v0.5.0

Author: UmamiAppearance

cjs/your-function.cjs

@@ -134,7 +134,6 @@ const showDiff = (filename, source, code, diffOption, pluginName) => {
  * @license MIT
  */
 
-
 const yourFunction = (settings={}) => {
 
     if (!settings.fn) {
@@ -149,7 +148,7 @@ const yourFunction = (settings={}) => {
             : "your-function"
     };
 
-    const fnWrap = async (source, options) => {
+    const fnWrap = async (source, options, context) => {
 
         if (!filter(options.id)) return null;
 
@@ -172,20 +171,50 @@ const yourFunction = (settings={}) => {
                 // of diff and using the output to apply the changes
                 // to the source with the help of magic string. 
 
+                let error = false;
+                const errorCase = (e) => {
+                    error = true;
+                    let msg = "Automatic source map generation failed, or produced an inaccurate result. If you need a proper source map, you should provide it manually, otherwise you can ignore this message.";
+                    if (e) {
+                        msg = `${msg}\n___\n${e}`;
+                    }
+                    context.warn(msg);
+                };
+
                 const ms = new MagicString(source);
                 let i = 0;
 
                 for (const diff$1 of diff.diffChars(source, code)) {
 
                     if (diff$1.added) {
-                        ms.appendRight(i, diff$1.value);
-                    } else if (diff$1.removed) {
-                        ms.remove(i, i+=diff$1.count);
-                    } else {
+                        try {
+                            ms.appendRight(i, diff$1.value);
+                        } catch(e) {
+                            errorCase(e);
+                            break;
+                        }
+                    }
+                    
+                    else if (diff$1.removed) {
+                        try {
+                            ms.remove(i, i+=diff$1.count);
+                        } catch(e) {
+                            errorCase(e);
+                            break;
+                        }
+                    }
+                    
+                    else {
                         i += diff$1.count;
                     }
                 }
 
+                // Test if the code output of the magic string instance
+                // matches the output provided by the user 
+                if (!error && ms.toString() !== code) {
+                    errorCase();
+                }
+
                 map = ms.generateMap({ hires: true });
             }
         } else {
@@ -197,24 +226,26 @@ const yourFunction = (settings={}) => {
 
 
     if (settings.output) { 
-        plugin.renderChunk = async (source, chunk, outputOptions, meta) => {
+        plugin.renderChunk = async function(source, chunk, outputOptions, meta) {
             return await fnWrap(
                 source,
                 {
                     id: chunk.fileName,
                     chunk,
                     outputOptions,
                     meta
-                }
+                },
+                this
             );
         };
     }
 
     else {
-        plugin.transform = async (source, id) => {
+        plugin.transform = async function(source, id) {
             return await fnWrap(
                 source,
-                { id }
+                { id },
+                this
             );
         };
     }