chore(mp): improve error messages

packages/webpack-uni-mp-loader/lib/babel/global-component-traverse.js

+const path = require('path')
 const t = require('@babel/types')
 const babelTraverse = require('@babel/traverse').default
-
-const { parseComponents } = require('./util')
+const {
+  normalizePath
+} = require('@dcloudio/uni-cli-shared')
+const {
+  parseComponents
+} = require('./util')
 
 const uniI18n = require('@dcloudio/uni-cli-i18n')
 
 module.exports = function (ast, state = {}) {
   const imports = []
   let nodePath = false
+  try {
     babelTraverse(ast, {
       CallExpression (path) {
         const callee = path.node.callee
@@ -50,6 +56,12 @@ module.exports = function (ast, state = {}) {
     } else {
       state.components = []
     }
+  } catch (e) {
+    if (state.filename) {
+      console.error('at ' + normalizePath(path.relative(process.env.UNI_INPUT_DIR, state.filename)) + ':1')
+    }
+    throw e
+  }
   return {
     ast,
     state

packages/webpack-uni-mp-loader/lib/babel/scoped-component-traverse.js

+const path = require('path')
 const t = require('@babel/types')
 const babelTraverse = require('@babel/traverse').default
-
+const {
+  normalizePath
+} = require('@dcloudio/uni-cli-shared')
 const {
   parseComponents
 } = require('./util')
@@ -107,6 +110,7 @@ module.exports = function (ast, state = {
   components: [],
   options: {}
 }) {
+  try {
     babelTraverse(ast, {
       CallExpression (path) {
         const callee = path.node.callee
@@ -167,7 +171,8 @@ module.exports = function (ast, state = {
           }
         } else if (t.isClassDeclaration(declaration) &&
           declaration.decorators &&
-        declaration.decorators.length) { // export default @Component({components:{}}) class MyComponent extend Vue
+          declaration.decorators.length
+        ) { // export default @Component({components:{}}) class MyComponent extend Vue
           const componentDecorator = declaration.decorators[0]
           if (t.isCallExpression(componentDecorator.expression)) {
             const args = componentDecorator.expression.arguments
@@ -178,6 +183,12 @@ module.exports = function (ast, state = {
         }
       }
     })
+  } catch (e) {
+    if (state.filename) {
+      console.error('at ' + normalizePath(path.relative(process.env.UNI_INPUT_DIR, state.filename)) + ':1')
+    }
+    throw e
+  }
   return {
     ast,
     state

packages/webpack-uni-mp-loader/lib/main-new.js

@@ -92,12 +92,15 @@ createPage(Page)
         components
       }
     } = traverse(parser.parse(content, getBabelParserOptions()), {
+      filename: this.resourcePath,
       components: []
     })
 
     const babelLoader = findBabelLoader(this.loaders)
     if (!babelLoader) {
-      throw new Error(uniI18n.__('mpLoader.findFail', { 0: 'babel-loader' }))
+      throw new Error(uniI18n.__('mpLoader.findFail', {
+        0: 'babel-loader'
+      }))
     } else {
       addCreateApp(babelLoader)
     }

packages/webpack-uni-mp-loader/lib/script-new.js

@@ -83,7 +83,8 @@ module.exports = function (content, map) {
     }
   } = traverse(parser.parse(content, getBabelParserOptions()), {
     type,
-    components: []
+    components: [],
+    filename: this.resourcePath
   })
 
   const callback = this.async()
@@ -126,7 +127,9 @@ module.exports = function (content, map) {
 
     const babelLoader = findBabelLoader(this.loaders)
     if (!babelLoader) {
-      callback(new Error(uniI18n.__('mpLoader.findFail', { 0: 'babel-loader' })), content)
+      callback(new Error(uniI18n.__('mpLoader.findFail', {
+        0: 'babel-loader'
+      })), content)
     } else {
       addDynamicImport(babelLoader, resourcePath, dynamicImports)