improve(transform): use sucrase instead of @swc/wasm-web to improve t…

…ranscoding performance (#38)

README.md

@@ -99,12 +99,11 @@ The source code is written in markdown, refer to [example.md](https://raw.github
 | afterCompile   | (code: string) => string          |                         | Executed after compiling the code                                         |
 | beforeCompile  | (code: string) => string          |                         | Executed before compiling the code                                        |
 | children       | any                               |                         | The code to be rendered is executed. Usually imported via markdown-loader |
-| compiler       | (code: string) => string          |                         | A compiler that transforms the code. Use swc.transformSync by default     |
 | dependencies   | object                            |                         | Dependent objects required by the executed code                           |
 | editable       | boolean                           | false                   | Renders a code editor that can modify the source code                     |
 | editor         | object                            |                         | Editor properties                                                         |
 | onChange       | (code?: string) => void           |                         | Callback triggered after code change                                      |
 | renderToolbar  | (buttons: ReactNode) => ReactNode |                         | Customize the rendering toolbar                                           |
 | sourceCode     | string                            |                         | The code to be rendered is executed                                       |
 | theme          | 'light' , 'dark'                  | 'light'                 | Code editor theme, applied to CodeMirror                                  |
-| compileOptions | object                            | defaultTransformOptions | swc configuration https://swc.rs/docs/configuration/compilation           |
+| compileOptions | object                            | defaultTransformOptions | https://github.com/alangpierce/sucrase#transforms                         |

docs/index.tsx

@@ -15,7 +15,7 @@ const App = () => {
         theme="dark"
         dependencies={{ Button }}
         afterCompile={(code: string) => {
-          return code.replace(/import\ [\w\,\{\}\ ]+\ from\ "[\w-]+";/gi, '');
+          return code.replace(/import\ [\*\w\,\{\}\ ]+\ from\ ?[\."'@/\w-]+;/gi, '');
         }}
       >
         {example}

package.json

@@ -43,13 +43,13 @@
   "dependencies": {
     "@babel/runtime": "^7.18.6",
     "@rsuite/icons": "^1.0.2",
-    "@swc/wasm-web": "^1.2.208",
     "@types/codemirror": "5.60.5",
     "classnames": "^2.2.5",
     "codemirror": "5.65.6",
     "highlight.js": "^11.5.1",
     "html-loader": "^3.1.2",
-    "marked": "^4.0.17"
+    "marked": "^4.0.17",
+    "sucrase": "^3.24.0"
   },
   "peerDependencies": {
     "react": ">=16.8.0",

src/CodeView.tsx

@@ -24,7 +24,6 @@ const CodeView = React.forwardRef((props: CodeViewProps, ref: React.Ref<HTMLDivE
     renderToolbar,
     onChange,
     beforeCompile,
-    compiler,
     afterCompile,
     ...rest
   } = props;
@@ -47,7 +46,6 @@ const CodeView = React.forwardRef((props: CodeViewProps, ref: React.Ref<HTMLDivE
               renderToolbar={renderToolbar}
               onChange={onChange}
               beforeCompile={beforeCompile}
-              compiler={compiler}
               afterCompile={afterCompile}
               editor={editor}
             />

src/Renderer.tsx

@@ -1,10 +1,12 @@
 /* eslint-disable @typescript-eslint/no-var-requires */
-import { useEffect, useState, useCallback, useRef } from 'react';
+import { useEffect, useState, useCallback } from 'react';
 import CodeIcon from '@rsuite/icons/Code';
 import classNames from 'classnames';
+import { transform as transformCode, Options } from 'sucrase';
 import CodeEditor from './CodeEditor';
 import Preview from './Preview';
 import canUseDOM from './utils/canUseDOM';
+import evalCode from './utils/evalCode';
 
 const React = require('react');
 const ReactDOM = require('react-dom');
@@ -37,38 +39,24 @@ export interface RendererProps extends Omit<React.HTMLAttributes<HTMLElement>, '
   };
 
   /**
-   * swc configuration
-   * https://swc.rs/docs/configuration/compilation
+   * https://github.com/alangpierce/sucrase#transforms
    */
-  transformOptions?: object;
+  transformOptions?: Options;
 
   /** Customize the rendering toolbar */
   renderToolbar?: (buttons: React.ReactNode) => React.ReactNode;
 
