lb4 export-api-def results in AssertionError [ERR_ASSERTION]: Trying to copy from a source that does not exist:

[oliverkarst]

Description / Steps to reproduce / Feature proposal

I would like to generate the openapi.json or a swagger definition in any kind. But templates are missing.

Current Behavior

$ lb4 export-api-def
? Project description: nma-services-swagger
? Project root directory: client-swagger
? Application class name: tests
? Select features to enable in the project Enable tslint, Enable prettier, Enable mocha, Enable loopbackBuild, Enable vs
code, Enable repositories, Enable services
events.js:183
throw er; // Unhandled 'error' event
^

AssertionError [ERR_ASSERTION]: Trying to copy from a source that does not exist: D:\Users\myname\AppData(Roaming)\npm\node_modules@loopback\cli\generators\project\templates***
at EditionInterface.exports.copy (D:\Users\myname\AppData(Roaming)\npm\node_modules@loopback\cli\node_modules\mem-fs-editor\lib\actions\copy.js:48:3)
at EditionInterface.module.exports [as copyTpl] (D:\Users\myname\AppData(Roaming)\npm\node_modules@loopback\cli\node_modules\mem-fs-editor\lib\actions\copy-tpl.js:29:8)
at AppGenerator.scaffold (D:\Users\myname\AppData(Roaming)\npm\node_modules@loopback\cli\lib\project-generator.js:195:13)
at AppGenerator.scaffold (D:\Users\myname\AppData(Roaming)\npm\node_modules@loopback\cli\generators\app\index.js:109:18)
at Object. (D:\Users\myname\AppData(Roaming)\npm\node_modules@loopback\cli\node_modules\yeoman-generator\lib\index.js:424:27)

Expected Behavior

a file is generated that contains the swagger / openapi definition.

[dhmlau]

@oliverkarst , the openapi definition will be available at http://localhost:3000/openapi.json after you started your application.

[raymondfeng]

We don't have export-api-def command for LoopBack 4 (yet). Running lb4 export-api-def assumes you try to create a LB4 app named as export-api-def.

[oliverkarst]

Thanks for your replies!

@raymondfeng I checked again the documentation and saw that maybe lb4 openapi can give me the result I would like to have https://loopback.io/doc/en/lb4/OpenAPI-generator.html

But same result here :-(

the model-template.ts.ejs is missing

here the terminal output

$ lb4 openapi
? Enter the OpenAPI spec url or file path: https://server-url/nma/nma-service/openapi.json
Loading https://gateway.hub-test.ose.db.de/nma/nma-service/openapi.json...
? Select controllers to be generated: [DistrictController] DistrictController, [PingController] PingController, [HomePageController] HomePageController
events.js:183
      throw er; // Unhandled 'error' event
      ^

_AssertionError [ERR_ASSERTION]: Trying to copy from a source that does not exist: D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\generators\openapi\templates\src\models\model-template.ts.ejs_
    at EditionInterface.exports.copy (D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\node_modules\mem-fs-editor\lib\actions\copy.js:48:3)
    at EditionInterface.module.exports [as copyTpl] (D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\node_modules\mem-fs-editor\lib\actions\copy-tpl.js:29:8)
    at OpenApiGenerator._generateModels (D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\generators\openapi\index.js:147:15)
    at OpenApiGenerator.scaffold (D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\generators\openapi\index.js:111:10)
    at Object.<anonymous> (D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\node_modules\yeoman-generator\lib\index.js:424:27)
    at D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\node_modules\run-async\index.js:25:25
    at new Promise (<anonymous>)
    at D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\node_modules\run-async\index.js:24:19
    at self.env.runLoop.add.completed (D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\node_modules\yeoman-generator\lib\index.js:425:13)
    at runCallback (timers.js:789:20)

[raymondfeng]

Hmm, there seems to be an issue to copy files on Windows, for example:

D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules\@loopback\cli\generators\openapi\templates\src\models\model-template.ts.ejs_

Can you check if such file exists? Maybe the file path is too deep?

[oliverkarst]

@raymondfeng: thanks for your fast reply. After check the file model-template.ts.ejs exists in
D:\Users\BKU\oliverkarst\AppData(Roaming)\npm\node_modules@loopback\cli\generators\openapi\templates\src\models

The path has a bit more than 130 length.
Do you have any ideas what I can do to use a shorter path that is not that deep to verify that is the problem?

[raymondfeng]

Can you try the following:

cd D:\temps
npm i @loopback/cli
node D:\temps\node_modules\@loopback\cli\bin\cli-main.js openapi

[oliverkarst]

The shorter path worked. Thanks so much.

[raymondfeng]

@oliverkarst I believe the issue is related to the path with () chars. See #1958