优化js解析,更准确的把报错信息正确的输出

lib/compile-vue.js

@@ -111,7 +111,8 @@ export function parseJs(
   code = '',
   imports,
   { IS_MPA, currentPage, IS_ENTRY, DEPLOY_PATH, LEGACY_MODE } = {},
-  filename
+  filename,
+  linePatch = 0
 ) {
   let fixedStyle = ''
   let ASSETS_DIR = '/@/'
@@ -125,16 +126,21 @@ export function parseJs(
     code = Es.transformSync(code).code || ''
   } catch (e) {
     let err = e.errors.pop()
-    console.log('%s: %s', red('Uncaught SyntaxError'), err.text)
+    let lines = code.split('\n')
+
+    console.log('%s: %s', red('Uncaught SyntaxError'), red(err.text))
+    // 将上下文几行都打印出来
+    for (let i = err.location.line - 3; i <= err.location.line + 1; i++) {
       console.log(
         '  @ line %d: %s',
-      err.location.line,
-      cyan(err.location.lineText)
+        i + linePatch,
+        err.location.line === i + 1 ? red(lines[i]) : lines[i]
       )
+    }
     console.log(
       '  @ %s:%d:%d',
       blue(filename),
-      err.location.line,
+      err.location.line + linePatch - 1,
       err.location.column
     )
   }
@@ -283,6 +289,7 @@ export function compileVue(file, imports, options = {}) {
   let js = code.match(JS_EXP)
   let scss = [...code.matchAll(STYLE_EXP)]
   let html = code.match(HTML_EXP) || ['', '']
+  let linePatch = code.slice(0, js.index).split('\n').length // js起始行数修正
 
   let hash = md5(file)
   let scopeId = 'data-' + hash
@@ -317,9 +324,8 @@ export function compileVue(file, imports, options = {}) {
       isCustomElement
     }).code.replace('export function render', 'function render')
   } catch (err) {
-    // console.log(err)
-    let tmp = html[1].split('\n')
-    let line = tmp[err.loc?.start.line - 1]
+    let lines = html[1].split('\n')
+    let line = lines[err.loc?.start.line - 1]
 
     console.log('%s: %s', red('SyntaxError'), red(err.message))
     console.log(
@@ -360,7 +366,7 @@ function render(_ctx, _cache) {
     CACHE[file] = { changed: false, js, html }
   }
 
-  output += parseJs(js, imports, options, file).replace(
+  output += parseJs(js, imports, options, file, linePatch).replace(
     'export default {',
     `\n${
       options.LEGACY_MODE ? '' : SHEETS_DEF