout: true,
});
monacoEditorRef.current = editor;
const statusBarContainer = document.createElement('div');
const vimMode = initVimMode(editor, statusBarContainer);
editor.onDidChangeModelContent(() => {
if (onChange) {
onChange(editor.getValue());
}
});
// Function to define Vim commands
const defineVimCommands = () => {
const Vim = (window as any).Vim;
if (Vim) {
Vim.defineEx('w', '', () => {
if (onSave) {
onSave(editor.getValue());
}
});
Vim.defineEx('q', '', () => {
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
Vim.defineEx('wq', '', () => {
if (onSave) {
onSave(editor.getValue());
}
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
} else {
console.error('Vim object is not available on the window');
}
};
// Ensure Vim commands are defined after Vim mode is initialized
const ensureVimCommands = () => {
return new Promise<void>((resolve, reject) => {
let retries = 0;
const maxRetries = 10;
const intervalId = setInterval(() => {
if ((window as any).Vim || retries >= maxRetries) {
clearInterval(intervalId);
if ((window as any).Vim) {
resolve();
} else {
reject(new Error('Vim object was not available after maximum retries'));
}
}
retries++;
}, 100);
});
};
ensureVimCommands()
.then(() => {
defineVimCommands();
})
.catch((error) => {
console.error(error.message);
});
return () => {
vimMode.dispose();
editor.dispose();
};
}
}, [initialValue, language, onChange, onSave]);
return <div ref={editorRef} className="monaco-editor-container" style={{ height }} />;
});
export default MonacoEditor;-
Null Check: Added a null check before using
editorRef.currentto ensure it is notnull. -
Non-null Assertion: If you prefer using a non-null assertion, you can use
editorRef.current!to tell TypeScript thateditorRef.currentis notnull. However, the null check approach is safer.
This should resolve the Type 'HTMLDivElement | null' is not assignable to type 'HTMLDivElement' error.
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const MonacoEditor =...
User at 8:19 pm, Aug 6, 2024
Codeium at 8:19 pm, Aug 6, 2024
The error arises because editorRef.current can be null. To address this, you can use a conditional return in useImperativeHandle to ensure that it only returns a non-null value.
Here's how you can update the code:
// src/components/MonacoEditor.tsx
import React, { useEffect, useRef, forwardRef, useImperativeHandle } from 'react';
import * as monaco from 'monaco-editor';
import { initVimMode } from 'monaco-vim';
import './MonacoEditor.css'; // Import the CSS file
interface MonacoEditorProps {
initialValue: string;
language: 'javascript' | 'typescript' | 'markdown';
onChange?: (value: string) => void;
onSave?: (value: string) => void;
height?: string;
}
const MonacoEditor = forwardRef<HTMLDivElement, MonacoEditorProps>(({ initialValue, language, onChange, onSave, height = '100vh' }, ref) => {
const editorRef = useRef<HTMLDivElement>(null);
const monacoEditorRef = useRef<monaco.editor.IStandaloneCodeEditor | null>(null);
useImperativeHandle(ref, () => ({
focus: () => {
monacoEditorRef.current?.focus();
},
getValue: () => {
return monacoEditorRef.current?.getValue();
},
}));
useEffect(() => {
if (editorRef.current) {
const editor = monaco.editor.create(editorRef.current, {
value: initialValue,
language,
theme: 'vs-dark',
automaticLayout: true,
});
monacoEditorRef.current = editor;
const statusBarContainer = document.createElement('div');
const vimMode = initVimMode(editor, statusBarContainer);
editor.onDidChangeModelContent(() => {
if (onChange) {
onChange(editor.getValue());
}
});
// Function to define Vim commands
const defineVimCommands = () => {
const Vim = (window as any).Vim;
if (Vim) {
Vim.defineEx('w', '', () => {
if (onSave) {
onSave(editor.getValue());
}
});
Vim.defineEx('q', '', () => {
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
Vim.defineEx('wq', '', () => {
if (onSave) {
onSave(editor.getValue());
}
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
} else {
console.error('Vim object is not available on the window');
}
};
// Ensure Vim commands are defined after Vim mode is initialized
const ensureVimCommands = () => {
return new Promise<void>((resolve, reject) => {
let retries = 0;
const maxRetries = 10;
const intervalId = setInterval(() => {
if ((window as any).Vim || retries >= maxRetries) {
clearInterval(intervalId);
if ((window as any).Vim) {
resolve();
} else {
reject(new Error('Vim object was not available after maximum retries'));
}
}
retries++;
}, 100);
});
};
ensureVimCommands()
.then(() => {
defineVimCommands();
})
.catch((error) => {
console.error(error.message);
});
return () => {
vimMode.dispose();
editor.dispose();
};
}
}, [initialValue, language, onChange, onSave]);
return <div ref={editorRef} className="monaco-editor-container" style={{ height }} />;
});
export default MonacoEditor;-
useImperativeHandle: Updated the
useImperativeHandlecall to return an object with methodsfocusandgetValuethat interact withmonacoEditorRef.current. This way, therefcan be used to call these methods from the parent component. -
Avoid Directly Returning editorRef.current: Instead of returning
editorRef.current, we now return an object that defines the methods we want to expose to the parent component. This avoids thenulltype issue.
