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javascripttypescripttscts-node

Typescript not compiling correctly to commonjs/es2015

I'm running Node v14.5.0. I'm using ts-node-dev in dev enviroment

Trying to compile to JS always gives an error.

At first, I tried with this tsconfig:

"target": "es5",
"module": "commonjs"
"outDir": "./dist",
"rootDir": "./src"

But when I run tsc and node dist/app.js I get the following error:

UnhandledPromiseRejectionWarning: D:\Dev\src\entity\BaseEntity.ts:1
import {
^^^^^^

SyntaxError: Cannot use import statement outside a module

After doing some research, I found that I should tell Node to use Modules adding "type": "module" to package.json. After that, the error changed to:

Object.defineProperty(exports, "__esModule", { value: true });
                      ^

ReferenceError: exports is not defined

Doing some more research I tried several different things like:

  • Changing tsconfig from "module": "commonjs" to "module": "es2015"

    This also causes to be unable to run ts-node-dev. It throws the error: Cannot use import statement outside a module.

  • Adding to tsconfig "moduleResolution": "node"

    With this and "es2015" module tsconfig I'm requered in all my typescript imports to use the .JS extension. Example: import { foo } from '../bar.js, otherwise throws an error like: Error [ERR_MODULE_NOT_FOUND]: Cannot find module D:/.... And of course, prevents me from using ts-node-dev as throws an error described above.

Solution

  • The problem was in the ormconfig.js where my entities path was pointing to a .ts file instead of a .js.

    Solution:

    entities: ['dist/entity/*.js'],
migrations: ['dist/migration/**/*.js']