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devonzuegel/extend-interface.ts

Created June 18, 2017 00:27
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extend-interface.ts
interface Foo {
bar: string|number
}
interface Baz extends Foo {
bar: string
}
const qux: Foo = {bar: 1} // Good
const corg: Baz = {bar: 1} // TypeError: Types of property 'bar' are incompatible
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