josonify

server/util/jsonify.ts

@@ -0,0 +1,134 @@
+import { every, isString } from "lodash-es";
+import { symbol } from "zod";
+
+type JsonifiableLite =
+    string | number | boolean | bigint | null | undefined |
+    Date | ArrayBuffer | SharedArrayBuffer | ArrayBufferView |
+    JsonifiableLite[] | { [key: string]: JsonifiableLite };
+
+export type Jsonifiable =
+    JsonifiableLite |
+    Jsonifiable[] |
+    Map<JsonifiableLite, Jsonifiable> |
+    Set<Jsonifiable> |
+    { jsonify(): Jsonifiable } |
+    { [key: string]: Jsonifiable };
+
+export type Jsonified<T extends Jsonifiable> =
+    T extends string ? string :
+    T extends number ? number :
+    T extends boolean ? boolean :
+    T extends bigint ? string :
+    T extends null ? null :
+    T extends undefined ? undefined :
+    T extends Date ? string :
+    T extends ArrayBuffer ? string :
+    T extends SharedArrayBuffer ? string :
+    T extends ArrayBufferView ? string :
+    T extends (infer K extends Jsonifiable)[] ? Jsonified<K>[] :
+    T extends Map<infer K extends Jsonifiable, infer V extends Jsonifiable> ? (
+        K extends string ? { [key in string]: Jsonified<V> } : [Jsonified<K>, Jsonified<V>][]) :
+    T extends Set<infer V extends Jsonifiable> ? Jsonified<V>[] :
+    T extends object ? (
+        T extends { jsonify(): infer V extends Jsonifiable } ? Jsonified<V> : //HACK: jsonify()는 Jsonified여야 함
+        {[key in keyof T]: Jsonified<T[key]>}): //FIXME: keyof T에 symbol을 받을 수 없어야 함
+    T extends unknown ? unknown :
+    never;
+
+
+/**
+ * Convert any object to JSON-safe object
+ */
+export function jsonify<T extends Jsonifiable>(item: T): Jsonified<T> {
+    if (typeof item === 'string' || typeof item === 'number' || typeof item === 'boolean') {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return item as any;
+    }
+
+    if (typeof item === 'bigint') {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return item.toString() as any;
+    }
+
+    if (item === undefined || item === null) {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return item as any;
+    }
+
+    if (item instanceof Date) {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return item.toISOString() as any;
+    }
+
+    if (item instanceof ArrayBuffer || item instanceof SharedArrayBuffer) {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return Buffer.from(item).toString('base64') as any;
+    }
+
+    if (ArrayBuffer.isView(item)) {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return Buffer.from(item.buffer, item.byteOffset, item.byteLength).toString('base64') as any;
+    }
+
+    if (Array.isArray(item)) {
+        //HACK: depth hack
+        const result: Jsonified<string>[] = [];
+        for (const v of item) {
+            result.push(jsonify(v as string) as Jsonified<string>);
+        }
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return result as any;
+    }
+
+    if (item instanceof Map) {
+        //HACK: depth hack
+
+        const onlyStringKey = every(item.keys, isString);
+        if (onlyStringKey) {
+            const result: { [key: string]: Jsonified<string> } = {};
+            for (const [k, v] of item.entries()) {
+                result[k as string] = jsonify(v as string) as Jsonified<string>;
+            }
+            // eslint-disable-next-line @typescript-eslint/no-explicit-any
+            return result as any;
+        }
+
+        const result: [Jsonified<string>, Jsonified<string>][] = [];
+        for (const [k, v] of item.entries()) {
+            result.push([jsonify(k as string), jsonify(v as string)] as [Jsonified<string>, Jsonified<string>]);
+        }
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return result as any;
+    }
+
+    if (item instanceof Set) {
+        const result: Jsonified<string>[] = [];
+        for (const v of item.values()) {
+            result.push(jsonify(v as string) as Jsonified<string>);
+        }
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return result as any;
+    }
+
+    if (typeof item === 'object') {
+        if (typeof (item as { jsonify(): unknown }).jsonify === 'function') {
+            // eslint-disable-next-line @typescript-eslint/no-explicit-any
+            return (item as { jsonify(): unknown }).jsonify() as any;
+        }
+
+        const result: { [key: string]: Jsonified<string> } = {};
+        for (const [k, v] of Object.entries(item)) {
+            if (typeof k !== 'string') {
+                continue;
+            }
+            if (typeof v === 'function') {
+                continue;
+            }
+            result[k] = jsonify(v as string) as Jsonified<string>;
+        }
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        return result as any;
+    }
+
+    throw new Error(`jsonify: invalid type ${typeof item}`);
+}