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merge.ts
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merge.ts
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import type {KyHeadersInit, Options} from '../types/options.js';
import {isObject} from './is.js';
export const validateAndMerge = (...sources: Array<Partial<Options> | undefined>): Partial<Options> => {
for (const source of sources) {
if ((!isObject(source) || Array.isArray(source)) && typeof source !== 'undefined') {
throw new TypeError('The `options` argument must be an object');
}
}
return deepMerge({}, ...sources);
};
export const mergeHeaders = (source1: KyHeadersInit = {}, source2: KyHeadersInit = {}) => {
const result = new globalThis.Headers(source1 as HeadersInit);
const isHeadersInstance = source2 instanceof globalThis.Headers;
const source = new globalThis.Headers(source2 as HeadersInit);
for (const [key, value] of source.entries()) {
if ((isHeadersInstance && value === 'undefined') || value === undefined) {
result.delete(key);
} else {
result.set(key, value);
}
}
return result;
};
// TODO: Make this strongly-typed (no `any`).
export const deepMerge = <T>(...sources: Array<Partial<T> | undefined>): T => {
let returnValue: any = {};
let headers = {};
for (const source of sources) {
if (Array.isArray(source)) {
if (!Array.isArray(returnValue)) {
returnValue = [];
}
returnValue = [...returnValue, ...source];
} else if (isObject(source)) {
for (let [key, value] of Object.entries(source)) {
if (isObject(value) && key in returnValue) {
value = deepMerge(returnValue[key], value);
}
returnValue = {...returnValue, [key]: value};
}
if (isObject((source as any).headers)) {
headers = mergeHeaders(headers, (source as any).headers);
returnValue.headers = headers;
}
}
}
return returnValue;
};