本文介绍了Angular CLI - Typescript 抛出:无法读取未定义的属性“长度"的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用 ng serve 在 angular 4 项目中运行，但出现错误
I run in angular 4 project with ng serve and i get error
Cannot read property 'length' of undefined
但我的项目中没有任何属性长度..
but I don't have any property length in my project..
完整错误
Your global Angular CLI version (1.2.1) is greater than your local
version (1.1.3). The local Angular CLI version is used.
To disable this warning use "ng set --global warnings.versionMismatch=false".
Cannot read property 'length' of undefined
TypeError: Cannot read property 'length' of undefined
at createSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:15457:109)
at parseSourceFileWorker (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:15389:26)
at Object.parseSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:15338:26)
at Object.createSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:15192:29)
at VirtualFileStats.getSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\@ngtools\webpack\src\compiler_host.js:66:35)
at WebpackCompilerHost.getSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\@ngtools\webpack\src\compiler_host.js:213:38)
at findSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:67909:29)
at processImportedModules (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:68056:25)
at findSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:67937:17)
at processImportedModules (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:68056:25)
at findSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:67937:17)
at processSourceFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:67840:27)
at processRootFile (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:67728:13)
at E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:67018:60
at Object.forEach (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:1449:30)
at Object.createProgram (E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master\node_modules\typescript\lib\typescript.js:67018:16)
PS E:\פרוייקטים\פרוייקטים קיץ\Angular 4\Youtube Channel Angular Firebase\full project of the instructor github\angular-firestarter-master>
package.json
package.json
{
"name": "firestarter",
"version": "0.0.0",
"license": "MIT",
"scripts": {
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "^4.2.4",
"@angular/common": "^4.2.4",
"@angular/compiler": "^4.2.4",
"@angular/core": "^4.2.4",
"@angular/forms": "^4.2.4",
"@angular/http": "^4.2.4",
"@angular/platform-browser": "^4.2.4",
"@angular/platform-browser-dynamic": "^4.2.4",
"@angular/platform-server": "^4.2.4",
"@angular/router": "^4.2.4",
"@types/lodash": "^4.14.67",
"angularfire2": "^4.0.0-rc.1",
"core-js": "^2.4.1",
"firebase": "^4.1.3",
"lodash": "^4.17.4",
"rxjs": "^5.4.1",
"zone.js": "^0.8.12"
},
"devDependencies": {
"@angular/cli": "^1.1.3",
"@angular/compiler-cli": "^4.2.4",
"@types/jasmine": "2.5.53",
"@types/node": "~8.0.4",
"codelyzer": "~3.1.1",
"jasmine-core": "~2.6.4",
"jasmine-spec-reporter": "~4.1.1",
"karma": "~1.7.0",
"karma-chrome-launcher": "~2.2.0",
"karma-cli": "~1.0.1",
"karma-coverage-istanbul-reporter": "^1.3.0",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.1.2",
"ts-node": "~3.1.0",
"tslint": "~5.4.3",
"typescript": "=2.3.4"
}
}
推荐答案
您可能缺少 typescript 正在尝试处理的一个或多个文件.要找出您缺少哪个文件，只需添加
You might be missing one or more files that typescript is trying to process. To find out which file you are missing just add
console.log(文件名);
在 node_modules/typescript/lib/typescript.js 文件中 createSourceFile 函数的开始处.
at the starting of the createSourceFile function at node_modules/typescript/lib/typescript.js file.
这篇关于Angular CLI - Typescript 抛出:无法读取未定义的属性“长度"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！