Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Parsing tsconfig.json with support for extra commas

See original GitHub issue

package.json

  "dependencies": {
    "ts-node": "^6.1.1",
    "tsconfig-paths": "^3.4.0",
    "typescript": "^2.9.2"
  },

run command ts-node -r tsconfig-paths/register.js test.ts

C:\Users\Cat\Desktop\toy-ts-node\node_modules\tsconfig-paths\lib\tsconfig-loader.js:72
    var config = JSON.parse(cleanedJson);
                      ^
SyntaxError: Unexpected token } in JSON at position 305
    at JSON.parse (<anonymous>)
    at loadTsconfig (C:\Users\Cat\Desktop\toy-ts-node\node_modules\tsconfig-paths\lib\tsconfig-loader.js:72:23)
    at loadSyncDefault (C:\Users\Cat\Desktop\toy-ts-node\node_modules\tsconfig-paths\lib\tsconfig-loader.js:27:18)
    at tsConfigLoader (C:\Users\Cat\Desktop\toy-ts-node\node_modules\tsconfig-paths\lib\tsconfig-loader.js:13:22)
    at Object.configLoader (C:\Users\Cat\Desktop\toy-ts-node\node_modules\tsconfig-paths\lib\config-loader.js:27:22)
    at Object.register (C:\Users\Cat\Desktop\toy-ts-node\node_modules\tsconfig-paths\lib\register.js:10:46)
    at Object.<anonymous> (C:\Users\Cat\Desktop\toy-ts-node\node_modules\tsconfig-paths\register.js:1:15)
    at Module._compile (internal/modules/cjs/loader.js:654:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:665:10)
    at Module.load (internal/modules/cjs/loader.js:566:32)

I really use the command cross-env TS_NODE_PROJECT=./tool/tsconfig.json && ts-node -r tsconfig-paths/register ./node_modules/webpack/bin/webpack.js --config ./tool/config.webpack.dev.ts

cross-env TS_NODE_PROJECT=./tool/tsconfig.json && node -r tsconfig-paths/register webpack --config ./tool/config.webpack.dev.ts

I don’t know how to use it.

Issue Analytics

State:
Created 5 years ago
Reactions:2
Comments:16 (15 by maintainers)

Top GitHub Comments

2reactions

ZSkycatcommented, Jun 20, 2018

I know why.because my tsconfig.json uses jsonc. https://github.com/TypeStrong/ts-node/issues/409#issuecomment-398583581

But, tsc support jsonc. It would be better to have tsconfig-paths support jsonc.

{
    "compilerOptions": {
        "rootDir": ".",
        "outDir": "../dist/tool",
        "target": "esnext",
        "module": "commonjs",
        "moduleResolution": "node",
        "sourceMap": true,
        "strict": true,
        "types": ["node"],
    },
    "include": [
        "./**/*",
    ],
}

1reaction

JakobJingleheimercommented, Jul 28, 2018

@jonaskello done 🙂

Top Results From Across the Web

Can you use a trailing comma in a JSON object?

No. The JSON spec, as maintained at http://json.org, does not allow trailing commas. From what I've seen, some parsers may silently allow them...

tsconfig.json isn't strict JSON, what now? : r/typescript - Reddit

Any tools that are "doing it right" shouldn't be parsing the config file themselves, so I'd say go nuts with comments and trailing...

JSON - JavaScript - MDN Web Docs

The JSON object contains methods for parsing JavaScript Object Notation ... Property names must be double-quoted strings; trailing commas are forbidden.

JSON editing in Visual Studio Code

The mode also accepts trailing commas, but they are discouraged and the editor ... The JSON support shipped with VS Code supports all...

JSON with Commas and Comments - Hacker News

Anything with support for machine-readable schemas, validation, and robust ... ruby's JSON.parse accepts comments (but not trailing commas) ...