/
Headers.ts
120 lines (98 loc) · 2.89 KB
/
Headers.ts
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(globalThis => {
globalThis.Headers = class {
private readonly h: Map<string, string[]> = new Map();
immutable = false;
constructor(init?: HeadersInit) {
if (init === null) {
throw new TypeError('HeadersInit must not be null');
}
if (init) {
if (Array.isArray(init)) {
init.forEach(entry => {
if (entry.length !== 2) {
throw new TypeError('HeadersInit must be an array of 2-tuples');
}
this.addValue(entry[0], entry[1]);
});
} else {
if (init instanceof Headers) {
for (const [key, value] of init) {
this.addValue(key, value);
}
return;
}
if (typeof init !== 'object') {
throw new TypeError('HeadersInit must be an object or an array of 2-tuples');
}
Object.entries(init).forEach(([key, value]) => {
this.addValue(key, value);
});
}
}
}
private addValue(name: string, value: string) {
name = name.toLowerCase();
value = String(value);
const values = this.h.get(name);
if (values) {
values.push(value);
} else {
this.h.set(name, [value]);
}
}
append(name: string, value: string) {
if (this.immutable) {
throw new TypeError('Headers are immutable');
}
name = name.toLowerCase();
this.addValue(name, value);
}
delete(name: string) {
if (this.immutable) {
throw new TypeError('Headers are immutable');
}
name = name.toLowerCase();
this.h.delete(name);
}
*entries(): IterableIterator<[string, string]> {
const sorted = [...this.h.entries()].sort(([a], [b]) => a.localeCompare(b));
for (const [key, values] of sorted) {
yield [key, values.join(', ')];
}
}
get(name: string): string | null {
name = name.toLowerCase();
return this.h.get(name)?.join(', ') || null;
}
has(name: string): boolean {
name = name.toLowerCase();
return this.h.has(name);
}
keys(): IterableIterator<string> {
return this.h.keys();
}
set(name: string, value: string) {
if (this.immutable) {
throw new TypeError('Headers are immutable');
}
name = name.toLowerCase();
value = String(value);
this.h.set(name, [value]);
}
*values(): IterableIterator<string> {
for (const [, values] of this.h) {
for (const value of values) {
yield value;
}
}
}
forEach(callbackfn: (value: string, key: string, parent: Headers) => void, thisArg?: any) {
for (const [key, value] of this.entries()) {
callbackfn.call(thisArg, value, key, this);
}
}
[Symbol.iterator](): IterableIterator<[string, string]> {
return this.entries();
}
};
})(globalThis);