[extends null] DTS Build Error, Syntax not yet supported

[cjh980402]

DTS Build start
DTS Build error
Error: Syntax not yet supported

> 1 | declare class MyClass extends null {
    |                               ^^^^

extends null is valid syntax but cannot build dts for extends null.

[ChelesteWang]

Can you elaborate and provide a duplicate demo？

[cjh980402]

src/index.ts

export class Myclass extends null {
    
}

tsup.config.json

{
  "clean": true,
  "dts": true,
  "entry": ["src/index.ts"],
  "format": ["cjs", "esm"],
  "minify": true,
  "sourcemap": true,
  "splitting": false,
  "target": "es2020",
  "tsconfig": "./tsconfig.json"
}

tsconfig.json

{
  "compilerOptions": {
    "strict": true,
    "alwaysStrict": true,
    "target": "es2020",
    "module": "commonjs",
    "declaration": true,
    "outDir": "./dist",
    "moduleResolution": "node",
    "forceConsistentCasingInFileNames": true,
    "esModuleInterop": true
  }
}

tsup error log

CLI Building entry: src/index.ts
CLI Using tsconfig: tsconfig.json
CLI tsup v5.11.6
CLI Using tsup config: /home/ubuntu/node-test/tsup.config.json
CLI Target: es2020
CLI Cleaning output folder
CJS Build start
ESM Build start
CJS ⚡️ Build success in 34ms
ESM ⚡️ Build success in 13ms
ESM dist/index.mjs     83.00 B
ESM dist/index.mjs.map 150.00 B
CJS dist/index.js     667.00 B
CJS dist/index.js.map 158.00 B
DTS Build start
DTS Build error
Error: Syntax not yet supported

> 1 | declare class Myclass extends null {
    |                               ^^^^
  2 | }
  3 |
  4 | export { Myclass };
    at convertExpression (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:7370:15)
    at DeclarationScope.convertHeritageClauses (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:7718:32)
    at Transformer.convertClassOrInterfaceDeclaration (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:8037:15)
    at Transformer.convertStatement (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:7979:23)
    at new Transformer (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:7936:16)
    at convert (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:7927:27)
    at Object.transform (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:8198:29)
    at transformFile (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:8268:46)
    at Object.writeFile (/home/ubuntu/node-test/node_modules/tsup/dist/rollup.js:8289:25)
    at Object.writeFile (/home/ubuntu/node-test/node_modules/typescript/lib/typescript.js:18191:14)

[ChelesteWang]

in your index.ts

export class Myclass extends null {
    
}

your class Should not be extends null , This is grammatically impermissible

[cjh980402]

extends null is valid syntax.
https://node.green/#ES2015-functions-class-extends-null

[egoist]

you should file an issue here: https://github.com/Swatinem/rollup-plugin-dts/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc

[cjh980402]

@egoist
This problem is solved in new version(4.1.0) of rollup-plugin-dts. (https://github.com/Swatinem/rollup-plugin-dts/blob/master/CHANGELOG.md)

Then, how can update rollup-plugin-dts version in tsup?

[github-actions]

🎉 This issue has been resolved in version 5.11.8 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