tests/cases/compiler/weakType.ts(15,13): error TS2560: Value of type '() => { timeout: number; }' has no properties in common with type 'Settings'. Did you mean to call it?
tests/cases/compiler/weakType.ts(16,13): error TS2560: Value of type '() => { timeout: number; }' has no properties in common with type 'Settings'. Did you mean to call it?
tests/cases/compiler/weakType.ts(17,13): error TS2560: Value of type 'CtorOnly' has no properties in common with type 'Settings'. Did you mean to call it?
tests/cases/compiler/weakType.ts(18,13): error TS2559: Type '12' has no properties in common with type 'Settings'.
tests/cases/compiler/weakType.ts(19,13): error TS2559: Type '"completely wrong"' has no properties in common with type 'Settings'.
tests/cases/compiler/weakType.ts(20,13): error TS2559: Type 'false' has no properties in common with type 'Settings'.
tests/cases/compiler/weakType.ts(37,18): error TS2559: Type '{ error?: number; }' has no properties in common with type 'ChangeOptions'.
tests/cases/compiler/weakType.ts(62,5): error TS2322: Type '{ properties: { wrong: string; }; }' is not assignable to type 'Weak & Spoiler'.
  Type '{ properties: { wrong: string; }; }' is not assignable to type 'Weak'.
    Types of property 'properties' are incompatible.
      Type '{ wrong: string; }' has no properties in common with type '{ b?: number; }'.


==== tests/cases/compiler/weakType.ts (8 errors) ====
    interface Settings {
        timeout?: number;
        onError?(): void;
    }
    
    function getDefaultSettings() {
        return { timeout: 1000 };
    }
    interface CtorOnly {
        new(s: string): { timeout: 1000 }
    }
    
    function doSomething(settings: Settings) { /* ... */ }
    // forgot to call `getDefaultSettings`
    doSomething(getDefaultSettings);
                ~~~~~~~~~~~~~~~~~~
!!! error TS2560: Value of type '() => { timeout: number; }' has no properties in common with type 'Settings'. Did you mean to call it?
    doSomething(() => ({ timeout: 1000 }));
                ~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2560: Value of type '() => { timeout: number; }' has no properties in common with type 'Settings'. Did you mean to call it?
    doSomething(null as CtorOnly);
                ~~~~~~~~~~~~~~~~
!!! error TS2560: Value of type 'CtorOnly' has no properties in common with type 'Settings'. Did you mean to call it?
    doSomething(12);
                ~~
!!! error TS2559: Type '12' has no properties in common with type 'Settings'.
    doSomething('completely wrong');
                ~~~~~~~~~~~~~~~~~~
!!! error TS2559: Type '"completely wrong"' has no properties in common with type 'Settings'.
    doSomething(false);
                ~~~~~
!!! error TS2559: Type 'false' has no properties in common with type 'Settings'.
    
    // this is an oddly popular way of defining settings
    // this example is from services/textChanges.ts
    type ConfigurableStart = { useStart?: boolean }
    type ConfigurableEnd = { useEnd?: boolean }
    type ConfigurableStartEnd = ConfigurableStart & ConfigurableEnd
    interface InsertOptions {
        prefix?: string
        suffix?: string
    }
    type ChangeOptions = ConfigurableStartEnd & InsertOptions;
    
    function del(options: ConfigurableStartEnd = {},
                 error: { error?: number } = {}) {
        let changes: ChangeOptions[];
        changes.push(options);
        changes.push(error);
                     ~~~~~
!!! error TS2559: Type '{ error?: number; }' has no properties in common with type 'ChangeOptions'.
    }
    
    class K {
        constructor(s: string) { }
    }
    // Ctor isn't a weak type because it has a construct signature
    interface Ctor {
        new (s: string): K
        n?: number
    }
    let ctor: Ctor = K
    
    type Spoiler = { nope?: string }
    type Weak = {
        a?: number
        properties?: {
            b?: number
        }
    }
    declare let unknown: {
        properties: {
            wrong: string
        }
    }
    let weak: Weak & Spoiler = unknown
        ~~~~
!!! error TS2322: Type '{ properties: { wrong: string; }; }' is not assignable to type 'Weak & Spoiler'.
!!! error TS2322:   Type '{ properties: { wrong: string; }; }' is not assignable to type 'Weak'.
!!! error TS2322:     Types of property 'properties' are incompatible.
!!! error TS2322:       Type '{ wrong: string; }' has no properties in common with type '{ b?: number; }'.
    
    