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24 lines
676 B
TypeScript
24 lines
676 B
TypeScript
// Loaded from https://deno.land/x/tinyhttp@0.1.18/extensions/res/append.ts
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import { Res } from '../../deps.ts'
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import { setHeader, getResponseHeader } from './headers.ts'
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export const append = <Response extends Res = Res>(res: Response) => (
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field: string,
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value: string | number | string[]
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): Response => {
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const prevVal = getResponseHeader<Res>(res)(field)
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let newVal = value
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if (prevVal && typeof newVal !== 'number' && typeof prevVal !== 'number') {
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newVal = Array.isArray(prevVal)
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? prevVal.concat(newVal)
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: Array.isArray(newVal)
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? [prevVal].concat(newVal)
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: [prevVal, newVal]
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}
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setHeader(res)(field, newVal)
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return res
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}
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