Env：win10 1909
Node.js：both v8.11.4 and v12.13.1
When I run 'npm run build'，there is a error as below:

Running "build:all:*" (build) task Warning: "var/arr.js" does not exist in the hypothetical file system! Use --force to continue. Aborted due to warnings. npm ERR! code ELIFECYCLE npm ERR! errno 3 npm ERR! jquery@4.0.0-pre build:npm install && grunt` npm ERR! Exit status 3 npm ERR! npm ERR! Failed at thejquery@4.0.0-pre build script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR! E:\npm_modules\npm_cache_logs\2019-11-22T14_45_16_106Z-debug.log

**then, I viewed the log**:13 verbose stack Error:jquery@4.0.0-pre build:npm install && grunt
13 verbose stack Exit status 3
13 verbose stack at EventEmitter. (D:\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:332:16)
13 verbose stack at EventEmitter.emit (events.js:210:5)
13 verbose stack at ChildProcess. (D:\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack at ChildProcess.emit (events.js:210:5)
13 verbose stack at maybeClose (internal/child_process.js:1021:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
14 verbose pkgidjquery@4.0.0-pre
15 verbose cwd E:\workspace\jquery
16 verbose Windows_NT 10.0.18363
17 verbose argv "D:\nodejs\node.exe" "D:\nodejs\node_modules\npm\bin\npm-cli.js" "run" "build"
18 verbose node v12.13.1
19 verbose npm v6.12.1
20 error code ELIFECYCLE
21 error errno 3
22 errorjquery@4.0.0-pre build:npm install && grunt
22 error Exit status 3
23 error Failed at thejquery@4.0.0-pre build script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 3, true ]
`
I cant got what I can do.