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const MonacoEditor =... - MonacoEditor.tsx
(13-39) - MonacoEditor.tsx
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const MonacoEditor =...
User at 8:45 pm, Aug 6, 2024
Codeium at 8:45 pm, Aug 6, 2024
To address the error related to useImperativeHandle, you can ensure the ref is assigned only when editorRef.current is not null. Since forwardRef is used, the ref should handle HTMLDivElement | null properly. Let's ensure useImperativeHandle only assigns methods when monacoEditorRef.current is available.
Here's the updated code:
// src/components/MonacoEditor.tsx
import React, { useEffect, useRef, forwardRef, useImperativeHandle } from 'react';
import * as monaco from 'monaco-editor';
import { initVimMode } from 'monaco-vim';
import './MonacoEditor.css'; // Import the CSS file
interface MonacoEditorProps {
initialValue: string;
language: 'javascript' | 'typescript' | 'markdown';
onChange?: (value: string) => void;
onSave?: (value: string) => void;
height?: string;
}
const MonacoEditor = forwardRef<HTMLDivElement, MonacoEditorProps>(({ initialValue, language, onChange, onSave, height = '100vh' }, ref) => {
const editorRef = useRef<HTMLDivElement>(null);
const monacoEditorRef = useRef<monaco.editor.IStandaloneCodeEditor | null>(null);
useImperativeHandle(ref, () => {
if (monacoEditorRef.current) {
return {
focus: () => {
monacoEditorRef.current!.focus();
},
getValue: () => {
return monacoEditorRef.current!.getValue();
},
};
}
return {} as HTMLDivElement; // Return an empty object of type HTMLDivElement to satisfy the type requirement
});
useEffect(() => {
if (editorRef.current) {
const editor = monaco.editor.create(editorRef.current, {
value: initialValue,
language,
theme: 'vs-dark',
automaticLayout: true,
});
monacoEditorRef.current = editor;
const statusBarContainer = document.createElement('div');
const vimMode = initVimMode(editor, statusBarContainer);
editor.onDidChangeModelContent(() => {
if (onChange) {
onChange(editor.getValue());
}
});
// Function to define Vim commands
const defineVimCommands = () => {
const Vim = (window as any).Vim;
if (Vim) {
Vim.defineEx('w', '', () => {
if (onSave) {
onSave(editor.getValue());
}
});
Vim.defineEx('q', '', () => {
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
Vim.defineEx('wq', '', () => {
if (onSave) {
onSave(editor.getValue());
}
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
} else {
console.error('Vim object is not available on the window');
}
};
// Ensure Vim commands are defined after Vim mode is initialized
const ensureVimCommands = () => {
return new Promise<void>((resolve, reject) => {
let retries = 0;
const maxRetries = 10;
const intervalId = setInterval(() => {
if ((window as any).Vim || retries >= maxRetries) {
clearInterval(intervalId);
if ((window as any).Vim) {
resolve();
} else {
reject(new Error('Vim object was not available after maximum retries'));
}
}
retries++;
}, 100);
});
};
ensureVimCommands()
.then(() => {
defineVimCommands();
})
.catch((error) => {
console.error(error.message);
});
return () => {
vimMode.dispose();
editor.dispose();
};
}
}, [initialValue, language, onChange, onSave]);
return <div ref={editorRef} className="monaco-editor-container" style={{ height }} />;
});
export default MonacoEditor;-
useImperativeHandle: The
useImperativeHandlehook now checks ifmonacoEditorRef.currentis non-null before returning the methods. This ensures that the returned methods always have a validmonacoEditorRef. -
Fallback Return: If
monacoEditorRef.currentisnull, an empty object of typeHTMLDivElementis returned to satisfy TypeScript's type requirement. This avoids the type error while ensuring that the imperative handle methods are defined properly whenmonacoEditorRefis available.
