fix(ExtractComputedReturns): use explicit Record type

[frangio]

This PR fixes the following errors I was seeing.

app/client/node_modules/@vue/runtime-core/dist/runtime-core.d.ts:437:20 - error TS2344: Type 'Function & T[key]["get"]' does not satisfy the constraint '(...args: any) => any'.
  Type 'Function' provides no match for the signature '(...args: any): any'.

437     } ? ReturnType<T[key]['get']> : ReturnType<T[key]>;
                       ~~~~~~~~~~~~~

app/client/node_modules/@vue/runtime-core/dist/runtime-core.d.ts:437:48 - error TS2344: Type 'T[key]' does not satisfy the constraint '(...args: any) => any'.
  Type 'T[keyof T]' is not assignable to type '(...args: any) => any'.
    Type 'T[string] | T[number] | T[symbol]' is not assignable to type '(...args: any) => any'.
      Type 'T[string]' is not assignable to type '(...args: any) => any'.

437     } ? ReturnType<T[key]['get']> : ReturnType<T[key]>;
                                                   ~~~~~~

[pikax]

Can you provide how to reproduce the error that you were seeing?

Can you add a test on the test-dts folder?

[frangio]

npm init -y
npm install vue@next typescript

tsconfig.json:

{
  "compilerOptions": {
    "target": "es2020",
    "module": "commonjs"
  }
}

index.ts:

import 'vue';

Compile with npx tsc.

---

Also in the TypeScript playground pasting the existing definition of ExtractComputedReturns.

Playground Link

[frangio]

I'm not really sure what test I should add. This type is an internal utility so it's not exported from the index file.

[runkids]

When i run script

tsc --target ESNext --module ES6 --outDir esm

I was seeing this error too.

> tsc --target ESNext --module ES6 --outDir esm

node_modules/@vue/runtime-core/dist/runtime-core.d.ts:437:20 - error TS2344: Type 'Function & T[key]["get"]' does not satisfy the constraint '(...args: any) => any'.
  Type 'Function' provides no match for the signature '(...args: any): any'.

437     } ? ReturnType<T[key]['get']> : ReturnType<T[key]>;
                       ~~~~~~~~~~~~~

node_modules/@vue/runtime-core/dist/runtime-core.d.ts:437:48 - error TS2344: Type 'T[key]' does not satisfy the constraint '(...args: any) => any'.
  Type 'T[keyof T]' is not assignable to type '(...args: any) => any'.
    Type 'T[string] | T[number] | T[symbol]' is not assignable to type '(...args: any) => any'.
      Type 'T[string]' is not assignable to type '(...args: any) => any'.

437     } ? ReturnType<T[key]['get']> : ReturnType<T[key]>;
                                                   ~~~~~~

typescript version: ^3.9.2

tsconfig.json:

{
  "compilerOptions": {
    "declaration": true,
    "esModuleInterop": true,
    "lib": [
      "esnext", "dom"
    ],
    "module": "commonjs",
    "moduleResolution": "node",
    "noEmitOnError": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "downlevelIteration": true,
    "outDir": "./dist",
    "types": [
      "node", "jest"
    ],
    "target": "es5",
    "typeRoots": [
      "./types",
      "./node_modules/@types"
    ]
  },
  "include": [
    "src/**/*"
  ]
}

[pikax]

Currently vue-next is not compatible with typescript 3.9

There's a PR open #1106

[yyx990803]

Should be fixed after #1106. Thanks for the PR though!