480b73915f
* Improve excess property checking for intersections
Still a draft, the implementation needs improvement
* Use mutable isIntersection in checkTypeRelatedTo
This makes parameter lists a lot shorter. Seems like a slight
improvement, although I can revert if I change my mind.
* Fix semicolon lint
* Remove TODOOOO
* Revert "Use mutable isIntersection in checkTypeRelatedTo"
This reverts commit b8dccff2a2.
64 lines
1.5 KiB
TypeScript
64 lines
1.5 KiB
TypeScript
interface Settings {
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timeout?: number;
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onError?(): void;
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}
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function getDefaultSettings() {
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return { timeout: 1000 };
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}
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interface CtorOnly {
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new(s: string): { timeout: 1000 }
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}
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function doSomething(settings: Settings) { /* ... */ }
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// forgot to call `getDefaultSettings`
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doSomething(getDefaultSettings);
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doSomething(() => ({ timeout: 1000 }));
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doSomething(null as CtorOnly);
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doSomething(12);
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doSomething('completely wrong');
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doSomething(false);
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// this is an oddly popular way of defining settings
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// this example is from services/textChanges.ts
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type ConfigurableStart = { useStart?: boolean }
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type ConfigurableEnd = { useEnd?: boolean }
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type ConfigurableStartEnd = ConfigurableStart & ConfigurableEnd
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interface InsertOptions {
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prefix?: string
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suffix?: string
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}
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type ChangeOptions = ConfigurableStartEnd & InsertOptions;
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function del(options: ConfigurableStartEnd = {},
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error: { error?: number } = {}) {
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let changes: ChangeOptions[];
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changes.push(options);
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changes.push(error);
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}
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class K {
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constructor(s: string) { }
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}
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// Ctor isn't a weak type because it has a construct signature
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interface Ctor {
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new (s: string): K
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n?: number
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}
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let ctor: Ctor = K
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type Spoiler = { nope?: string }
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type Weak = {
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a?: number
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properties?: {
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b?: number
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}
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}
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declare let propertiesWrong: {
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properties: {
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wrong: string
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}
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}
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let weak: Weak & Spoiler = propertiesWrong
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