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util.ts
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util.ts
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type Encoders = Array<(s: string) => string>;
// Encode param names and values as URIComponent
export const encodeReserved = [encodeURIComponent, encodeURIComponent];
export const allowReserved = [encodeURIComponent, encodeURI];
function join(
value: object,
encoder: Encoders[0] = encodeURIComponent,
delimiter = ","
) {
if (Array.isArray(value)) {
return value.map(encoder).join(delimiter);
}
const flat = Object.entries(value).reduce(
(flat, entry) => [...flat, ...entry],
[] as any
);
return flat.map(encoder).join(delimiter);
}
/**
* Creates a tag-function to encode template strings with the given encoders.
*/
export function encode(encoders: Encoders, delimiter = ",") {
const q = (v: any, i: number) => {
const encoder = encoders[i % encoders.length];
if (typeof v === "undefined") {
return "";
}
if (typeof v === "object") {
return join(v, encoder, delimiter);
}
return encoder(String(v));
};
return (strings: TemplateStringsArray, ...values: any[]) => {
return strings.reduce((prev, s, i) => {
return `${prev}${s}${q(values[i], i)}`;
}, "");
};
}
export function simple(delimiter = ",") {
return (
param: unknown[] | Record<string, unknown>,
encoders = encodeReserved
) => {
return join(param, encoders[1], delimiter);
};
}
/**
* Separate array values by the given delimiter.
*/
export function form(delimiter = ",") {
return (params: Record<string, any>, encoders = encodeReserved) =>
Object.entries(params)
.filter(([, value]) => value !== undefined)
.map(([name, value]) => encode(encoders, delimiter)`${name}=${value}`)
.join("&");
}
/**
* Deeply remove all properties with undefined values.
*/
export function stripUndefined<T>(obj: T) {
return obj && JSON.parse(JSON.stringify(obj));
}
export function joinUrl(...parts: Array<string | undefined>) {
return parts
.filter(Boolean)
.map((s, i) => (i === 0 ? s : s!.replace(/^\/+/, "")))
.map((s, i, a) => (i === a.length - 1 ? s : s!.replace(/\/+$/, "")))
.join("/");
}