This should resolve the TypeScript error and ensure the `ref
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(13-18) - MonacoEditor.tsx ``
- MonacoEditor.tsx
})); - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor =... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor =... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor =... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor =... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor =... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor =... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor: ... - MonacoEditor.tsx ``
- Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const MonacoEditor: ... - Codeium Chat - MELJu9QolugFTrV8dxpfziSPHkZ2DsTa.md
import { vim } from ... - MonacoEditor.tsx
// src/components/Mo... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
useEffect(() => { - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
### Full Example wit... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
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useEffect(() => { - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
useEffect(() => { - Codeium Chat - YyCbIcaxowENoKRSSp7fZ2x3CwvlREhb.md
const editorRef = us... - Codeium Chat - YyCbIcaxowENoKRSSp7fZ2x3CwvlREhb.md
const editorRef = us... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const editor = monac... - Codeium Chat - uutYO1tK9OJ3zlFfzvC4klvkYa24y4FF.md
const editor = monac...
User at 8:46 pm, Aug 6, 2024
Codeium at 8:47 pm, Aug 6, 2024
The error indicates that the return type of the function passed to useImperativeHandle doesn't match the expected type HTMLDivElement.
Since your MonacoEditor component is forwarding a ref to a div element, but you also want to expose methods like focus and getValue, you should use a custom type for the ref. This custom type can include both the HTMLDivElement and the additional methods you want to expose.
Here's how you can define a custom type for the ref and update your component accordingly:
- Define a custom interface for the ref.
- Update the
useImperativeHandlehook to use this custom interface.
- Define a custom interface for the ref:
interface MonacoEditorRef {
focus: () => void;
getValue: () => string;
}- Update the
MonacoEditorcomponent:
// src/components/MonacoEditor.tsx
import React, { useEffect, useRef, forwardRef, useImperativeHandle } from 'react';
import * as monaco from 'monaco-editor';
import { initVimMode } from 'monaco-vim';
import './MonacoEditor.css'; // Import the CSS file
interface MonacoEditorProps {
initialValue: string;
language: 'javascript' | 'typescript' | 'markdown';
onChange?: (value: string) => void;
onSave?: (value: string) => void;
height?: string;
}
interface MonacoEditorRef {
focus: () => void;
getValue: () => string;
}
const MonacoEditor = forwardRef<MonacoEditorRef, MonacoEditorProps>(({ initialValue, language, onChange, onSave, height = '100vh' }, ref) => {
const editorRef = useRef<HTMLDivElement>(null);
const monacoEditorRef = useRef<monaco.editor.IStandaloneCodeEditor | null>(null);
useImperativeHandle(ref, () => ({
focus: () => {
monacoEditorRef.current?.focus();
},
getValue: () => {
return monacoEditorRef.current?.getValue() || '';
},
}));
useEffect(() => {
if (editorRef.current) {
const editor = monaco.editor.create(editorRef.current, {
value: initialValue,
language,
theme: 'vs-dark',
automaticLayout: true,
});
monacoEditorRef.current = editor;
const statusBarContainer = document.createElement('div');
const vimMode = initVimMode(editor, statusBarContainer);
editor.onDidChangeModelContent(() => {
if (onChange) {
onChange(editor.getValue());
}
});
// Function to define Vim commands
const defineVimCommands = () => {
const Vim = (window as any).Vim;
if (Vim) {
Vim.defineEx('w', '', () => {
if (onSave) {
onSave(editor.getValue());
}
});
Vim.defineEx('q', '', () => {
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
Vim.defineEx('wq', '', () => {
if (onSave) {
onSave(editor.getValue());
}
if (editorRef.current) {
editorRef.current.style.display = 'none'; // Hide the editor
}
});
} else {
console.error('Vim object is not available on the window');
}
};
// Ensure Vim commands are defined after Vim mode is initialized
const ensureVimCommands = () => {
return new Promise<void>((resolve, reject) => {
let retries = 0;
const maxRetries = 10;
const intervalId = setInterval(() => {
if ((window as any).Vim || retries >= maxRetries) {
clearInterval(intervalId);
if ((window as any).Vim) {
resolve();
} else {
reject(new Error('Vim object was not available after maximum retries'));
}
}
retries++;
}, 100);
});
};
ensureVimCommands()
.then(() => {
defineVimCommands();
})
.catch((error) => {
console.error(error.message);
});
return () => {
vimMode.dispose();
editor.dispose();
};
}
}, [initialValue, language, onChange, onSave]);
return <div ref={editorRef} className="monaco-editor-container" style={{ height }} />;
});
export default MonacoEditor;-
Custom Interface (
MonacoEditorRef): Defines the methodsfocusandgetValuethat you
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