   /** Callback triggered after code change */
   onChange?: (code?: string) => void;
 
-  /**
-   * A compiler that transforms the code. Use swc.transformSync by default
-   * See https://swc.rs/docs/usage/wasm
-   */
-  compiler?: (code: string) => string;
-
   /** Executed before compiling the code */
   beforeCompile?: (code: string) => string;
 
   /** Executed after compiling the code */
   afterCompile?: (code: string) => string;
 }
 
-const defaultTransformOptions = {
-  jsc: {
-    parser: {
-      syntax: 'ecmascript',
-      jsx: true
-    }
-  }
-};
+const defaultTransformOptions: Options = { transforms: ['jsx'] };
 
 const Renderer = React.forwardRef((props: RendererProps, ref: React.Ref<HTMLDivElement>) => {
   const {
@@ -81,7 +69,6 @@ const Renderer = React.forwardRef((props: RendererProps, ref: React.Ref<HTMLDivE
     renderToolbar,
     onChange,
     beforeCompile,
-    compiler,
     afterCompile,
     ...rest
   } = props;
@@ -94,21 +81,6 @@ const Renderer = React.forwardRef((props: RendererProps, ref: React.Ref<HTMLDivE
     ...editorProps
   } = editor;
 
-  const [initialized, setInitialized] = useState(false);
-  const transfrom = useRef<any>(null);
-
-  useEffect(() => {
-    if (!canUseDOM) {
-      return;
-    }
-
-    import('@swc/wasm-web').then(async module => {
-      await module.default();
-      transfrom.current = module.transformSync;
-      setInitialized(true);
-    });
-  }, []);
-
   const [editable, setEditable] = useState(isEditable);
   const [hasError, setHasError] = useState(false);
   const [errorMessage, setErrorMessage] = useState(null);
@@ -139,18 +111,16 @@ const Renderer = React.forwardRef((props: RendererProps, ref: React.Ref<HTMLDivE
       };
 
       try {
-        const statement = dependencies
-          ? Object.keys(dependencies).map(key => `var ${key}= dependencies.${key};`)
-          : [];
-
         const beforeCompileCode = beforeCompile?.(pendCode) || pendCode;
 
         if (beforeCompileCode) {
-          const { code: compiledCode } = compiler
-            ? compiler(beforeCompileCode)
-            : transfrom.current?.(beforeCompileCode, transformOptions);
+          const { code: compiledCode } = transformCode(beforeCompileCode, transformOptions);
 
-          eval(`${statement.join('\n')} ${afterCompile?.(compiledCode) || compiledCode}`);
+          evalCode(afterCompile?.(compiledCode) || compiledCode, {
+            React,
+            ReactDOM,
+            ...dependencies
+          });
         }
       } catch (err) {
         console.error(err);
@@ -159,26 +129,22 @@ const Renderer = React.forwardRef((props: RendererProps, ref: React.Ref<HTMLDivE
         ReactDOM.render = originalRender;
       }
     },
-    [code, dependencies, beforeCompile, compiler, transformOptions, afterCompile]
+    [code, dependencies, beforeCompile, transformOptions, afterCompile]
   );
 
   useEffect(() => {
-    if (initialized) {
-      executeCode(code);
-    }
-  }, [initialized, code, executeCode]);
+    executeCode(code);
+  }, [code, executeCode]);
 
   const handleCodeChange = useCallback(
     (code?: string) => {
       setHasError(false);
       setErrorMessage(null);
       onChange?.(code);
 
-      if (initialized) {
-        executeCode(code);
-      }
+      executeCode(code);
     },
-    [executeCode, initialized, onChange]
+    [executeCode, onChange]
   );
 
   const codeButton = (
@@ -197,7 +163,7 @@ const Renderer = React.forwardRef((props: RendererProps, ref: React.Ref<HTMLDivE
     </button>
   );
 
-  const showCodeEditor = editable && code && initialized;
+  const showCodeEditor = editable && code;
 
   return (
     <div className="rcv-container" {...rest} ref={ref}>

src/utils/evalCode.ts

@@ -0,0 +1,7 @@
+const evalCode = (code, scope) => {
+  const scopeKeys = Object.keys(scope);
+  const scopeValues = scopeKeys.map(key => scope[key]);
+  return new Function(...scopeKeys, code)(...scopeValues);
+};
+
+export default evalCode;