chore(@vant/cli): 修复vue-jest生成sourcemap导致jest生成覆盖率失败

[ChangeHow]

BUG_REPORT:

使用@vant/cli迁移项目运行yarn test命令提示如下错误

 FAIL  src/price-label/test/index.spec.js
  ● Test suite failed to run

    /Users/chenzihao/Desktop/playground/vis-ui/vant-cli-migrate/src/price-label/components/price-label.vue: don't know how to turn this value into a node

      at valueToNode (../../vant/packages/vant-cli/node_modules/@babel/types/lib/converters/valueToNode.js:87:9)
      at Object.valueToNode (../../vant/packages/vant-cli/node_modules/@babel/types/lib/converters/valueToNode.js:81:58)
      at Object.exit (../../vant/packages/vant-cli/node_modules/istanbul-lib-instrument/dist/visitor.js:638:30)
      at PluginPass.exit (../../vant/packages/vant-cli/node_modules/babel-plugin-istanbul/lib/index.js:158:38)
      at newFn (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/visitors.js:179:21)
      at NodePath._call (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/path/context.js:55:20)
      at NodePath.call (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/path/context.js:42:17)
      at NodePath.visit (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/path/context.js:99:8)
      at TraversalContext.visitQueue (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/context.js:112:16)
      at TraversalContext.visitSingle (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/context.js:84:19)
      at TraversalContext.visit (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/context.js:140:19)
      at Function.traverse.node (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/index.js:84:17)
      at traverse (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/traverse/lib/index.js:66:12)
      at transformFile (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/core/lib/transformation/index.js:107:29)
          at transformFile.next (<anonymous>)
      at run (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/core/lib/transformation/index.js:35:12)
          at run.next (<anonymous>)
      at transform (../../vant/packages/vant-cli/node_modules/@jest/transform/node_modules/@babel/core/lib/transform.js:27:41)
          at transform.next (<anonymous>)
      at evaluateSync (../../vant/packages/vant-cli/node_modules/gensync/index.js:244:28)
      at sync (../../vant/packages/vant-cli/node_modules/gensync/index.js:84:14)
      at ScriptTransformer._instrumentFile (../../vant/packages/vant-cli/node_modules/@jest/transform/build/ScriptTransformer.js:388:46)

经过排查，发现是vue-jest为了测试方便在编码过程中为代码添加了source-map代码，但是在jest@25.x之后默认也会添加上source-map代码。

解决方案

升级vue-jest@4.0.0-rc.0，在这个版本中，去掉了vue-jest添加source-map的逻辑

相关issue

error: "don't know how to turn this value into a node" when using code coverage
[BREAKING CHANGE] remove inline source-map on process() output

[codecov-commenter]

Codecov Report

Merging #7188 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #7188   +/-   ##
=======================================
  Coverage   91.04%   91.04%           
=======================================
  Files         177      177           
  Lines        4837     4837           
  Branches      291      291           
=======================================
  Hits         4404     4404           
  Misses        397      397           
  Partials       36       36           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 49e9275...a2b9b9d. Read the comment docs.