When running .js files using allowJs, ts-node does not respect source maps in stack traces

Search Terms

I searched for allowJs and didn't see anything clearly related in either open or closed issues.

Expected Behavior

When executing transpiled .js files with a source map using allowJs, ts-node should work like node --enable-source-maps: stack traces should show the original source file/line number, not the transpiled file/line number.

Actual Behavior

The opposite: ts-node shows the transpiled file/line number. This only happens when allowJs is on - turning it off causes ts-node to work correctly.

Steps to reproduce the problem

Enable allowJs and sourceMaps in tsconfig.json. Transpile files using tsc. Run the transpiled files using ts-node. When an exception is thrown, note that the stack trace refers to the transpiled files and not the original .ts files. Compare to running with node --enable-source-maps, which does the right thing.

Minimal reproduction

I've put up a yarn 1 repo here showing this in action. After running yarn tsc, yarn ts-node dist/index.js produces:

% yarn ts-node dist/index.js
yarn run v1.22.17
$ /Users/adam/source-maps-issue/node_modules/.bin/ts-node dist/index.js
/Users/adam/source-maps-issue/dist/bad.js:5
    throw new Error("An exception");
          ^
Error: An exception
    at throwAnException (/Users/adam/source-maps-issue/dist/bad.js:5:11)
    at Object.<anonymous> (/Users/adam/source-maps-issue/dist/index.js:4:28)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Module.m._compile (/Users/adam/source-maps-issue/node_modules/ts-node/src/index.ts:1618:23)
    at Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Object.require.extensions.<computed> [as .js] (/Users/adam/source-maps-issue/node_modules/ts-node/src/index.ts:1621:12)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at phase4 (/Users/adam/source-maps-issue/node_modules/ts-node/src/bin.ts:649:14)

where as yarn node --enable-stack-traces dist/index.js produces:

% yarn node --enable-source-maps dist/index.js
yarn node v1.22.17
/Users/adam/source-maps-issue/src/bad.ts:2
  throw new Error("An exception");
        ^

Error: An exception
    at null.throwAnException (/Users/adam/source-maps-issue/src/bad.ts:2:9)
    at Object.<anonymous> (/Users/adam/source-maps-issue/src/index.ts:3:17)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47

Specifications

ts-node v10.9.1 node v16.13.0 compiler v4.8.4

tsconfig.json, if you're using one:

{
"extends": "@tsconfig/node16/tsconfig.json",
"compilerOptions": {

/* Emit */
"sourceMap": true,
"outDir": "./dist",

"allowJs": true
},
"include": [ "src" ],
}

package.json:

{
"name": "source-map-issue",
"version": "1.0.0",
"main": "index.js",
"private": true,
"author": "Adam Smith <adam@scenery.video>",
"license": "UNLICENSED",
"devDependencies": {
"@types/node": "16",
"ts-node": "^10.9.1",
"typescript": "^4.8.4"
}
}

Operating system and version: macOS 11.4

TypeStrong / ts-node