Cannot find module log4js with TypeScript

[2277509846]

Use the import method to import log4js, execute the tsc command, and the error "Cannot find module 'log4js'" will be reported, but the compiled js file can run normally.

error TS2792: Cannot find module 'log4js'
index.ts:
`import log4js from "log4js";
// log4js.configure({
// appenders: { cheese: { type: "file", filename: "cheese.log" } },
// categories: { default: { appenders: ["cheese"], level: "error" } }
// });

const logger = log4js.getLogger();
logger.level = "debug";
logger.debug("Some debug messages");`

[lamweili]

It seems that ts-node works for runtime. But tsc fails to build.

You can download this: test.zip
Unzip and run the following commands within the folder:

npm i

npx ts-node test.ts # works

npx tsc test.ts     # fails

Switching to import * as log4js from 'log4js'; resolves the issue.

[2277509846]

How to write the tsconfig.json file so that tsc can find log4js.d.ts. This is the tsconfig.json file:
{
"compilerOptions": {
/* Language and Environment /
"target": "es2020", / Set the JavaScript language version for emitted JavaScript and include compatible library declarations. /
/ Modules /
"module": "es2020", / Specify what module code is generated. /
"outDir": "./dist", / Specify an output folder for all emitted files. /
"esModuleInterop": true, / Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. /
"forceConsistentCasingInFileNames": true, / Ensure that casing is correct in imports. /
/ Type Checking /
"strict": true, / Enable all strict type-checking options. */
"skipLibCheck": true
}
}

[lamweili]

I have included your tsconfig.json into replaced.zip.
Unzip and run the following commands within the folder:

npm i
npx tsc

Sorry, I'm not so familiar with TypeScript. But I don't have any errors.
Any where that I could be wrong?

EDITED: This is because the tsconfig.json contains comments which invalidated it and fallbacks to default configuration.

[2277509846]

It seems that these two configuration options cause the error.
{
"compilerOptions": {
"target": "es2015",// cause error
"module": "es2015",// cause error
"outDir": "./dist",
"esModuleInterop": true,
"forceConsistentCasingInFileNames": true,
"strict": true,
"skipLibCheck": true
}
}

[lamweili]

After removing the comments in tsconfig.json, both es2020 and es2015 (for target and module) have errors.

You will need to add "moduleResolution": "node".

es2015

  {
    "compilerOptions": {
      "target": "es2015",
      "module": "es2015",
      "outDir": "./dist",
      "esModuleInterop": true,
      "forceConsistentCasingInFileNames": true,
+     "moduleResolution": "node",
      "strict": true,
      "skipLibCheck": true
    }
  }

es2020

  {
    "compilerOptions": {
      "target": "es2020",
      "module": "es2020",
      "outDir": "./dist",
      "esModuleInterop": true,
      "forceConsistentCasingInFileNames": true,
+     "moduleResolution": "node",
      "strict": true,
      "skipLibCheck": true
    }
  }

[2277509846]

My problem has been solved. Thank you very much